plaster of paris is not a good idea. Rod Farley explained why. but the result is pH
levels that swing up and down and dead fish. use organic dolomitic limestone instead
for hardness. but they have high pH so they need an acid like HCl or muriatic acid
to bring the pH down. Ingrid


Plaster of paris from lowes also works well. Fill the bottom of a laundry
basket, let it harden and dry, put it in the filter or out of the way.



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