I had a bunch of folks asking me to show how I build my 3 stage filters for my bait tank. I tried to make these as compact as I could while making them to where I could easily move it between tanks without a hassel. They are not hard to do and don't take that long when you get everything together. I cut the lip off that one drain fitting with a grinder with a cutting wheel on it but you could easily do it with a sander too. It you have questions, I am C Worthy out on the TFF at texasfishingforum.com. I use my filter in fresh and salt water.
Thanks for looking