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Thread: CYA High in SoCal

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    Join Date
    Jun 2016
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    Encinitas, CA
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    CYA High in SoCal

    I just got my TF-100 this weekend and as expected my CYA levels are high. My last few pool store tests had the CYA anywhere between 120-140. I have tested my CYA levels three times since I got my kit this Saturday and all three tests were right around 100 (used dilution method once). Last week my heater started leaking so I had a few days without running my equipment. My FC levels dropped to .7. I started to get a little algae on the sides of the pool. I have since got my FC levels up but I can see some algae when brushing the pool. Can or should I shock the pool with such high CYA numbers?

    I am new to the forum but saw a recommended FC chart for SWG with high CYA levels but have not been able to find it again but i think with my levels of FC with a SWG my target should be around 9-10. Does that sound right?

    Latest test results:
    FC - 9.5
    PH - 7.6
    CH - 750
    TA - 70
    CYA - 100

    Again in drought SoCal so do not want to drain the pool if I don't have to. Any advice is greatly appreciated.
    Plaster, In Ground, 30K gallons (I think)
    Pentair Clean & ClearCCP420
    Raypak 2100 Heater
    Pentair WhisperFlo Pump
    Hayward TurboCell T-CELL-15

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    Mod Squad pooldv's Avatar
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    Re: CYA High in SoCal

    In the future if the pump or SWG isn't running for any reason keep adding bleach to maintain FC and brush to mix it. A SLAM is the only way to kill the algae, here is how, SLAM. And here is the FC/CYA Chart

    You do not have to drain, it is possible to manage your pool with CYA at 100, just maintain the correct FC above minimum at all times. CYA will drop a few ppm, 3-5, per month in its own. Keep in mind that the PH test is not valid when FC is above 10.
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    Isaac-1's Avatar
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    Re: CYA High in SoCal

    Doing a SLAM at this CYA level is possible, but not fun, if possible you should try to replace some of your pool water to lower CYA.
    Indoor 20x40 35,000 gallon vinyl pool with 1.5 HP 2 speed Jandy FloPro pump, Hayward EC75 Perflex DE filter, 11 4x12 Techno-Solis solar panels w/ Aquasolar controller, Aquabot Turbo T Robot Cleaner. Also LMI metering chlorine dispenser pump and HotSpring Jetsetter
    I use and endorse TFtestKits TF-100 from http://tftestkits.net
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    Join Date
    Jun 2016
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    Encinitas, CA
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    Re: CYA High in SoCal

    I checked my FC levels at 11pm last night and it was 9.5. Checked again at 7:30am this morning without running any equipment and the level were the same 9.5. Checked it again this evening after a full day of 90 degree sun (with blue bubble cover) and FC levels were down to 8.5 again with out running any equipment. If I am not having a significant loss over night how will i know when to end the SLAM?

    I still can't find the chart with the FC for CYA over 80 for SWG. I know it is here somewhere. Can anyone point me in the right direction?

    Based off the standard chart I would assume my shock FC levels need to be at 34. Does that sound right?
    Plaster, In Ground, 30K gallons (I think)
    Pentair Clean & ClearCCP420
    Raypak 2100 Heater
    Pentair WhisperFlo Pump
    Hayward TurboCell T-CELL-15

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    Mod Squad pooldv's Avatar
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    Re: CYA High in SoCal

    Use the shock level for non-swg, they are the same, FC/CYA Chart. There are 3 criteria to pass the SLAM here, SLAM. OCLT is one and you pass that.
    TFP Moderator
    If TFP helped you or saved you money - Become a TFP Supporter! <--Click here
    2012 build and pics, 20k gal gunite, black onyx pebblesheen, OK flagstone, IntellifoVS, cart filter w/Pleatco, IC40 SWG, Solartouch, 5 12'x4' solar panels, HP50HA heat pump, 8mil solar cover, borates, TF-100 test kit, SONOS, Doheny's Discovery Robot, hot tub on bleach

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