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Thread: Just drained and refilled My Pool To Reduce CYA

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    FresnoPoolDad's Avatar
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    Aug 2012
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    Fresno, CA
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    Just drained and refilled My Pool To Reduce CYA

    Hi folks. I had an algae problem about a month ago which my old pool service resolved with algaecide. After receiving lots of advice from folks here at TFP, I fired the pool service and been using bleach as my sole source of Chlorine. My pool has been sparkling since. As my CYA was at 100, you all advised me to drain and refill. I did that yesterday and today bringing CYA down to 40.

    I tested today with a TF-100:

    FC 2.5 (apparently the chlorine level of my tap water)
    CC 0
    TA 70
    CH 160
    Ph 8.2

    Other than my FC which I know needs to go up to 5 @ CYA 40, what should I adjust? It seems that TA and CH (pool is pebbletech) are okay but I should bring Ph down to 7.2 - 7.4, right? Is there anything else that one needs to do after refilling?

    Also how do I test for borates? The instruction card for the TF-100 does not seem to have instructions for that test but I read that it should be 30 ppm?

    Thank you for your help.

    Dan
    Current Pool Condition: Blue
    Current husband condition = Easy chair
    IG peebletech = 10,000 gal (1992)
    Filter = Predator 200 sq. ft.
    TF-100
    Knowledge about pool chemistry = Nada

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    duraleigh's Avatar
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    Sebring, Florida
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    Re: Just drained and refilled My Pool To Reduce CYA

    Adjust your pH down to around 7.4 or so...do that sooner rather than later.

    Borates are an optional item that some folks chose to put in there pool but they are not necessary for good pool water management. Test strips are available for borates shouold you chose to put them in your water but they are not part of the TF-100 kit.

    Your other parameters will look about spot on the money once you get your FC in the 3-5 range.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Dumfries & Galloway, Scotland
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    Re: Just drained and refilled My Pool To Reduce CYA

    ^^ Dave's advice is all spot on, I would only add informed read up on borates is in chemistry 201 should you wish further information.

    Regards
    Stuart
    Stuart Murray
    Scotland UK
    UK NPPOC

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    FresnoPoolDad's Avatar
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    Aug 2012
    Location
    Fresno, CA
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    Re: Just drained and refilled My Pool To Reduce CYA

    Thanks for the quick responses! I have muriatic acid already so I will adjust both FC and Ph immediately.
    Current Pool Condition: Blue
    Current husband condition = Easy chair
    IG peebletech = 10,000 gal (1992)
    Filter = Predator 200 sq. ft.
    TF-100
    Knowledge about pool chemistry = Nada

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