Re: [Killietalk] Re: R/O Question

[Wright Huntley <jwwiii at pacbell_net>]

David Lains wrote:

> Hello All
>
> Is deionization a possibility for those in water limited areas?  They have
> 100% out put (no waste).
>
> I know some exchange sodium for other cations but are there higher end
> resins that are not ion exchange?

The sodium exchangers are simple water softeners that exchange sodium 
for divalent ions like Ca and Mg.

Others exchange H+ ions for any other positive ions. They all are ion 
exchangers, tho.

A second set of resins is used to do the negative ions, like Cl- and 
CO3-. Then *all* ions are replaced by either H+ or OH- ions, so all that 
is left, in theory, is pure H2O.

Expensive and energy wasteful, the deionizers *could* be used instead of 
RO units. Recharging the resins uses up lots of water, so I have trouble 
seeing the advantage over just using the RO discharge for water needs 
where the tds content isn't a particular bother.

Those mixed-bed resins that make you throw away the cartridge are beyond 
consideration, IMHO. They are only for the very wealthy (or foolish). :-)

Wright

--
Wright Huntley -- 760 872-3995 -- Rt. 001 Box K36, Bishop CA 93514

           Mencken's maxim—every election is a sort
             of advanced auction of stolen goods.



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