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Re: Tap water from a water softener

Hello Jeff,

As a rule, a water softener exchanges polyvalent cations for sodium
ions. Thus it REMOVES calcium/magnesium ions and ADDS sodium ions to the

You would probably be better off (speaking in terms of aquarium water)
if you used the raw tapwater in your RO unit -- no excess sodium, which
RO does not remove efficiently.



> Date: Wed, 12 Jun 2002 17:46:16 -0700
> From: Jeff Coart <rapdfire at pacbell_net>
> Subject: Tap water from a water softener
> My tap water is conditioned through a water softener that uses salt to
> remove the dissolved solids from the source water. Because of this I
> have been running it through a R/O unit before reconstituting and adding
> to my tank. The softened water tastes salty but maybe it would be okay
> to use straight from the tap. Does this type of softener actually
> increase the level of sodium in the water? Would it be okay to use in a
> planted tank?
> ------------------------------