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Thread: Pump time/heater and SWG percentage.

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    Pump time/heater and SWG percentage.

    So, for now, day to day, my SWG percentage is at 45% w/ a salt level of ~3300 and a pump run time of 6 hours per day for a free chlorine level of ~5 at a CYA of ~70. My question is, do I need to decrease that percentage while heating my pool as my pump will run continuously for ~24 hrs at a time in order to keep the FC level at ~5? I figure a longer run time, a lower percentage for the same FC. I ask because I've been checking and noticed that my FC has dropped to ~2 after 4 of us swam for around 4 hours. Is the drop appropriate for the bather load with a pool temp of 90 or do I need to keep my SWG percentage at 45%? Finally, can I offset the drop in FC after swimming for the day by simply adding bleach and if so, how much? Thanks!
    15 K gal/gunnite, 600 gal attached SPA, Hayward: ProLogic, ColorLogic LED, Super II pumps, 400k BTU heater, StarClear cartridge filter for, SwimClear cartridge filter . Pentaire: booster

    http://www.troublefreepool.com/detai...l?hilit=corpus

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    JasonLion's Avatar
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    May 2007
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    Re: Pump time/heater and SWG percentage.

    If you change the pump run time you need to change the percentage setting proportionately but in the opposite direction to produce the same total amount of chlorine. So for example if you double the pump run time, you need to halve the percentage to produce the same total amount of chlorine. This is separate from finding the correct setting for the SWG.

    Swimming uses up chlorine, so no surprises there. You want to adjust the percentage setting so the FC level never goes below 3, which in this case means turning the percentage up a little. If you do find the FC level a little low, add some chlorine manually and also adjust the percentage so it won't happen again. If FC is below 3, raise it to at least 3, perhaps 4 to be safe. You can figure out how much bleach to use to do that with the Pool Calculator. See the link in my signature.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

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    Re: Pump time/heater and SWG percentage.

    So ill drop my percentage a bit while heating to compensate for a longer run time and add bleach to normalize after swimming. Thanks!!
    15 K gal/gunnite, 600 gal attached SPA, Hayward: ProLogic, ColorLogic LED, Super II pumps, 400k BTU heater, StarClear cartridge filter for, SwimClear cartridge filter . Pentaire: booster

    http://www.troublefreepool.com/detai...l?hilit=corpus

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