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Thread: Off the Charts FC

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    Off the Charts FC

    I had some yellow algae on the side of my pool and the CYA was 85. I drained some water and started the SLAMING. However, I added enough bleach to get the FC to 35 using the "previous" CYA number, not the CURRENT CYA! My FC is now reading 235!!!! What should I do?
    DeeDee
    24Kgal/IG/Pebble/525sq.ft.CartridgeFilter/1.5 HP Pump/Built 2012

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    Mod Squad pooldv's Avatar
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    Re: Off the Charts FC

    The FAS/DPD chlorine test is only good for measuring FC up to 50 ppm. It would take 69 jugs of 8.25% bleach to get your FC to 235. Are you sure you added 69 jugs of bleach to your pool?
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    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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    Pool Tool's Avatar
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    Re: Off the Charts FC

    Previous or new CYA number doesn't affect FC readings. They are not directly related, only use the CYA to estimate your FC range.

    Can you shed details on your additions?? How did you test FC @ 235 ppm??
    16' x 32' (21100 gal), vinyl, 1.5 hp Hayward SuperPump,
    Tagelus TA60/60D Sand Filter, Raypak 399K Digital Heater, TF-100

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    Re: Off the Charts FC

    No, I added 6 gallons of bleach.
    I used my TF100 test kit and it took 47 drops of R-0871 to get it clear, and then I multiplied it by 0.5
    My CYA is now 50.
    DeeDee
    24Kgal/IG/Pebble/525sq.ft.CartridgeFilter/1.5 HP Pump/Built 2012

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    Mr Bruce's Avatar
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    Re: Off the Charts FC

    That's 23.5. Slightly over SLAM value, no reason to worry, much less panic.
    32K gallon Plaster - 1hp Hayward 2 speed Super Pump - Hayward S200 Sand Filter - TF100XL
    Test Kits - Pool Math - Chlorine/CYA/Target/Slam Chart

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    Re: Off the Charts FC

    Oh my goodness!! I forgot to add my decimal...DUH!!!
    Thank you!!
    DeeDee
    24Kgal/IG/Pebble/525sq.ft.CartridgeFilter/1.5 HP Pump/Built 2012

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    Mod Squad pooldv's Avatar
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    Re: Off the Charts FC

    LOL! Alright, glad we got that sorted out. SLAM on!
    TFP Moderator
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    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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    Susiejax's Avatar
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    Re: Off the Charts FC

    No worries! Keep going! Keep on brushing and filtering. You'll get there.
    22,400 gal; in-ground gunite rectangle, vinyl liner; 3.5'-8' depth; Chlorine; auto cover; Hayward Pump and Sand Filter; Hayward Electric Heatpro; diving board; 3 sidewall fountains; open mid May thru mid October; built 2011; Taylor K-2006C FAS-DPD Test Kit

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    Re: Off the Charts FC

    Just remember not to quit until your SLAM is complete, and it takes more than one day.

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