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Another issue that was considered is if the Ca(ClO)2 solution is going to be pre-settled before being applied to the chlorine solution stock tanks, a sufficient volume of water must be added to the chemical in the container that the solution is being settled out of to completely dissolve the Ca(ClO)2 in solution. The solubility of Ca(ClO)2 is 210 g/L. In certain communities the concentration of Ca(ClO)2 required for chlorination of the water supply necessitates a large enough weight of Ca(ClO)2 that the amount will not dissolve in a 5 gallon drum of water ( Figure 6), which is the procedure that some operators have been implementing.
Figure 6. The volume of water needed to dissolve different concentrations of Ca(ClO)2 in solution.