RO units, I have a under sink filter that I have been using for tank water that has a Charcoal cartridge and a Micron(25). I am having green water problems in my tank that I think may be a result of the tap water. The water did turn cloudy shortly after a 10% water change. I did another water change with RO/DI water that I bought last night. Hard to say if it has helped any yet. I go throught 3 18L water jugs that I fill at Safeway every week and a half that the Dogs and Cat drink so it would pay for its self in the long run.
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