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Thread: Is it time to shock?

  1. Back To Top    #1

    Join Date
    May 2007
    Fayetteville, Arkansas

    Is it time to shock?

    At the beginning of the season I established my CYA at 50 and the water was brilliant with no algae. We've had a lot of rain of late, so the current CYA level has been reduced to 30. I've adjusted my daily additions of bleach accordingly, but with the daily checks and addition of the prescribed amount of bleach, I'm getting green algae bloom, particularly on the shallow end floor.
    The other numbers are: Ph 7.8, CC 0.0, TA 80 FC 2.5 (this evening's reading, down from 4 yesterday evening after bleach was added). Target for the this CYA level is 4, according to the chart. I'm thinking of running the CYA back up to 50 with the corresponding FC target level like before after a shocking.
    So - what'd'ya say?

    Thanks everyone!
    20x40 30,000 gal IG Liner, Pentair II Sand

  2. Back To Top    #2
    JasonLion's Avatar
    Join Date
    May 2007
    Silver Spring, MD

    Re: Is it time to shock?

    Yes, you need to shock. You can do that before or after raising the CYA level.

    At lower CYA levels it is easier for the FC to accidentally get too low.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
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