Become a TFP Supporter Pool Math Forum Rules Pool School
Results 1 to 2 of 2

Thread: chlorine drop

  1. Back To Top    #1

    Join Date
    Aug 2015
    Plano, Tx

    chlorine drop

    Hey guys,
    Im kindof at a loss. My chlorine is dropping 1.5ppm overnight and around 5 during day. All other levels are perfect. I'm in texas and its very hot but didnt think it should drop that much overnight in a 12k gallon pool. I have a Hayward DE6000 filter which I thiink is overkill for my size pool and after I did a full cleanout it wasnt dropping at all over night but that didnt last long. Its only been a couple of months ago. Am I missing something that could be causing it?

  2. Back To Top    #2
    Mod Squad Texas Splash's Avatar
    Join Date
    Jun 2014
    South-Central Texas, Marion/San Antonio

    Re: chlorine drop

    Hello and welcome! If you performed the OLCT properly and failed, then you will need to SLAM per Pool School - SLAM - Shock Level And Maintain. Follow those instructions carefully to ensure success.

    Might help for you to post a full set of results as well. What test kit are you using?

    You may also want these pages as well:
    Pool School - ABCs of Pool Water Chemistry
    Pool School - Chlorine / CYA Chart
    Poolmath calculator
    Pool School - Recommended Levels
    Pool School - Recommended Pool Chemicals

    For the OLCT per Pool School - Perform the Overnight FC Loss Test (OCLT)
    When performing the OLCT, remember that if must be done when the sun has dropped – no sunlight on the pool. About 8 hours total is recommended. Also, your FC level should be elevated more than normal. Staring FC could be close to your SLAM level, but no lower than 10. Anything less and you may not receive an accurate portrayal of FC loss (by percentage), even if it’s only 1 ppm.

    Welcome to TFP!
    Pat (a.k.a. Texas Splash) ~ My Pool: Viking Fiberglass; 17,888 Gal; Waterway Supreme 2-sp/2-hp pump; Hayward Ctg filter; TF-100 w/ Speed Stir
    If you enjoyed your TFP experience, please consider donating to Support TFP!

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts