Hardness of water is contributed by following salts except -
The hardness of water is caused mainly by four dissolved compounds.These are Calcium bicarbonate Magnesium bicarbonate Calcium sulphate Magnesium sulphate Presence of any of these salt produces hardness (refer pgno:727 park 23rd edition)
Calcium gluconate
Magnesium chloride
Calcium sulfate
Magnisium bicarbonate
Environment and health