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Thread: Old pool, new wter

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    Old pool, new wter

    I've just refilled my pool after draining about 7/8ths of the water due to high calcium hardness and some broken tiles. My numbers are FC, TC are.25 or less so CC is 0, PH is 6.8, TA is 140, CH is 220 and CYA is unreadable (somewhere under 25). I've read I should use bleach upon startup. Any pointers would be really appreciated.
    George, Porterville, CA.
    26,000 gl. inground plaster pool with sta-rite 1 1/2 hp pump and sta-rite 300 ft
    cartridge filter 100gpm.

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    JasonLion's Avatar
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    May 2007
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    Re: Old pool, new wter

    The first thing to do is to add 2 ppm of chlorine. Bleach is a great way to add chlorine.

    I would raise the PH just a little, say to 7.0, with Borax.

    You should raise the CYA level to around 40 to 50 with CYA/stabilizer/conditioner.

    Once you have things more under control, you can fine tune your levels further.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
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    Re: Old pool, new wter

    Thanks, I had heard bleach was a good way to go, but i haven't heard about using Borax. I'll check that out. If I can ask another question; What causes calcium hardness to rise?
    George, Porterville, CA.
    26,000 gl. inground plaster pool with sta-rite 1 1/2 hp pump and sta-rite 300 ft
    cartridge filter 100gpm.

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    Join Date
    Jan 2009
    Location
    Cupertino, CA
    Posts
    1,966

    Re: Old pool, new wter

    Quote Originally Posted by mavs215
    What causes calcium hardness to rise?
    Well, calcium. (Oh so helpful...)

    There are various sources. Fill water; but given your current level and massive recent replacement, that is okay. The plaster surface of your pool; a low pH over time will leach calcium out of the plaster. Then there's calcium hypochlorite powder, a common source of chlorine and often called "shock" by the pool stores.
    --paulr
    BBB "Intermediate Swimmer"
    IG plaster pool 18.5K gal, Hayward Pro-Grid DE filter, 3/4 HP Hydramax II; Polaris 380, 3/4 HP booster
    AG spa 325 gal, probably Sundance of some kind
    Water testing instructions on one page

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