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Thread: shock or not to shock

  1. Back To Top    #1

    Join Date
    Dec 2009
    Location
    Columbia, SC
    Posts
    34

    shock or not to shock

    First I am very new to the BBB, checked water on Monday:
    ch:240
    ph: 7.5
    fc: 7.5
    cc:.5
    ta: 170
    cya:90

    did a drain/refill

    CH:240
    PH: 7.2
    fc: 1
    cc:1
    cya: 70

    last night about two hours after adding the bleach

    fc:7
    cc:1

    this morning before the sun was on the pool
    fc:5
    cc:1

    Should I shock? How do I know how much bleach to add to get it to shock level? I saw that somewhere on here but I can't find it now. Water is pretty clear. If I am to shock how long before we can swim? Thanks for all the help, I will get the hang of this.
    18k gallon in ground plaster with attached spa
    Pentair CCP 320 cartridge filter
    Goldline Aqua Rite SWG
    IntelliFlo VS pump
    Teledyne Laars ESC heater
    Hayward Pool Vac Ultra cleaner w/ skimmer Vac Plate and inline leaf basket
    Palm Springs, CA

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    Mod Squad woodyp's Avatar
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    Apr 2010
    Location
    East Texas
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    9,004

    Re: shock or not to shock

    Pool school has the CYA/chlorine chart you need for shock level. And yes, you need to shock. Start at dark. Read the shock section in pool school as well.
    16x32x52" Steel Cornelius Miramar AGP Vinyl liner 13,100 gal. Buried 2 ft.
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    svenpup's Avatar
    Join Date
    Nov 2009
    Location
    Sacramento, CA
    Posts
    835

    Re: shock or not to shock

    CYA/chlorine chart will tell you your target level, but use Pool Calculator (link in my signature) to determine actual amounts of chemical needed. Set suggested goal levels at the bottom, size in gallons, and enter then enter "now" and "target" for each parameter and pool calc tells you how much of each chemical to add.
    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
    Dec 2009
    Location
    Columbia, SC
    Posts
    34

    Re: shock or not to shock

    I just put in 985 oz of bleach to shock level. From what I read I check the FC in an hour and then I check it an hour later. How many times do I do this? I know I have to keep the FC to 28 but I am not sure for how long?
    18k gallon in ground plaster with attached spa
    Pentair CCP 320 cartridge filter
    Goldline Aqua Rite SWG
    IntelliFlo VS pump
    Teledyne Laars ESC heater
    Hayward Pool Vac Ultra cleaner w/ skimmer Vac Plate and inline leaf basket
    Palm Springs, CA

  5. Back To Top    #5

    Join Date
    Apr 2009
    Location
    Northeast Ohio
    Posts
    221

    Re: shock or not to shock

    You should maintain shock level:

    1) Until your overnight FC loss is 1 ppm or less;
    2) and your CC is .5 ppm or less;
    3) or (if you're not using an FAS-DPD test kit), your pool is sparkly clear.

    You should test and bring your level back up to shock level hourly if you can, until it's starting to stay fairly high, then you can cut back to 2 or 3 times per day.
    32x16 ft Grecian rectangular vinyl pool 8ft on deep end - 19000 gal. 18" Hayward S-240 sand filter. 250K BTU Pentair MasterTemp heater. Hayward 3/4 HP Super Pump.

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