Selling mine, just because I have don't have a big tank to do water changes on anymore, and it's a pain having one setup in an apartment. The brand is a ReefMaster (never heard of it but, it's always worked great for me). It has a fairly new ro membrane on it, probably about another 1-2 years of life left. It does need a sediment filter,carbon block and tubing. It has a 100gpd membrane (made 5 gallons just over an hour) Also have an unopened 50g bag of regular IO salt Asking $75 OBO for the RO/DI and bag of salt. Please PM if interested.