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I have a question about what RO filters remove. I had heard that they remove just
about everything (up to 99%) but can't get phosphates, nitrates, and silicates.
One would need a DI unit to extract these. I tested my tap and RO water for
phosphates and nitrates (I don't worry about silicates) and found 0 nitrates in
both, high levels of phosphate in the tap, but none in the RO. How is this
possible? Can the carbon pre-filter remove phosphate? Thanks, Kevin