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On the subject of tap water, does anyone (Randy) know if a countertop water filtration system would improve the quality of tap water. I have an Aquasana 4000 which uses carbon block, cocunut shell and a potassium ion exchange filter. I've never used it for makeup water for a marine tank, but use it for drinking water. I know it is supposed to remove lead and other heavy metals using potassium as a replacement ion for these. I also understand that it doesn't remove phosphate. Would the potassium be an issue?
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