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Re: [APD] KH question

The with crushed coral, IMHO, is that it doesn't give a very stable KH -
when you first do a water change there's little to no Ca in the water, and
then as the water runs through the filter the KH rises over time. In my very
soft water I use either Flourish Equilibrium or CaCO3, which has the benefit
of raising both GH and KH but the disadvantage of slow dissolving. I like
the Flourish EQ, but it does get spendy.

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