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Thread: When to shock??

  1. Back To Top    #1

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    When to shock??

    This may be a dumb question, but when would I need/want to shock my pool with high amounts of CL??

    Is the answer: When I set green things floating or a tinge of green in the water ??

    In the summer, someone on here said they shock once a week... EEEK!!

  2. Back To Top    #2
    JasonLion's Avatar
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    I shock if the pool is green, or if the CC level is above 0.5, or if I mess up and the FC level goes to zero.

    The "conventional wisdom" on shocking weekly is based on the assumption that you haven't taken care of the pool during the week so you better shock before swimming.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
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  3. Back To Top    #3

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    Hehehe.. ok.. My friend shocks his pool weekly and uses aglicide and doesn't do much else. He tests weekly. He also uses hella Diclor and doesn't know why I'm sure.. *shakes head*



    Thanks for the info, now know I what to test for.. Once my TF100 test kit arrives..

    Regards,
    Kevin

  4. Back To Top    #4
    Guest
    Shock when the CC is above .5 ppm, after a heavy rain, after heavier than normal pool use, or when the water has a 'chlorine smell' (that's the CC you smell) or looks cloudy.

  5. Back To Top    #5

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    Would I ever want to shock it when CC is less than 0.5ppm?

    (CC should ideally be 0 all the time, right?)

  6. Back To Top    #6
    JasonLion's Avatar
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    Ideally CC should be zero but it isn't usually worth bothering getting it to exactly zero. When the FAS-DPD test reads 0.5 what it really means is that CC is above 0 and not higher than 0.5. The great majority of the time it is actually much closer to zero than it is to 0.5. You can also do the test so each drop is 0.2, in which case you want to keep CC at 0.2 or lower.

    CC starts being detectable by people around 0.3 or 0.4. So it is possible for the test to show 0.5 and for CC to be a problem. This is very uncommon in outdoor pools, where CC tends to go towards zero because of sunlight, but much more likely in indoor pools.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
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  7. Back To Top    #7

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    Shocking is basically for when the pool is green, or perhaps cloudy with a green tint starting to emerge.

    If a pool is properly maintained on a regular basis, ideally you should never have to increase FC to high shock levels. Sometimes it can't be helped... like you go on vacation.
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  8. Back To Top    #8
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    Quote Originally Posted by rimshaker
    Shocking is basically for when the pool is green, or perhaps cloudy with a green tint starting to emerge.

    Not all the time. sometimes it's a preventative measure, such as doing it after heavy rains or unusually high bather load.

    If a pool is properly maintained on a regular basis, ideally you should never have to increase FC to high shock levels. Sometimes it can't be helped... like you go on vacation.
    I wouldn't say never but I would say that it's a rare occurance!

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