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Thread: Back again with LOW CYA!!!

  1. Back To Top    #1

    Join Date
    May 2007
    Location
    Round Rock, TX
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    525

    Re: Back again with LOW CYA!!!

    Looks like your CC is very high at 4.5
    Your PH is low at 7.0

    You need to adjust your PH back towards 7.6
    Then shock the pool until your CC is <= 0.5
    Then add CYA to get it back to 30-50.

    You can use di-chlor for shocking, but it is more expensive that bleach and stabilizer last time I checked.

    You could have been hit by what others are seeing on the forum where you FC drops to zero, then you CYA changes to CC. I've had this happen myself a couple times.

    hope this helps,
    dave

    P.S. - the pool calculator can give you all the proper amounts.
    15,500 gal, inground gunite pool with 7 ft spa, 2 speed pump 2hp/.33hp, 3/4 hp booster pump, Intermatic P1353 timer, AutoPilot SC-48, Sand filter with ZeoBest, Heater, that I never use . . .

  2. Back To Top    #2
    Butterfly's Avatar
    Join Date
    May 2007
    Location
    South Carolina
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    10,045

    Re: Back again with LOW CYA!!!

    First, use Borax to raise your pH (as it will have the least effect on TA).

    Second, shock. You can use the granular to help raise the CYA. Go to Jason's Pool Calculator, near the bottom, to determine how much CYA will be added based on your choice of chems.

    dave gave good advice
    TFP Moderator TF100 Test Kit TF100 TestKit YouTube Channel PoolMath
    You're done SLAMing when:
    1)You lose 1ppm or less FC overnight, & 2)You have .5ppm CC's or less, & 3)your water is clear.

    ~ One should not use a sledge hammer to swat a mosquito. ~

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  3. Back To Top    #3

    Join Date
    Mar 2007
    Location
    San Rafael, CA USA
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    12,085

    Re: Back again with LOW CYA!!!

    Quote Originally Posted by lovingHDTV
    You can use di-chlor for shocking, but it is more expensive that bleach and stabilizer last time I checked.
    As I describe in Cost Comparison of Cyanuric Acid (CYA) Sources, Dichlor can be economical when one wants to add both chlorine and CYA. It's only more expensive if one wants the CYA without the additional chlorine.
    16,000 gallon outdoor in-ground 16'x32' plaster pool; Pentair Intelliflo VF pump; Pentair IntelliTouch i9+3s control system; Jandy CL-340 square foot cartridge filter
    12 Fafco solar panels; Purex Triton PowerMax 250 natural gas heater (200,000 BTU/hr output); automatic electric pool safety cover; 4-wheel pressure-side "The Pool Cleaner"

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