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Thread: Adding CYA, all at once or in 2 steps?

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    Adding CYA, all at once or in 2 steps?

    I just drained and refilled my pool to fix high CH problem. When I refilled the pool I checked water meter at start and finish, so know the volume.

    According to PoolMath, to get CYA to 70 for my SWG pool I should add 3 lbs, 14 oz.

    I added the first 3 lbs via sock in front of return method yesterday, which should take it to 54.

    My question is, do I need to wait a week, test the results, and then add the remaining CYA?

    Or can I just add the remaining 14 oz today (while monitoring pH) and trust PoolMath that it will go to the right amount?

    Don't want to get my CYA too high, but I trust my ability to weigh the CYA more than my eyes to read the results of the test.

    Thanks,
    6640 gallon outdoor in-ground 8x26 pebble pool, 3'-5' deep, Pentair IntelliFlo Variable Speed pump, Jandy CL580 Cartridge Filter, Jandy AquaPure 1400 SWCG

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    Mod Squad jblizzle's Avatar
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    Re: Adding CYA, all at once or in 2 steps?

    How much water did you replace? How sure are you of the volume of the pool?

    I think I would wait a week, retest and then add more.
    Jason, TFP Moderator
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  3. Back To Top    #3

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    Re: Adding CYA, all at once or in 2 steps?

    I drained it completely so I replaced all of the water.

    I am pretty sure of the volume since I used the water meter at the street at start and finish of refill.
    6640 gallon outdoor in-ground 8x26 pebble pool, 3'-5' deep, Pentair IntelliFlo Variable Speed pump, Jandy CL580 Cartridge Filter, Jandy AquaPure 1400 SWCG

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    Mod Squad jblizzle's Avatar
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    Re: Adding CYA, all at once or in 2 steps?

    Well, then PoolMath should give you the right amount to add ... it is not like going a little over 70ppm is a big deal anyway.
    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
    Pool School + Test Kit + PoolMath = A TROUBLE FREE POOL
    If you found TFP helpful and we saved you money ... Become a TFP Supporter!

  5. Back To Top    #5

    Join Date
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    Re: Adding CYA, all at once or in 2 steps?

    The other thing, is according to this post:
    http://www.troublefreepool.com/threa...l=1#post203524

    The accuracy of the test, is plus or minus 15. So if my first addition takes me to 55, the test results could give me 40 to 70.

    So I figured it would be more accurate knowing the volume, to just trust PoolMath.
    6640 gallon outdoor in-ground 8x26 pebble pool, 3'-5' deep, Pentair IntelliFlo Variable Speed pump, Jandy CL580 Cartridge Filter, Jandy AquaPure 1400 SWCG

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