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Thread: Chlorine Level Question

  1. Back To Top    #1

    Join Date
    Mar 2013

    Chlorine Level Question

    Per the CYA/Chlorine chart...I should be roughly 6 PPM FC given my CYA of 50. Is there any downside to targeting a higher number - say 8 or 9? At times I'm just not able to test my water each and every day. I was thinking that the higher target would give me a little leeway if the Chlorine level does drop down significantly on a day I'm not able to test the water.

    Also, any ill effects on a vinyl pool liner keeping my Chlorine level at 8/9 all Summer long? I'm most concerned with the potential of "bleaching" all the colored graphics on the liner.
    16 x 32 In-Ground vinyl, 21,000 Gallons, Hayward Cartridge Filter, Hayward Tiger Shark robotic cleaner, Taylor K-2006 Test Kit

  2. Back To Top    #2
    Mod Squad jblizzle's Avatar
    Join Date
    May 2010
    Tucson, AZ

    Re: Chlorine Level Question

    The most import thing is to keep the FC above the MINIMUM for your CYA. Your pool would be safe up to shock level, so you should not see any fading.

    The downside to a higher FC level is that you lose a % of the FC to the sun each day, as the FC level is higher, you lose more FC to the sun at a given CYA level.
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
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  3. Back To Top    #3

    TFP Guide

    chiefwej's Avatar
    Join Date
    Jun 2011

    Re: Chlorine Level Question

    Best it add chlorine after the sun if off the pool. That allows the FC level to stay up overnight before the sun starts to burn it off.
    Tucson, AZ
    16x36 rectangular (19k) Pebble Tec play pool/spa, Pentair Intelliflo VS 011018, Super II 2hp (spa), Aqua Rite T-15 SWG, Pro Grid 60 DE, Hayward H400 & Heliocol Solar heating, A&A infloor system, fill water w/high CH and TA, 50 ppm borates,TF-100 test kit

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