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Thread: Balancing Order

  1. Back To Top    #1

    Join Date
    Jun 2009
    Toms River, NJ

    Balancing Order

    I sure this has been asked before, but I'm curious, and pose the following hypothetical situation. All of your test numbers are out of whack. What do you handle first?

    I ask this question partly because I fully expect my numbers to be very wrong (given I was using the pool store as my tester, and I was taking water from the very top of the pool), but mostly because I know adding some chemicals to address one issue often after another (such as adding CYA affecting TA).

    (Some hypothetical numbers)

    10,000 gallons, vinyl, SWG

    FC: 1
    CC: 0
    pH: 8.0
    TA: 150
    CYA: 10
    CH: 30
    Salt: 2200
    Borate: 10
    Temp: 62 degrees F

    Given my limited knowledge but extensive reading here over the past few weeks, I'd do things in the following order:

    Lower pH (which will also lower TA)
    Add Chlorine (using Cal-Hypo)
    Add CYA
    Lower TA (if necessary)
    Add Calcium
    Add Salt
    Add Borates

    Testing in between steps, of course. How does that sit?
    45,180 gallon 26' x 53' IG Vinyl, irregular shape. Hayward sand filter / pump. Polaris AutoClear SWG, supplemented with a Hayward Automatic Chlorinator (In-Line). Hayward 400K BTU heater. Paramount "turnover" system. Polaris 480 PRO cleaner.

  2. Back To Top    #2

    Join Date
    Feb 2008
    Denton, TX

    Re: Balancing Order

    That sounds pretty good to me.

    CYA addition shouldn't affect your TA, but it can lower your pH a little bit. Also, maintaining a certain calcium hardness in a vinyl lined pool isn't quite as important as it would be for a concrete pool, but you can do it. And if you are using cal-hypo to chlorinate, be very watchful about your CH levels as cal-hypo can run up the CH pretty quickly. Not so important from a liner perspective but if the CH gets very high, it could make problems for your other equipment (heater) from a scaling perspective.

  3. Back To Top    #3
    JasonLion's Avatar
    Join Date
    May 2007
    Silver Spring, MD

    Re: Balancing Order

    As a general rule, you want to adjust PH and FC right away, then start working on TA, CYA, and salt, then CH, then borates. Most of the time the adjustments can actually be done in any order, but there are a few cases where things are interdependent.
    Here are the most important interactions:
    • You don't want to add CH on the same day as doing anything which raises the PH.[/*:m:2yc4mghz]
    • If TA is below 50, adjust TA before adjusting PH, unless PH is also really low in which case raise both at once with soda ash/washing soda.[/*:m:2yc4mghz]
    • Insure that CYA is between 30 and 80 before shocking the pool.[/*:m:2yc4mghz]
    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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