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Thread: Brain Fog & FC Expectations with Poolmath

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    Join Date
    May 2015
    River Falls, WI

    Brain Fog & FC Expectations with Poolmath

    Iím trying to reign in my Poolmath calculations by adjusting gallons used and doing a kind of trial and error approach. Iíve been capturing FC expectations over the past few days and doing retests about 45 minutes after any additions of bleach, while the pump is running. Iíve been using the 25 mL sample for a little better accuracy. I know Iíll burn through a bunch of reagents but thatís ok. I have an XL option and no pool to slam. Thank you TFPC! My hopes are that I can dial in a bit better pool size and so my chemical additions are pretty close. Right now it seems Iíve been overshooting my FC expectations sometimes by 1.5ppm. I just want to get a little closer.

    If I put in bleach and overshoot my FC ppm expectation should I increase or decrease my gallons?

    Iím having an internal struggle with which way to adjustÖ

    Thanks and sorry for a stupid question, but itís tormenting me...
    ~19k Gal, IG Vinyl, Hayward SP2607X10 1hp pump, Hayward S200 Sand Filter, built in Ď70ís, has 8í deep end with diving board, 1 skimmer, 1 return, 1 low hole, Polaris booster pump PB4-60, old Polaris robot not sure model, Rheem P-M266A-EN-C 266,000 BTU heater, solar cover, Taylor K-2006 test kit, Speedstir

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

    Re: Brain Fog & FC Expectations with Poolmath

    If you're overshooting the target, you are assuming your pool volume is TOO HIGH. It's actually lower volume.

    You can trial and error this by inputing your FC before adding in the Now column, the actual FC you got after testing later in the Target column. Wiggle the Pool Volume ("Size") cell downward until the volume of bleach in the calculator column matches what you actually put in for bleach volume.
    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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