My number one question was what will happen if my “fertiliser” bucket runs dry. With your first answer you have showed me without intending haha. Thanks mate!
The main problem with this setup is the back pressure created by the hose-end sprinkler causes the venturi siphon to stop working. Water going in the wrong direction is not the problem. It can't go backward due to the spring and ball backflow device inside the right angle of the venturi. These venturi siphon devices work fine when there is no (or negligible) backpressure on the end of the hose. This means an impact sprinkler or similar won't work....in my experience.
Ναι έτσι είναι. Πιστεύω πως θα πρέπει να υπάρχει η ανάλογη διαφορά πίεσης και να εξασφαλίζεται ένα όριο ροής. Αυτο είναι και το κριτήριο για το μέγεθος του venturi. Εγώ δεν κατάφερα με το μικρότερο να έχω αναρρόφηση με παροχή 600lt /h
thanks for that it was the only video that showed me how to use my venturi, I got from China ($1.00) I was having problems getting it to suck but then I used a nozzle on the end of my hose and it's now all good, cheers mate.
In my area where i live we irrigate 100s of acres of ground crops, many irrigate their vinyards with drip. There are sozes of these up to 4" abailable, so sizing is important, we have a gauge on both inlet and outlet and need a pressure drop on outlet to syphon, i use these st my home orchard, veggie garden and ornamentals, i use the correct sizing for flow, for me i use the water meter to know flow/sizing.
Thanks heaps I was going to buy one of these but couldn't work out how to decipher the ratio of fertilizer you have solved that problem for me thanks heaps your video is very informative
@ChilliChump -Why doesn't water get out the suction pipe? Standard under the venturi in the connection cap of the suction pipe there will be a one-way-valve (just a piece of plastic with a spring). -No suction 2 possibilities: 1. as you said, reverse mounted venturi 2. oversized venturi: home use pipes are 1/2" and a 3/4 " or 1" venturi will get an insufficient pressure drop to create suction. Bigger is not better in this case.
The venturi has a check valve. There is probably a ball under the threaded-on, small hose barb. Without the check valve, it would in-fact flow backwards due to the pressure.
Hi Nicholas. I thought it did as well, but I had someone message me on s previous video I did on this saying that it was pushing water into the fertiliser resovoir. So I was just demonstrating that it couldn't really happen. I am guessing they either had the pipes in the wrong place or they had a faulty Venturi! Mine definitely has the check valve
Hi ChilliChump, thank you for the video. Could you confirm which part is the check valve is located? Is it a check ball with spring? I examined my barb fitting to the mixer pipe and didn’t see any. Maybe I missed it or lost it?
The check valve is definately meant to be there. I bought mine and it did not have the ball inside. I used a BB Gun ball in it and it works a treat. Also found that my hose addapter was restricting the flow which made the water go into the fertalizer instead the other way around. Hope this helps.
@@kothedarek I can see it being very likely to have parts missing! A lot of people don't conceptually grasp how check valves and venturies work and are used.
We basically did this experiment at secondary school in science showing how a y (off sided y connection? ) connection on a tap and hose can crush a petrol can.
I just tried this at home, the system works when it's not connected to my drip feed irrigation system, as soon as I connect it the mixer stops working. But everything else in your video at least helped me set it up and to do the math! ;-)
It’s too much back pressure from the drip system. I had the same problem. It depends on your water pressure and everyone has different water pressure. With mine, I had to set up two sprinklers connected to each other to make the outflow high enough to get the suction to work, otherwise it did run back into the fertilizer tank through the Venturi. My water pressure was just too high...
I have the exact problem being described, the system will not uptake with a sprinkler due to back pressure.. without a hose attachment it works fine, the Venturi is set up in the correct direction
Hi, I think that the problem in having the venturi not working is if the flow rate is too small. try your test again with the red dye, and just put a small flow through, restricted by your had sprayer.
There's a check ball in the pickup leg. If you remove the barb fitting you can kinda see it. You can alternately blow and suck on that fitting and feel it working.
