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Thread: Raised calcium hardness and free chloring went to zero

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    Raised calcium hardness and free chloring went to zero

    Everything was great except my calcium hardness. I added enough to raise ch from 100 to 200, and the free chlorine went from 3 ppm to zero in 1 hour.

    Is that common that calcium chloride depletes chlorine?

    I since added chlorine but was curious if anyone knew of whether adding the cal. chloride knocks down the fc levels?
    34000 inground gunite / plaster pool 6 years old with spa. De filter system using fiber clear.

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    Join Date
    Mar 2007
    Location
    San Rafael, CA USA
    Posts
    12,082

    Re: Raised calcium hardness and free chloring went to zero

    Adding calcium chloride should not lower chlorine levels. I've added it with no change in chlorine level. Perhaps the particular calcium chloride you used had contaminants in it.
    16,000 gallon outdoor in-ground 16'x32' plaster pool; Pentair Intelliflo VF pump; Pentair IntelliTouch i9+3s control system; Jandy CL-340 square foot cartridge filter
    12 Fafco solar panels; Purex Triton PowerMax 250 natural gas heater (200,000 BTU/hr output); automatic electric pool safety cover; 4-wheel pressure-side "The Pool Cleaner"

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