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Thread: Why Do SWG Pools Have Lower FC Recommendation for Same CYA?

  1. Back To Top    #1

    Join Date
    May 2015
    Moorpark, CA

    Why Do SWG Pools Have Lower FC Recommendation for Same CYA?

    I have looked everywhere, and have not found any reason why a SWG pool would have 2-3 ppm lower FC recommendations for Minimum and Target than a non-SWG pool for the same CYA. Can anyone give me an explanation?

    20,000 gallon in-ground gunite/plaster pool (1992), attached spa with spillway, Pentair Superflo 1.5 HP pump, Smith booster pump for pool sweep, Pentair 2000 DE filter, Sta Rite Max-E-Therm 400 heater, Silencer Blower 2 HP for spa, Polaris 280 pool sweep.

  2. Back To Top    #2

    TFP Guide

    Join Date
    Jul 2015
    Central Valley CA

    Re: Why Do SWG Pools Have Lower FC Recommendation for Same CYA?

    Because a SWG pool is dosed over a longer period of time and avoids the bottoming out of a single dose that has to wait 24 hours before it is brought up again. Think of it as time released medicine so you can get away with slightly lower over all.


    The same can be done with Stenner systems with either long dose times or a few doses through out the day.
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  3. Back To Top    #3
    Mod Squad jblizzle's Avatar
    Join Date
    May 2010
    Tucson, AZ

    Re: Why Do SWG Pools Have Lower FC Recommendation for Same CYA?

    The lower recommendation is partly what atttech-2 said (I disagree with the Stenner comment though).

    The other part is the "harsh" environment within the cell why generating.

    BTW, the SWG just has a lower minimum FC level than other types of chlorination.
    Jason, TFP Moderator
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