This how I builtthe filters: 1, Take a lenght of pvc pipe(3 or 4 inch dia. and the length you desire). 2, cut to your desired length and then clean both inside and outside with alcohol to remove any contaminents. 3,Then use a fitting(2 needed) that has a female end that fits over pipe and on the other end it has a inside thread that takes a male plug that is threaded . silcone the end of the fitting to each end of pipe. I forgot what the fiiting was called...but they are at lowes or home depot. 4,Then you need to get 2 nylon fiitings that are threaded on one end and has a barbed end to except 1/2 inch I.D. plactic hose as used in canister filters..Then drill a hole in the plug (there is a square on the top of plug for removal by a wrench) I used a wood speed bit to make hole..then silicone fitting into hole..it is usally a tight fit..do both ends this way.. 5, Let sit overnite to complete the curing of the silicone...use aquarium grade silicone or equivilent..none with mildew inhibitors in it.. 6, to load filter. put filter floss in first..then your peat moss then top it off with more floss..so now you have floss at both ends and peat in the middle..you can also use carbon or sponges from fluval..put ant thing you want...I use a powerhead with a prefilter to run this... make these any length you want for the application needed or tank size.... Then end result after built should look like a uv filter...or an enlarged filter that goes on your water inlet on your refridgerator water supply. This filter really works fine....my apisto's love the water after I run this..color up nice...nice brown gold water Now if I can find the resin used in the DI filters in bulk I can make tap water purifiers and then regenarate the resin.... The project I am working on now is a spin cleaner for sponge filters the spin clean them with a electric drill ..Let you know how this works out... Any questions e-mail me alsmith1@mindspring.com Al Smith ------------------------------------------------------------------------- This is the apistogramma mailing list, apisto@listbox.com. For instructions on how to subscribe or unsubscribe or get help, email apisto-request@listbox.com. Search http://altavista.digital.com for "Apistogramma Mailing List Archives"!