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Thread: SLAMing with no CYA

  1. Back To Top    #1

    Join Date
    Jun 2015
    Location
    VA
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    3

    SLAMing with no CYA

    Pool guy opened our pool on Tuesday and it's a swampy mess, so I've begun to SLAM it. I had to do that at the beginning of last season too to get it cleaned up.

    This time, however, our CYA level is absolute 0.

    The Pool School info on CYA says that "After adding CYA you should leave the pump running for 24 hours and not backwash/clean the filter for a week." The packaging for the conditioner I bought tonight says no backwashing for at least 48 hours. Meanwhile, the SLAM has me backwashing every few hours as our PSI climbs.

    Should I stick with the CYA of 0 for now and wait until the SLAM is complete before worrying about the CYA level?

    (I also bought the chemicals to raise the pH and TA and will begin administering tomorrow.)

    FC - 8
    pH - 7.0
    CYA - 0
    TA - 50
    CH - 300

    Appreciate any advice!
    25+ year-old 33K gal, plaster, sand filter, polaris

  2. Back To Top    #2
    Texas Splash's Avatar
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    Jun 2014
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    South-Central Texas, Marion/San Antonio
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    12,981

    Re: SLAMing with no CYA

    If you are able to hold some FC through the day to rule-out ammonia, then increasing CYA is a must - to a target of 30. Your pH is fine for now, and no need to mess with the other items either. So add some stabilizer now.
    To increase CYA via granular stabilizer, place the required amount as calculated by the Poolmath calculator into a white sock and place in the poolside skimmer basket. For those concerned about suction flow to the pump, suspending the sock near a return jet or from a floating device will also suffice. Best never to allow undissolved granules to rest directly against the pool surface. Squeeze the sock periodically to help it dissipate. Once dissolved, consider your CYA adjusted to that programmed (target) level. CYA test readings should show a rise in 24-48 hours, however some pools may experience a longer delay to fully register. Best to confirm final CYA in about 5-7 days before adding any more stabilizer/conditioner.
    As soon as that sock is soaking, assume your water (CYA) will make it to 30 and increase your FC to 12 then continue your SLAM. Hope that helps.
    Pat (a.k.a. Texas Splash) ~ My Pool: Viking Fiberglass; 17,888 Gal; Waterway Supreme 2-sp/2-hp pump; Hayward Ctg filter; TF-100 w/ Speed Stir
    Vital Links: POOL SCHOOL, RECOMMENDED LEVELS, RECOMMENDED CHEMICALS, Poolmath Calculator, SLAM, Chlorine/CYA CHART.
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  3. Back To Top    #3

    Join Date
    Jun 2015
    Location
    VA
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    3

    Re: SLAMing with no CYA

    Thanks! My base filter pressure is 20 psi. If it goes up to 28-30, should I go ahead and backwash, ignoring the conditioner instructions? Or just let it run at that pressure for the minimum 48 hrs?
    25+ year-old 33K gal, plaster, sand filter, polaris

  4. Back To Top    #4

    TFP Guide
    Mr Bruce's Avatar
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    Mar 2014
    Location
    Greenville, SC
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    1,798

    Re: SLAMing with no CYA

    You should backwash at + 25% or at 25psi for your filter/gauge.
    32K gallon Plaster - 1hp Hayward 2 speed Super Pump - Hayward S200 Sand Filter - TF100XL
    Test Kits - Pool Math - Chlorine/CYA/Target/Slam Chart

  5. Back To Top    #5
    Pool Tool's Avatar
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    May 2014
    Location
    Western Chicago Area, IL
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    754

    Re: SLAMing with no CYA

    By hanging the stabilizer in a sock, it dissolves before it gets to the filter and won't be flushed out during a backwash.

    16' x 32' (21100 gal), vinyl, 1.5 hp Hayward SuperPump,
    Tagelus TA60/60D Sand Filter, Raypak 399K Digital Heater, TF-100

  6. Back To Top    #6

    Join Date
    Jul 2013
    Location
    Long Island, NY
    Posts
    445

    Re: SLAMing with no CYA

    you MUST open your pool earlier than June. I'm in NY and mine is open in April. Obviously it stays open for a good month before we go in but that avoids the swampy mess
    Location: Long Island, NY
    Gallons: 5000 Gallons
    Pool: 15' Saltwater 5000
    Filter: Pentair 1 HP Optiflow Pump w/ Clean & Clear 75Sq Ft Cartridge Filter
    SWG: Intex CS8110

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