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emc7 · 07-03-2007, 11:53 AM

In a fresh water tank, it most likely calcium carbonate or calcium chloride. You need an acid to remove it. Vinegar and lime-a-way work. Wash it in the sink and rinse well.

07-03-2007, 11:53 AM	#4
emc7 Senior Member Join Date: Jul 2005 Age: 39 Posts: 2,900	In a fresh water tank, it most likely calcium carbonate or calcium chloride. You need an acid to remove it. Vinegar and lime-a-way work. Wash it in the sink and rinse well.