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Thread: Indoor Pool Shock

  1. Back To Top    #1

    Indoor Pool Shock

    We had a FC reading of 2 and a CC reading of 3 on a 100,000 indoor pool with a great ventilation system. Yesterday, we added 10lbs of cal-hypo as we attempted to raise the FC to 10 to break point chlorinate and only reached a 7.5 today with CC of 1.75 after 22 hours. We cannot use CYA and never have. We shock at most annually, sometimes less for CC alone. Water is always clear as glass.

    Now what?

    We could add 4-5lbs more to reach the original goal of 10 FC, but will that help achieve the goal of 0 CC at this point? - I don't need to pool this week, but it's in use on the 15th.

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    Isaac-1's Avatar
    Join Date
    May 2010
    SW Louisiana

    Re: Indoor Pool Shock

    First of all there is no such thing a break point chlorination, it is a myth started by bad science backed up by bad math 40+ years ago.

    Next question is do you use any type of supplemental oxidation (ozone, UV or MPS)? If you use MPS chlorine free shock it shows up as CC on the standard test which may be part of your issue. If you don't use some type of supplemental oxidation, maybe you should consider it, particularly if you are banned by outdated regulation there from using any CYA.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
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  3. Back To Top    #3

    Re: Indoor Pool Shock

    We use only cal hypo. Nothing else.

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