sodium levels after typical water softening wont hurt fish at all...except need to
put the calcium buffer back in to prevent pH swings.
aluminum sulfate can be used to precipitate the calcium out of the water if really
necessary. Ingrid

What makes water hard is that it just has dissolved calcium compounds in
it. Water softeners just replace the calcium with sodium which is
harmful to many living things. I would much rather have the calcium
than sodium. Calcium is beneficial to many living organisms. Softened
water is toxic to many living organisms.



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