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Hello Roger,

You are right! Besides pressure & the type of membrane, the temperature,
pH, Dissolved Solids content of the source water, and rejection (waste)
ratio also influence the R/O water quality.



> Date: Mon, 13 Sep 1999 20:27:38 -0600 (MDT)
> From: "Roger S. Miller" <rgrmill at rt66_com>
> Subject: Re: RO/DI
> 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