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Re: RO extraction

Kevin writes:

> Bob, Here I quote from the Pet Warehouse catalog (admittedly not the
>  best source of accurate information):
>  "But, unfortunately, the standard R.O. membrane will not remove some
>  nuisance chemicals like phosphate, nitrate & silicates.  ....  For this
>  reason, you would need to use one of the R.O. units with a final stage
>  deionization (DI) cartridge like the Maxxima series.  The DI resin will
>  remove any phophate, etc., that passes through the R.O. membrane."
>  Is this just BS to sell another product?  Kevin

RO units are good, but not perfect.  De-ionization will remove the very 
minute amounts left.  By your own tests, and your own experience, the RO 
removes enough to meet your needs.  So, what are you going to do, believe the 
sales literature and spring for a second stage, or go by your own experience 
and accept that you are getting good enough results with just RO?

Phoshates and silicates are much larger ions than Ca, Mg, or any other 
single-atom ion.  If the filter can keep the small ions trapped back in the 
discharge, certainly large ions don't stand a chance.

Bob Dixon
Cichlid Trader List Administrator