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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