It’s a question if I use a piece of glue and snipped off the tip of the hose they gave me do you think that’s probably where this ball was because that would probably explain why it’s blowing water through the sides, and instead of pulling it up through the siphon and that’s the question I’m having trouble with. I have it on the flow system as well but it was working at one point I know it’s not so I’m trying to figure out the pressure thing or the gravity thing if it’s too high up or too low down or if the pressure is wrong at one end or the other or if I just have to buy another siphon that has the ball in it.
Did some experiments using a 1/2in venturi siphon. Here are the results. Unable to get it to work with a 40m wall mounted Hozelock reel or a 20m hoze. Am only able to get it working with a 10m hoze
My garden hose was above the liquid fertilizer. So may be gravity was a reason for back flow . Thank you so much for this video . I’ll do a test again may be not now please since I’m totally into something else
Thank you for the video. It’s amazing! I have been trying the Venturi siphon for home gardening. I bought the siphon exact the same as the Amazon link in your video description. My only success is with a open-ended pipe. Once I connect any sprayer or sprinkler, the water flow backward to the mixer container. I didn’t see any check ball or spring when I examine its barb fitting to siphon pipe. Could someone confirm there is indeed a check ball or something in that? One last thing, this video is the only *home gardening* one that I saw in CZcams that has huge success with Venturi siphon. All others home gardening could only get it working with open ended pipe. Once a sprayer is attached, it flow backward. It’s also amazing that in the video the water won’t run backward even when the sprinkler is shut off. I never see that in other video. I wonder if it is because of using hozelock system?
I'm glad you enjoyed my video. The trick is to balance the pressure coming from your tap with the pressure at the sprinkler end. If the pressure is too much at the sprinkler side, then the Venturi won't work.
I'd guarantee that any issue priming the system with this set up is pressure related. I can get mine to run on my house pump but my submersible pump that goes up a hill to my market garden won't run it.
Thank you for this helpful video. This may be a stupid question, but if the total input is 360 ml for 5 liters of total flow and you needed to add 100 ml of fertilizer per 5 liters, then wouldn't you add the 100 ml to 260 ml of water to give a total of 360 ml rather than add 100 ml to 360 ml which would give you 460 ml and you'd have 100 ml left after 5 liters total flow?
Does it make a difference if you place the syphon container under the Venturi device, or on the same surface? Perhaps gravity is helping against the back flow with the container at higher elevation. 🤷🏻♂️
I'm late I know 😂 but the viewer probably unscrewed that barbed fitting from the venturi and screwed on there own pickup tube. You can't do that though cause as others have said there's a built in check valve in the barbed fitting. If there was absolutely no flow restriction it might work (i.e. you have no hose pipe attached to the outlet) otherwise you'll get back fed water.
Awesome. Thank you for the calculations walkthrough. What of hose disconnects are those? I’ve tried some from the local big box store but they don’t work well.
Hi there. I have 100 square metres of green house. It says I must use 50ml solution diluted in 5l of water. Clearly 5l is not enough to water the plants. Should I irrigate the plants with water at first then at the end apply the solution? If i put the house in a bucket with 50ml of solution do I need to add water into it to make it flow better? Wont it become super diluted if its also adding more water to the solution when irrigating?
I had that problem- what I found out if you connect it to the water supply it will happen, the Venturi has to be vertical or horizontal what as if it’s connected to the water supply the angle is incorrect - I finally used some pvc fitting to get it vertical and it works as it should
I have connected my Ventiri siphon exactly like your one. When I connected the venturi siphon to nothing, it sucked 100% (5:1). When I plugged the outlet to my drip irrigation system, no sucking. So I cannot use it.
You can't have a lot of back pressure, it fundamentally won't work if that's the case. So drippers will be a tough one because you would need a way to let out some of the pressure.
What’s the point of the calculation thing? Just put in the amount of fertilizer for the specific area, dilute it and pedal to metal until empty. Right?
