DO NOT USE MARBLE.. dont even use oyster shells. your pH is high already. get
aquarium pharm total alkalinity test kit. I suspect your calcium is fine already.
unless your city is adding NaOH to the water.
Ingrid

Crashj wrote:
My Tetra Koi test kit says to use one drop per KH number to measure
the hardness. To get to 100 is going to use up the whole bottle! There
must be a better way or some other test kit chemistry?
So I guess I need to add some marble chips or oyster shells to get the
KH up? pH measured 9.0 in the late afternoon. I do not plan to worry
about the alkalinity until KH is in range.



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