airwaterice.com, typhoon 5 stage is what I have, I have the 75g per day unit, shoulda got the 100gpd but oh well. Easy as heck to hook up and works like a charm. Hooked it up at noon and by six o clock tested the water out of the RO/Di and my normal water was 417ppm and the RO/Di water was at 3ppm and it wasn't even broken in yet!