Thank you ...very helpful.....have been wondering what ratio do I use for a 200 litre mix on number 5 and number 2 setting uaing the pressures you have
Dear ChilliChump, I need your kind opinion. This morning I ran the identical venturi siphon like yours on my drip irrigation line for my vegetable garden. Unfortunately it doesn't work! While it works very well with sprinkler irrigation like yours or with free hose, unfortunately with drip irrigation it starts well but then immediately freezes. I made several experiments by rotating the venturi siphon in all positions on 360 degrees and also removing the tap. Unfortunately nothing to do ... If I disconnect the pipe that brings the water to the drips, the venturi siphon works very well and is truly exceptional. The fertilizer liquid I put in is clean because it is filtered. This is water in which I dissolved my earthworm compost for 48 hours. Is the cause by any chance the back pressure generated by the small holes in the driplines? What can I do to solve this problem? Thank you for your answer. A strong hug Marco
@@ChilliChump let's say I have 50 drippers and these are the ones with rotatable heads, which have been opened up almost completely so that water doesn't drip from them, but it flows freely. Do you think it will still not work?
Because you need enough pressure that it will evenly flow through the 50 drippers...while not putting enough back pressure that the Venturi doesn't work
If there's a filter on the feed tube you couldn't use your own made feed because it might have too many particles to block it. If it is sucking up too much feed could you add a pin hole above the feed bottle so it would suck in some air as well as some feed. You'd have to experiment again. I'm just thinking of a more simpler way for countries that only have Chinese junk. America seems to be able to buy items that are made from longer lasting material, like plastics, metal that doesn't rust after one rainfall and the old type paint is the big one. It was so much better oil paint with the thinners in that were bad for the environment. Have the xylene and toluene paints been banned in Australia and America.
i have a durain farm and i already have the dripping system so i find this way is also good for fertiliser my Duran plant through the dripping system i have but i have a question if i have to install the fertiliser injection system before or after my filter system, pls advise :)
The item on the Amazon link is pretty sketchy. Both ends of the black pipe are male thread. One end needs to be female end so this wouldn't work for anybody unless you go by the right parts.
@@patrickbrideauful Hello, Gardena has a fertilizer attachment that works with drip systems and soaker hoses. I use it, works great. czcams.com/video/3kQQdZlnkrg/video.html
Hello, thanks for your videos. I am wondering how long did it take to suck that 0.5litre in your test scenario. I know it depends upon presure in the system but still would appreciate any input in this area. I am asking as I used Venturi for the first time on a weekend and after roughly 30 minutes it sucked appr. 3 litres of fertilizer. I thought initially it could suck much more fertilizer in 30 minutes. My Venturi was set on highest thruput number. Thanks, Peter
Thanks for prompt reply. Size is same as yours (at least from this visual comparison). As I was bit disappointed by sucking volume I used my aquamix from birchmaier
I tried using the Hozon Injector which is similar to the product you are using, but mine is much smaller. It will not work if I attach a watering head to the hose. An thing I add to the hose restricts the water too much and the syphon will not work. I see on amazon, there are Venturi siphons like yours in different diameters. Have you ever experiences problems like what I have described? What would be the advantage of a larger diameter verses a smaller diameter siphon?
I haven't had to use Venturi siphon with different diameters because the one I have works fine for my purposes. If you have a higher flow rate then a larger Venturi siphon would be needed. With a lower flow rate, a smaller siphon.
I have same problem diameter is 3/4 from the venturi and wall instalation is 1/2 and i doesnt want to work..so is there a rule same diameter of venturi and same in wall instalation or venturi must be smaller??Thanks
Make sure the water is flowing in the right direction (should be an arrow on the device indicating the flow). Also try reducing the pressure coming from your tap
Martin Hague I have the exact same issue... I bought a second one and got the same results. I even tried removing the spring from the check valve to see it that would help and nothing. I have a on-off valve both before and after the Venturi attachment. If I turn the valve, feeding the Venturi, on & off repeatedly it starts to suck the fertilizer. But even when I finally get it primed, it doesn’t pull any fertilizer.
