if no chloramine then find out what your local tap water TDS is. Ask your local aquarium store, they should know. Example: I have very low TDS in my tap water, only 5-15 (although I've never seen higher than 7 in years) and very little chlorine so I can get away with using only RO. If your tap water TDS is 50-200 then use a RO/DI 4 chamber. If your local TDS is over 200 I would say go with a 5 chamber. If you use well water probably need a 6 or 7 chamber.
Knowing your tap water TDS first, makes it an easy decision which unit you need.
Knowing your tap water TDS first, makes it an easy decision which unit you need.
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