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4) Chlorine Stock Tank Modification: Realistically it is going to be impossible to settle and filter out all of the precipitation that forms as a result of using Ca(ClO)2 as a source of chlorine. If all the solution was to be settled out, more will form as the solution comes into contact with carbon dioxide and other chemical species like carbonates found in surface and ground waters. To deal with this it is recommended that communities add a tube inside the chlorine stock tank that rises up high enough that it is well above the CaCO3 that potentially could settle to the bottom of the tank (Figure 4). We recommend that the tube be located at a height of at least 10 cm above the bottom the tank.
*Figure 4. Chlorine stock tank with a bulkhead(out flow valve) located a safe distance above any percipitatioin that would form with a maximum Ca(ClO)2 concentration of 30 g/Lan inside tube that is located high enough in the tank so the flow out of the stock tank is not impeded by precipitated CaCO3.