I'm using four wf's separate everything and what a PITA! IT's alot of work. I want to increase my units but I can't get my head around the res/controller/upgrade kit. I'd love to see a step by step or sketch kinda thing. GH has an install pdf on their site but I must be fried! It seems like it could prob. be made out of rubbermaid tubs and stuff but I'd be willing to get the kit from them just not feeling confident on getting it installed. Anyone willing to help please let me know with message or something. Thanks to all for the efforts, sorry some of us seem so dense! LOL.