Pentair T600RO Style:RO Membrane Refill System (Cartridge + Head): 16

System (Cartridge + Head): 16 1/8"

As far as actually changing it

Then it goes through the activated carbon filter

and all kinds of variables

Pentair T600RO Style:RO Membrane Refill System (Cartridge + Head): 16Now this little guy from Pentair is something special. Tankless, easily replaceable cartridges, and looks like a tiny desktop computer. It even has a bunch of blinky lights to tell you when to replace the cartridges. And the best part? It's one of the least wasteful RO systems on the market. In general, reverse osmosis flush about 3 gallons down the drain for every 1 gallon you get to drink. But that's in really great water conditions. If the incoming