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Thread: Can't raise my chlorine level after draining pool

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    Can't raise my chlorine level after draining pool

    Please help... 13,000 gallon inground pool. Have ozonator and use Trichlor tabs. My CYA level was 175 and drained 75% of my pool water on March 21. Retested my CYA after refilling and it was 20ppm. Chlorinator set on 2, and can't get FC level over .5ppm. Have been using liquid bleach to support the chlorine level..Water is crystal clear and no signs of algae.

    Thank you for your help.
    13,000 gallon, in ground, pebble tec finish, All Pentair equipment, Ozonator

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    Mod Squad JVTrain's Avatar
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    Re: Can't raise my chlorine level after draining pool

    If you could post full test results along with dosages that you've used, that would be helpful. Are you using Pool Math to calculate your bleach additions? What FC level are you targeting?

    You should be dosing to get to 4-5 ppm FC. Do so and test the water for FC and CC 30 minutes after adding. Are you hitting your FC target? Do you have CC above 0.5?
    Joel - TFP Moderator - Minnesota - **Become a TFP Supporter!** Helpful Links: ABCs of Pool Water Chemistry - SLAM Procedure - Chlorine/CYA Chart
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    Mod Squad YippeeSkippy's Avatar
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    Re: Can't raise my chlorine level after draining pool

    Which test kit are you using?
    My Amazon Smile for November12K Fiberglass IG, Infinity 4000 automatic cover, SWCG, Hayward Sand Filter, Hayward 1.5 Pump, Doheny Discovery Robot, Savi Melody LED pool lights, outdoor speakers and other assorted doo-dads. Sundance Altamar Hot Tub.
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    Re: Can't raise my chlorine level after draining pool

    Hello,
    thanks so much for responding...Attached are my readings from before I drained the pool to current. I have been using a Taylor K-2006 test kit.
    Also we have an ozonator and light usage on our pool...So last summer we kept the FC to approx 2 with no issues. We use Pool Math to adjust our chemicals.
    Problem is that we have been adding liquid bleach to supplement the chlorine and kept moving the setting up on the trichlor, now up to 4...We have also
    kept the chlorinator full with tablets. Our only thought is that the CYA is now so low that the pool won't hold the chlorine.

    Thanks in advance for your help,
    Cindy MenickAttachment 48045
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    13,000 gallon, in ground, pebble tec finish, All Pentair equipment, Ozonator

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    frustratedpoolmom's Avatar
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    Re: Can't raise my chlorine level after draining pool

    I guess I have two questions before I can advise...

    Have you done an OCLT at all?
    What is your plan for daily chlorination going forward?
    Helpful links: Pool School; CYA/Chlorine Chart
    24' round AG pool, 52" high, Raypak heater; Waterway 2 spd Pump;
    150 Sq ft. Clearwater Cartridge Filter; Former and DISSATISFIED "Pool Frog" owner
    http://www.PerfectlyClearPoolService.com

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    Re: Can't raise my chlorine level after draining pool

    No I havent done an OCLT...Didn't even hear of this, thanks for bringing this up...But looked up on Trouble Free Pool , it states that I must have at least 3ppm of FC..We never
    have our FC over 2, so not sure this will work. The water is crystal clear and we haven't been swimming yet. Completely refilled 77% of our pool on 3/13.

    Going forward we are want to use the trichlor tabs and ozonator as we did last summer. This is the second summer owning the pool. Only using the liquid bleach for now.
    Thanks
    13,000 gallon, in ground, pebble tec finish, All Pentair equipment, Ozonator

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    frustratedpoolmom's Avatar
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    Re: Can't raise my chlorine level after draining pool

    Ok well if you are going to use tabs you want to start with a low CYA anyway. Going up to 3 temporarily will not hurt anything, you can do it with 2 even.

    The point is to detect any FC loss taking the sun out of the equation. So tonight test the FC and if it drops by more than 1, then something organic in your water is consuming it. I recommend you add 2ppm of liquid chlorine about 5 or 6 pm. Test the FC about 8pm. Compare the results to the test in the morning and see what ya got.
    Helpful links: Pool School; CYA/Chlorine Chart
    24' round AG pool, 52" high, Raypak heater; Waterway 2 spd Pump;
    150 Sq ft. Clearwater Cartridge Filter; Former and DISSATISFIED "Pool Frog" owner
    http://www.PerfectlyClearPoolService.com

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    Re: Can't raise my chlorine level after draining pool

    Thanks, will do that...I am a former Chicagoan , been in Texas 3 years, miss Chicago food.
    13,000 gallon, in ground, pebble tec finish, All Pentair equipment, Ozonator

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