Randy Holmes-Farley
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Yes, moisture can mobilize the alk and calcium allow them to interact and form insoluble calcium carbonate.
Any time someone asks if clumped salt is OK, my response is check the alkalinity. If it is OK, the salt mix is OK. If it is low, you might toss it, or at least supplement the alk (and maybe calcium) back in.
Heat also accelerates the precipitation of calcium carbonate. Some high alk mixes (e.g., Red Sea Coral Pro) warn against too much heating or mixing of new salt water for that reason.
Any time someone asks if clumped salt is OK, my response is check the alkalinity. If it is OK, the salt mix is OK. If it is low, you might toss it, or at least supplement the alk (and maybe calcium) back in.
Heat also accelerates the precipitation of calcium carbonate. Some high alk mixes (e.g., Red Sea Coral Pro) warn against too much heating or mixing of new salt water for that reason.