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RO extraction

To: Aquatic-Plants at actwin_com
Subject: RO extraction
From: "Kevin Zippel" <kzippel at wcs_org>
Date: Thu, 09 Sep 1999 15:58:24 -0400
References: <199909090748.DAA15676 at actwin_com>

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

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