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Thread: can I let FC drop?

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    Join Date
    Jul 2012
    Location
    Whidbey Island, WA
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    392

    can I let FC drop?

    good evening
    pool not closed and water is getting coooold
    water looks fine
    CYA is 30-40 and PoolMath FC range is 3-7
    can I now run at the low end of the FC range?
    thank you
    IG under fir trees and one cherry surrounded by grass built in 1979, 30k, plaster, old Sta-Rite HRPB30, 4.9 sq.ft, 20 GPM/sq.ft., but with new glass, new (in 2012) 1 HP WhisperFlo one speed, new (in 2013) Rainbow tab chlorinator attached at the top, old Maxi-Flo Heat Exchanger MF-260, Burnham V7 oil heater 245 MBH, new (in 2012) Compool to Easytouch, Taylor K-2005 and TF-100.

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    Mod Squad JVTrain's Avatar
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    Feb 2014
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    Central Minnesota
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    Re: can I let FC drop?

    You can always run at the lower end of the range, just make sure it never drops below minimum and keep steady with your testing despite likely lower chlorine demand.
    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
    Isolated Spa - 345 Gallons

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    Join Date
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    Whidbey Island, WA
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    Re: can I let FC drop?

    Quote Originally Posted by JVTrain View Post
    You can always run at the lower end of the range, just make sure it never drops below minimum and keep steady with your testing despite likely lower chlorine demand.
    thank you, will do

    demand is pretty low
    added gallon 10% on 10/23
    was FC 8 the next morning
    and today (11 days later) FC 4.5
    IG under fir trees and one cherry surrounded by grass built in 1979, 30k, plaster, old Sta-Rite HRPB30, 4.9 sq.ft, 20 GPM/sq.ft., but with new glass, new (in 2012) 1 HP WhisperFlo one speed, new (in 2013) Rainbow tab chlorinator attached at the top, old Maxi-Flo Heat Exchanger MF-260, Burnham V7 oil heater 245 MBH, new (in 2012) Compool to Easytouch, Taylor K-2005 and TF-100.

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