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Thread: What should FC be when closing pool?

  1. Back To Top    #1

    Join Date
    Jun 2016
    New England

    What should FC be when closing pool?

    In the guide, it says to slam the pool, then let it come down to normal levels.

    I also read other people saying they close the pool at slam levels.

    21' x 43' IG 40K Gallon vinyl and concrete pool; liner: 2016; Hayward DE7220 filter; Maytronics M400; TFT-100; Speed-Stir

  2. Back To Top    #2
    Mod Squad JVTrain's Avatar
    Join Date
    Feb 2014
    Central Minnesota

    Re: What should FC be when closing pool?

    I bring the FC up to shock level for my CYA the day/night before closing. Then I close the next day. It's not overly critical what FC you close at as long as it's elevated above target levels. It's more critical that your water is cold. 60 degrees.
    Joel - TFP Moderator - Minnesota - **Become a TFP Supporter!** Helpful Links: ABCs of Pool Water Chemistry - SLAM Procedure - Chlorine/CYA Chart
    40x20 Pool: 32K Gallons * Vinyl * Bleach Chlorination * Hayward S270T Sand Filter * Pentair SuperFlo 1 HP * Teledyne/Laars Heater * AquaVac Tigershark * TF-100 w/ SpeedStir
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