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Re: RO/DI

To: Aquatic-Plants at actwin_com
Subject: Re: RO/DI
From: "Roger S. Miller" <rgrmill at rt66_com>
Date: Mon, 13 Sep 1999 20:27:38 -0600 (MDT)
In-Reply-To: <199909131948.PAA29660 at actwin_com>

On Mon, 13 Sep 1999, George Slusarczuk wrote:

> Aside from special-purpose RO membranes, optimized for a specific task,
> the "typical" RO membrane excludes about 90% of all anions. Among the
> common ions it does the worst with silicate (85-90%), best with
> sulphate  (~99%) and phosphate (95-99%) because they are large ions,
> easily excluded. Nitrate and chloride come in at about 90%.

I think these numbers also vary with the pressure differential across the
membrane.  Hi pressure gives lower % rejected and smaller waste volumes
and low pressure gives better solute rejection, but higher waste volumes.

Roger Miller

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