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calcium carbonate/garden lime

Can someone tell me if it's okay to use garden lime as a source of calcium?
The ingredients are; calcium carbonate as elemental 22%, calcium carbonate
55%, magnesium as elemental 10%, magnesium carbonate 37%, calcium carbonate
to equal 96%. The calcium level in my water from the tap is 5.9 ppm and in
my tank the kH is 2 degrees.
in HOT B.C.