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Thread: Should I shock?

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    Join Date
    May 2010
    Location
    Lehigh Valley, Pennsylvania
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    71

    Should I shock?

    I was away for the week and left my wife in charge of adding bleach. She was somewhat lax on the adding bleach schedule. Came back and had a slight algae issue. Along the bottom of one side of the pool where the wall meets the floor for about half the length of the pool there was algae in the crevice and a few other small areas on the walls. The water was clear though. I vacummed, brushed and added chlorine. I did not shock. This was on Wednesday. There has been no sign of anything since. Water is clear and sparkly. Just wondering if there is a hidden enemy waiting. Do you have to shock or is it possible it was caught early enough and I took care of it with my procedure. Overnight FC loss looks pretty normal ~ 0.5 ppm loss.
    25K gal vinyl inground, 1HP Hayward Pump, Hayward DE 4820 Filter

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    duraleigh's Avatar
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    Apr 2007
    Location
    Sebring, Florida
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    30,077

    Re: Should I shock?

    If you have ANY visible algae left, you need to shock.

    You do not need to shock if....
    1. Your pool water is sparkling
    2. Your CC's are .5ppm or less
    3. You can hold your FC overnight without losing more than 1ppm.

    Couldn't tell for sure from your post but it sounds like you no longer need to shock.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    svenpup's Avatar
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    Nov 2009
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    Sacramento, CA
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    835

    Re: Should I shock?

    The rule is to shock if you have algae, or CC ≥ 0.5, or overnight FC loss ≥ 1.0

    It sounds like you are OK, but I would have brought it to shock level as soon as I saw the algae. What is your FC, CC, CYA?
    TFP Method Advanced Intermediate
    • 17,500 gallons - In Ground - Plaster - Hayward Swimclear 3020 Cartridge Filter - Sta-Rite Max-E-Glas Main Pump upgraded with A.O. Smith B2980 E-Plus New Centurion Two-Speed Motor - Polaris 280 Cleaner with Polaris PB4-60 Booster Pump - TightWatt2 Timer - Taylor K-2006 Test Kit - Pool Pilot Digital Nano SWCG

    Helpful Links: Pool School, BBB for Beginners, How to Shock (hint...it's a process not a product), Chlorine/CYA Chart, Jason's Pool Calculator

  4. Back To Top    #4

    Join Date
    May 2010
    Location
    Lehigh Valley, Pennsylvania
    Posts
    71

    Re: Should I shock?

    FC - ~4
    CC- 0-0.5
    CYA~45

    Based on the previous two posts, sounds like I am okay.
    25K gal vinyl inground, 1HP Hayward Pump, Hayward DE 4820 Filter

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