Some amount of calcium is ...

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Some amount of calcium is desirable in drinking water normally of 75 mg/l. Even upto 200 mg/l is permissible as per BIS standards. Excess  calcium may be removed through either lime softener or zeolite softener. But excess sodium is injurious to heart. Hence first get the water samples analyzed as suggested by Juan Jose and then you can proceed accordingly to remove the excess calcium or sodium.