| Re: RO/Di units
3 stage is basic, 4 is good plus the DI stage if you want DI stage adds cost. Dont get super cheap 35g a day rating is OK for a small tank. You'll start making water more than 1 day from youre WC day. Get one with a pressure guage. TDS meters are about $35.00 You'll know its getting close to changing the filter time when the sediment filter stage gets brown. Thats if you get one with clear stages which is best. The DI stage filter will also turn color.
1yr standard change out of filters less if you have really bad water. Most/some local water filtration / water supply stores will test water for free mine does. New filters cost me a little over $100 for 4 stages |