Finally a video where somoene doesnt talk about gallons or cubic donuts per feet! Thanks
Thank you for your diligence. It is amazing to have wonderful, unselfish people like you!
My number one question was what will happen if my “fertiliser” bucket runs dry. With your first answer you have showed me without intending haha. Thanks mate!
You have given me a perfect solution for the challenge I have been experiencing.
Many thanks.
Happy to help!
Your video is the only one I could find that actually explains the ratio, great job and thank you
The main problem with this setup is the back pressure created by the hose-end sprinkler causes the venturi siphon to stop working. Water going in the wrong direction is not the problem. It can't go backward due to the spring and ball backflow device inside the right angle of the venturi. These venturi siphon devices work fine when there is no (or negligible) backpressure on the end of the hose. This means an impact sprinkler or similar won't work....in my experience.
yes this is the same problem im having, has anyone been able to resolve the issue
Ναι έτσι είναι. Πιστεύω πως θα πρέπει να υπάρχει η ανάλογη διαφορά πίεσης και να εξασφαλίζεται ένα όριο ροής. Αυτο είναι και το κριτήριο για το μέγεθος του venturi. Εγώ δεν κατάφερα με το μικρότερο να έχω αναρρόφηση με παροχή 600lt /h
thanks for that it was the only video that showed me how to use my venturi, I got from China ($1.00) I was having problems getting it to suck but then I used a nozzle on the end of my hose and it's now all good, cheers mate.
I'm glad it helped!
In my area where i live we irrigate 100s of acres of ground crops, many irrigate their vinyards with drip.
There are sozes of these up to 4" abailable, so sizing is important, we have a gauge on both inlet and outlet and need a pressure drop on outlet to syphon, i use these st my home orchard, veggie garden and ornamentals, i use the correct sizing for flow, for me i use the water meter to know flow/sizing.
Thanks heaps I was going to buy one of these but couldn't work out how to decipher the ratio of fertilizer you have solved that problem for me thanks heaps your video is very informative
@ChilliChump
-Why doesn't water get out the suction pipe?
Standard under the venturi in the connection cap of the suction pipe there will be a one-way-valve (just a piece of plastic with a spring).
-No suction
2 possibilities:
1. as you said, reverse mounted venturi
2. oversized venturi: home use pipes are 1/2" and a 3/4 " or 1" venturi will get an insufficient pressure drop to create suction. Bigger is not better in this case.
I was planning to buy a 1 inch venturi and install it with my 3/4, but your comment changed my mind. Will buy a 3/4 venturi. Thanks
The venturi has a check valve. There is probably a ball under the threaded-on, small hose barb. Without the check valve, it would in-fact flow backwards due to the pressure.
Hi Nicholas. I thought it did as well, but I had someone message me on s previous video I did on this saying that it was pushing water into the fertiliser resovoir. So I was just demonstrating that it couldn't really happen. I am guessing they either had the pipes in the wrong place or they had a faulty Venturi! Mine definitely has the check valve
Hi ChilliChump, thank you for the video. Could you confirm which part is the check valve is located? Is it a check ball with spring? I examined my barb fitting to the mixer pipe and didn’t see any. Maybe I missed it or lost it?
@@HuiKenZheng it could possibly be a reed valve if it isn't a ball.
The check valve is definately meant to be there. I bought mine and it did not have the ball inside. I used a BB Gun ball in it and it works a treat. Also found that my hose addapter was restricting the flow which made the water go into the fertalizer instead the other way around. Hope this helps.
@@kothedarek I can see it being very likely to have parts missing! A lot of people don't conceptually grasp how check valves and venturies work and are used.
We basically did this experiment at secondary school in science showing how a y (off sided y connection? ) connection on a tap and hose can crush a petrol can.
