I probably spent well over $100 making the ultimate canister filter out of pvc. I used it for about 2 months, then I retired it because I just didn't trust it. Also it was bulky and ugly. I also ended up buying another rena filstar canister to replace it diy canister. I still have a crap load of extra pvc, elbows, valves, headaches, pvc cement, pvc primer, ect. left over from the experiment. That old junk is just wasting a bunch a precious space in my home now.