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Thread: Cannot keep Chlorine in the pool...and cannot get CYA to increase

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    chumbley's Avatar
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    Cannot keep Chlorine in the pool...and cannot get CYA to increase

    I cannot keep FC in my pool this year. I had a bit of a problem last year, but it is much worse this year. We are adding a gallon of bleach nearly every day to keep up. Let it lapse a few days, and the FC drops to 0 and the pool immediately turns cloudy, can't even see the bottom.

    ~28K plaster pool. DE filter, solar heat, IC 40 salt cell. Pump runs about 12 hrs / day during the day.

    TF100 test kit results:
    Water temp 85
    Salt level 3200
    FC - goes to 0 quickly
    pH 7.6
    T/A 130
    CH 270
    CYA 40

    I have been trying to get CYA up, but no matter how much stabilizer I add, it never seems to change. Had the pool store test, same results. Bought new CYA reagent, same results. I've probably put in 10 lbs of CYA this year, no change. Filters cleaned, DE replaced, salt cell acid washed, etc.

    Pool store, of course, said we have high phosphates. We ignored that.

    We only use liquid acid when pH needs help, and bottled bleach. Maybe a bit of polyquat at closing time, along with RV antifreeze in the lines. Nothing else hits the pool. Well, except for Katy the wonder dog.


    Jeff

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    BoDarville's Avatar
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    Re: Cannot keep Chlorine in the pool...and cannot get CYA to increase

    First, congrats on getting the TF-100.

    We are adding a gallon of bleach nearly every day to keep up. Let it lapse a few days, and the FC drops to 0 and the pool immediately turns cloudy, can't even see the bottom.
    If you go days between chlorine additions, especially at this time of year, the FC will drop to 0. Chlorine is constantly being consumed as a part of doing its job of sanitizing the pool - this is entirely normal. A pool is under constant assault from microbes and organic contaminates. These are killed off when proper FC is maintained. However, if you let FC drop to 0, then these contaminants can take hold. Usually, the first sign is a cloudy pool or algae. To clear up the pool, you need to perform a SLAM. Stock up on lots of plain unscented liquid bleach w/o any added thickeners.

    I would suggest reading these articles to give you an overview of our methods of managing a pool:
    1. ABC's of Pool Water Chemistry
    2. Chlorine CYA Chart
    3. Recommended Pool Chemicals
    4. Recommended Levels
    5. Pool Math
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    Mod Squad woodyp's Avatar
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    Re: Cannot keep Chlorine in the pool...and cannot get CYA to increase

    You sound like a prime candidate to get one of those aquarium tests that checks for ammonia. There has been an absolute rash of threads on here as of late concerning cya being converted to ammonia and pool holding zero FC.
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    Richard320's Avatar
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    Re: Cannot keep Chlorine in the pool...and cannot get CYA to increase

    You have the TF100. Any reason you're not running the CC test? That would tell us a lot.

    And if the salt cell and additional bleach can't keep up, I'd say it's time to start shopping for the best price on bleach because a SLAM is called for. Algae or ammonia, either one, the solution is bleach. Lots of it. And 40 CYA is pretty good for that. Might as well order up your FAS-DPD refills now, too. The faster you get this problem licked, the more summer swim time you'll have afterwards.

    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
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    chumbley's Avatar
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    Re: Cannot keep Chlorine in the pool...and cannot get CYA to increase

    Thanks for the quick responses. Dumped in 2 gallons of bleach about an hour ago. FC is now 0.5, and CC is 2.5. Looks like I'm headed to the bleach store...

    Jeff
    28K free form IG pool, pebble finish, spillover spa, Pentair IntelliFlo VS, IntelliChlor IC40, Easy Touch 8 PS, Quad 60 DE, Aquabot Supreme, Hayward LP heater

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