I just tried this at home, the system works when it's not connected to my drip feed irrigation system, as soon as I connect it the mixer stops working. But everything else in your video at least helped me set it up and to do the math! ;-)
It’s too much back pressure from the drip system. I had the same problem. It depends on your water pressure and everyone has different water pressure. With mine, I had to set up two sprinklers connected to each other to make the outflow high enough to get the suction to work, otherwise it did run back into the fertilizer tank through the Venturi. My water pressure was just too high...
I have the exact problem being described, the system will not uptake with a sprinkler due to back pressure.. without a hose attachment it works fine, the Venturi is set up in the correct direction
Hi, I think that the problem in having the venturi not working is if the flow rate is too small. try your test again with the red dye, and just put a small flow through, restricted by your had sprayer.
There's a check ball in the pickup leg. If you remove the barb fitting you can kinda see it. You can alternately blow and suck on that fitting and feel it working.
That makes sense! I was only commenting on that because a viewer was having issues with water going into their fertiliser resovoir.
It’s a question if I use a piece of glue and snipped off the tip of the hose they gave me do you think that’s probably where this ball was because that would probably explain why it’s blowing water through the sides, and instead of pulling it up through the siphon and that’s the question I’m having trouble with. I have it on the flow system as well but it was working at one point I know it’s not so I’m trying to figure out the pressure thing or the gravity thing if it’s too high up or too low down or if the pressure is wrong at one end or the other or if I just have to buy another siphon that has the ball in it.
Now it’s not*
The math lesson of total output helped me out a lot
Did some experiments using a 1/2in venturi siphon. Here are the results. Unable to get it to work with a 40m wall mounted Hozelock reel or a 20m hoze. Am only able to get it working with a 10m hoze
My garden hose was above the liquid fertilizer. So may be gravity was a reason for back flow . Thank you so much for this video . I’ll do a test again may be not now please since I’m totally into something else
Thank you for the video. It’s amazing! I have been trying the Venturi siphon for home gardening.
I bought the siphon exact the same as the Amazon link in your video description. My only success is with a open-ended pipe. Once I connect any sprayer or sprinkler, the water flow backward to the mixer container.
I didn’t see any check ball or spring when I examine its barb fitting to siphon pipe. Could someone confirm there is indeed a check ball or something in that?
One last thing, this video is the only *home gardening* one that I saw in CZcams that has huge success with Venturi siphon. All others home gardening could only get it working with open ended pipe. Once a sprayer is attached, it flow backward. It’s also amazing that in the video the water won’t run backward even when the sprinkler is shut off. I never see that in other video.
I wonder if it is because of using hozelock system?
I'm glad you enjoyed my video. The trick is to balance the pressure coming from your tap with the pressure at the sprinkler end. If the pressure is too much at the sprinkler side, then the Venturi won't work.
Could I know what diameter size of garden hose and the Venturi do you use? Are they both 3/4”?
3/4" BSP Venturi, 1/2" hose IIRC
I'd guarantee that any issue priming the system with this set up is pressure related. I can get mine to run on my house pump but my submersible pump that goes up a hill to my market garden won't run it.
You are amazing, please believe it
You are very kind!
Thank you for this helpful video. This may be a stupid question, but if the total input is 360 ml for 5 liters of total flow and you needed to add 100 ml of fertilizer per 5 liters, then wouldn't you add the 100 ml to 260 ml of water to give a total of 360 ml rather than add 100 ml to 360 ml which would give you 460 ml and you'd have 100 ml left after 5 liters total flow?
100 mil to 260mil would be the correct concentration for the pickup line yes.
I'm guessing they just put a check valve in the T of the venturi
because there is nothing that would naturally prevent back flow the low pressure is only created at the orifice when there is moving fluid past it.
It does have a check valve
Air in the main supply water line ( that is what i found when I had the same problem) bleed the main line siphon will start working
Really good video, well explained, thanks!
