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Thread: Chem Levels Min/Max

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    kenmar's Avatar
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    Chem Levels Min/Max

    This question might be best answered by Chemgeek or Jason.

    As you may know, I am writing a pool testing app for Droid phones (SimplePool.)
    Currently, I am not validating users input.
    As such, a person could enter a value that is wildly unrealistic (pH of 2, FC of 500, etc.)
    I would like to limit users to entering only reasonable numbers.

    Can you tell me what are reasonable min/max values (values that either are at the limits of testing, practicality, or safety) for the following measurements?

    FC
    CC
    pH
    TA
    CYA
    CH
    TDS
    Salt
    Borates

    Again, I am not looking for normal ranges, but the min/max value a person may reasonably be able to measure/enter.

    Thanks so much,

    -Ken-
    20'x40' / 30,000 Gal / In Ground / Vinyl
    Pentair FNS 48 DE Filter / Pentair Challenger 1.5 HP Pump
    Jandy Lite2 400k BTU Propane Heater / Dolphin Dynamic cleaning robot
    TF-100 Test Kit / BBB
    Creator of SimplePool (BBB Friendly Android App) http://www.simplepool.net

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    Richard320's Avatar
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    Re: Chem Levels Min/Max

    Well, I'm not Jason or chemgeek, but from my own history and some opinion..

    FC should go to 50, the max the FAS-DPD can test
    pH, I'd look at the various brands of test kits and test strips, and go with the min and max you see there
    TA, I've personally had over 200, can't remember what it was exactly
    CYA, by dilution, I got between 220 and 240. That's very easy to reach if the previous owner fed it a steady diet of pucks. I'd go to 300 at least
    CH: I've hit 1100 before. I imagine places like Las Vegas or Needles could go even higher.
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
    Troublefree does not mean Maintenancefree. It's like brushing your teeth: You can spend a couple minutes a day and pennies a week or go to the dentist once a year and spend several thousand dollars.
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    frogabog's Avatar
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    Re: Chem Levels Min/Max

    My rain ph is very low, so allowing the app to plug in numbers below test kit numbers would be nice if say, I wanted to play with raising the rain's ph (don't ask me why I'd do that, I probably wouldn't. I just wouldn't want to be limited). I like how the pool calculator allows me to enter values down to zero on everything.

    Max values is another story. However with chlorine, one could use the calculator for anything one wanted to add chlorine to and 50ppm is high for a pool but it isn't for cleaning purposes. Being able to calculate small volumes if one wanted for just about any reason is nice.
    Where kids swim in 54 degree water, turn blue, and giggle happily cuz they got a POOL!
    Year 3 BBB -15' x 48" Intex Metal Frame - Was using (2) 1000gph Intex cartridge filters (see Full time pumping Intex). 2012, converted to 1600gph and sand filter+SWG = Sand filter love affair!
    Don't waste time and energy looking for a better value on test kits, the TF100 is the best deal around. I did the looking and spent the extra money, but you don't have to make the same mistake. Just go here: TFTestkits. I use Pool Calculator for min/max, and shocking chlorine levels.

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    JasonLion's Avatar
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    Re: Chem Levels Min/Max

    One of the central problems is that extreme situations do occur occasionally. This doesn't happen very often, but it is nice to allow for them somehow.

    FC 0-40 extreme:80
    PH 6.4 to 8.6 extreme: 4 to 10
    TA 0-200 extreme 400
    CH 0-800 extreme 1400
    CYA 0-200 extreme 400
    Salt 0-5500 extreme 40,000
    Borates 0-80 extreme 120
    TDS - ignore completely, but 0-6,000 extreme 50,000
    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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    kenmar's Avatar
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    Re: Chem Levels Min/Max

    Thanks to all who answered,

    Jason: this is exactly what I was looking for!
    20'x40' / 30,000 Gal / In Ground / Vinyl
    Pentair FNS 48 DE Filter / Pentair Challenger 1.5 HP Pump
    Jandy Lite2 400k BTU Propane Heater / Dolphin Dynamic cleaning robot
    TF-100 Test Kit / BBB
    Creator of SimplePool (BBB Friendly Android App) http://www.simplepool.net

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