I bought a 100 gpd RO
unit off Ebay a few years ago. It has been a great unit. What I have learned since then is that the 100 gpd is not that great of a membrane. I believe it normally has a 92% rejection rate so you will be working the DI
a lot harder. It will cause your DI
to run out quicker. A 75 gpd membrane has a 98% rejection and the water output difference is marginal.
My unit also came with a small non refillable DI
cartridge. The full size color changing cartridges and vertical positioned DI
would be better.
I have since upgraded mine and still saved money from what some of the name brand units were. There are a lot more choices now than what was around a few years ago.
*180 gal Display, 100 gal basement sump, 33 gal refugium, 3x250 MH, 2x160 VHO actinics, zoos, some softies, LPS & lots of acros and other SPS.
*100 gal prop tank plumbed into main system w/ 2x96 PC lights and 1x150 MH,