| Re: Buying the Best RO/DI (help put all the info in 1 place) I got a Watts 5 stage from CostCo. I think it was about 140 and a year worth of filters was 25. They have an option you can add later that is a 'no waste'...I'll have to check more into it later. It has a 3 gal tank so only like 9 gal a day max. I had a hospital tank that I changed the water daily on so I changed the filters at 3 mos instead of 6. |