Does it make a difference if you place the syphon container under the Venturi device, or on the same surface? Perhaps gravity is helping against the back flow with the container at higher elevation. 🤷🏻♂️
I'm late I know 😂 but the viewer probably unscrewed that barbed fitting from the venturi and screwed on there own pickup tube. You can't do that though cause as others have said there's a built in check valve in the barbed fitting. If there was absolutely no flow restriction it might work (i.e. you have no hose pipe attached to the outlet) otherwise you'll get back fed water.
Awesome. Thank you for the calculations walkthrough. What of hose disconnects are those? I’ve tried some from the local big box store but they don’t work well.
Hi there. I have 100 square metres of green house. It says I must use 50ml solution diluted in 5l of water. Clearly 5l is not enough to water the plants. Should I irrigate the plants with water at first then at the end apply the solution? If i put the house in a bucket with 50ml of solution do I need to add water into it to make it flow better? Wont it become super diluted if its also adding more water to the solution when irrigating?
I had that problem- what I found out if you connect it to the water supply it will happen, the Venturi has to be vertical or horizontal what as if it’s connected to the water supply the angle is incorrect - I finally used some pvc fitting to get it vertical and it works as it should
Hi, I couldn't understand your comment properly. Should I install my venturi vertically with the direction of water facing downwards?
@@haseebtubing hello did you ever get your venturi to work?
If so what did you do?
I can't get mine to work and not sure how to purge it.
Great video thank you
I have connected my Ventiri siphon exactly like your one. When I connected the venturi siphon to nothing, it sucked 100% (5:1). When I plugged the outlet to my drip irrigation system, no sucking. So I cannot use it.
You can't have a lot of back pressure, it fundamentally won't work if that's the case. So drippers will be a tough one because you would need a way to let out some of the pressure.
good idea beats making up a watering can at a time :p
Tell me about it! Especially when you are watering a large area!
Got me a 1/2" and the water doesn't pass out I think the water passage is to small maybe I should got a 1" so the passage might be 1/2"
Nice and educative video.
1. Can the venturi be used with compressed air to suck fine solid like alumina powder etc.
I don't see why not... But this specific Venturi soon wouldn't be able to. You would need to make your own modified version. The principle is the same
What’s the point of the calculation thing? Just put in the amount of fertilizer for the specific area, dilute it and pedal to metal until empty. Right?
You risk under or overwatering doing that
Thank you ...very helpful.....have been wondering what ratio do I use for a 200 litre mix on number 5 and number 2 setting uaing the pressures you have
Check valve?
Thank U so much very helpful
Dear ChilliChump,
I need your kind opinion.
This morning I ran the identical venturi siphon like yours on my drip irrigation line for my vegetable garden.
Unfortunately it doesn't work!
While it works very well with sprinkler irrigation like yours or with free hose, unfortunately with drip irrigation it starts well but then immediately freezes.
I made several experiments by rotating the venturi siphon in all positions on 360 degrees and also removing the tap.
Unfortunately nothing to do ...
If I disconnect the pipe that brings the water to the drips, the venturi siphon works very well and is truly exceptional.
The fertilizer liquid I put in is clean because it is filtered. This is water in which I dissolved my earthworm compost for 48 hours.
Is the cause by any chance the back pressure generated by the small holes in the driplines?
What can I do to solve this problem?
Thank you for your answer.
A strong hug
Marco
Unfortunately this type of Venturi will not work with drippers...there is way too much back pressure
@@ChilliChump let's say I have 50 drippers and these are the ones with rotatable heads, which have been opened up almost completely so that water doesn't drip from them, but it flows freely. Do you think it will still not work?
It could work if you manage the pressure pretty carefully. I.e. limit back pressure to just slightly above the input pressure
@@ChilliChump did you mean to say just slightly "below"?
