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Thread: Effects of adding fill water calculator

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    Effects of adding fill water calculator

    I was thinking the other day how a calculator like that would help me figure out where my TA was going to go after adding a few inches of fill water. For informational purposes I would have used it since I knew my TA was going to go up. Input your current test results, fill water test results and gallons of fill. How does that sound for a suggestion?
    18,000 Gallon Aboveground. Sand Filter with 2HP 2 speed Pump.

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    Re: Effects of adding fill water calculator

    Does anyone know the math formula for calculating such a task? Ive tried to work it out on paper but nothing seems to make sense.
    18,000 Gallon Aboveground. Sand Filter with 2HP 2 speed Pump.

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    Mod Squad jblizzle's Avatar
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    Re: Effects of adding fill water calculator

    For most chemicals it is just a ratio. If you replace 25% of the water:
    New level = 0.75*pool level + 0.25*fill level
    Jason, TFP Moderator
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    Re: Effects of adding fill water calculator

    Thanks for the reply. I came up with a formula before you replied that looks the same as what you replied with. I made a javascript calculator with this formula:

    Total Gallons = Pool Gallons + Fill Gallons

    Pool Gallons / Total Gallons = A
    A x pool TA ppm = B
    Fill Gallons / Total Gallons = C
    C x fill TA ppm = D
    B + D = Final TA ppm when mixed

    Does that look right to you? I am willing to share the calculator with the community here so people will have an idea of what happens when fill water is added to their pool.
    18,000 Gallon Aboveground. Sand Filter with 2HP 2 speed Pump.

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    Mod Squad jblizzle's Avatar
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    Re: Effects of adding fill water calculator

    Looks right to me.
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
    500 sqft Heliocol solar panels, ThePoolCleaner, TF-100 test kit w/ SpeedStir
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    svenpup's Avatar
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    Re: Effects of adding fill water calculator

    To circle back on what jblizzle said in post 3, if you are replacing water, The "Pool Gallons" in you equation is after draining.
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    Re: Effects of adding fill water calculator

    I have the calculator made. Had to redo the equations since they got deleted somehow. Anyone interested in checking it out for flaws or suggestions?
    I need some people to check it out. Im sure I will tinker with it some more. Where would I need to put it?
    18,000 Gallon Aboveground. Sand Filter with 2HP 2 speed Pump.

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