Hydrologic Stealth RO 200 Complete w/KDF, super simple install, took me longer to take it out of the box and unwrap everything than it did to hook it up. I also picked up a 1:1 flow restrictor to keep the waste water to a minimum. Cuts into the membrane life a little bit but it works great and I think it's better for the environment to have less waste. The standard is a 1:3 clean to waste ratio which is a ton of water down the drain.