calcium carbonate is what is used to buffer water. that is what is in lime, in
oyster shells, in coral etc. right. when there is high pH lime wont dissolve. but
naturally soft water is not usually high in pH precisely because it is low in calcium
carbonate. in soft acidic water can toss in baking soda and it hits the water and
dissociates into C02 + H2O. Ingrid

GD wrote:

It is not the calcium or magnesium that serves to buffer pH.
lime does not dissolve at high pH, and
thus calcium will not become biologically available.




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