Because you need enough pressure that it will evenly flow through the 50 drippers...while not putting enough back pressure that the Venturi doesn't work
If there's a filter on the feed tube you couldn't use your own made feed because it might have too many particles to block it. If it is sucking up too much feed could you add a pin hole above the feed bottle so it would suck in some air as well as some feed. You'd have to experiment again. I'm just thinking of a more simpler way for countries that only have Chinese junk. America seems to be able to buy items that are made from longer lasting material, like plastics, metal that doesn't rust after one rainfall and the old type paint is the big one. It was so much better oil paint with the thinners in that were bad for the environment. Have the xylene and toluene paints been banned in Australia and America.
i have a durain farm and i already have the dripping system so i find this way is also good for fertiliser my Duran plant through the dripping system i have but i have a question if i have to install the fertiliser injection system before or after my filter system, pls advise :)
I would do it after the filter
dose it work with a drip line irrigation ?
No, not directly. Too much back pressure
@@ChilliChump i will get one any how use it in the greenhouse sprinklers
The item on the Amazon link is pretty sketchy. Both ends of the black pipe are male thread. One end needs to be female end so this wouldn't work for anybody unless you go by the right parts.
Valuable
Will it work on a drip irragation system
It should do...but it would really depend on how many drippers you are running because this relies on a certain amount of flow to work properly.
@@ChilliChump ok will not work they are dripper slow release like a soaker hose
@@patrickbrideauful Hello, Gardena has a fertilizer attachment that works with drip systems and soaker hoses. I use it, works great.
czcams.com/video/3kQQdZlnkrg/video.html
Hello, thanks for your videos. I am wondering how long did it take to suck that 0.5litre in your test scenario. I know it depends upon presure in the system but still would appreciate any input in this area. I am asking as I used Venturi for the first time on a weekend and after roughly 30 minutes it sucked appr. 3 litres of fertilizer. I thought initially it could suck much more fertilizer in 30 minutes. My Venturi was set on highest thruput number.
Thanks, Peter
How thick was your fertiliser? I find I get better throughout when I dilute it with water...it can be a bit like syrup otherwise
Thanks for prompt reply. Size is same as yours (at least from this visual comparison). As I was bit disappointed by sucking volume I used my aquamix from birchmaier
And I used powder soluable fertilizer (yara)
I tried using the Hozon Injector which is similar to the product you are using, but mine is much smaller. It will not work if I attach a watering head to the hose. An thing I add to the hose restricts the water too much and the syphon will not work. I see on amazon, there are Venturi siphons like yours in different diameters. Have you ever experiences problems like what I have described? What would be the advantage of a larger diameter verses a smaller diameter siphon?
I haven't had to use Venturi siphon with different diameters because the one I have works fine for my purposes. If you have a higher flow rate then a larger Venturi siphon would be needed. With a lower flow rate, a smaller siphon.
Ive had the same issue waste of money
I have same problem diameter is 3/4 from the venturi and wall instalation is 1/2 and i doesnt want to work..so is there a rule same diameter of venturi and same in wall instalation or venturi must be smaller??Thanks
Do you know the pressure at your tap? Thanks!
I believe it is regulated to 45psi
Is there a U.S. version of this device?
yes I bought one on amazon but you have to buy the proper connectors..they dont use NPT so get a BSP to MPT adaptor
Have you tried this with granular fertilizer?
No, only liquid. I guess it will be fine with granular...you would just need to make sure it is dissolved properly
@@ChilliChump you could also use filtered compost tea.
A me non funziona 😖
make a video and turn it around and show what happens
Turn what around?
Can't get mine to work 😞🤔
Make sure the water is flowing in the right direction (should be an arrow on the device indicating the flow). Also try reducing the pressure coming from your tap
@@ChilliChump yer it is could not get to suck any liquid
Martin Hague I have the exact same issue... I bought a second one and got the same results. I even tried removing the spring from the check valve to see it that would help and nothing.
I have a on-off valve both before and after the Venturi attachment. If I turn the valve, feeding the Venturi, on & off repeatedly it starts to suck the fertilizer. But even when I finally get it primed, it doesn’t pull any fertilizer.
@@realrasher hi think its possible to do with water pressure been far too high 🤔 but I could be wrong
You really need to start it off with a low water pressure, and slowly increase. The Venturi effect won't happen when the pressure is too high