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Thread: Safe to swim once below shock level. Source?

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    Join Date
    Jun 2008
    Location
    Wichita, KS
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    22

    Safe to swim once below shock level. Source?

    First off, I've been around here for a couple of years and this site is BY FAR the best place to get great info regarding pool care!

    That being said, I've seen the recommendation regarding maximum safe FC levels used quite a bit - that being it is safe to swim in a pool once the FC level has dropped to below shock level. The question I have is: why? I'm curious as to whether there is evidence of harm to swimmers above that level or if it's merely a rule of thumb. I've heard of eczema sufferers whom benefit from 'bleach baths' where the FC level is, presumably, much higher than what is normally seen in a pool. So on the surface, there seems to be a bit of a conflict. So beyond the possibility of ruining a bathing suit sooner or the like, what's the harm?
    10k gal. IG vinyl, 1 hp pump, 200 lb sand filter, solar panels & cover

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    JasonLion's Avatar
    Join Date
    May 2007
    Location
    Silver Spring, MD
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    37,879

    Re: Safe to swim once below shock level. Source?

    Many people swim at far higher active disinfecting chlorine levels all the time in indoor pools, because those pools don't have any CYA in them. However, various things start going wrong. At higher active chlorine levels there is hair damage which can cause frizzy hair, or in extreme cases cause hair to break off completely. Many people report skin irritation at higher active chlorine levels. Plus, bathing suits fade and elastic fails at these higher levels. The recommendation we make, FC below shock level, includes a large safety margin below the levels at which these effects are commonly reported.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

  3. Back To Top    #3

    Join Date
    Jun 2008
    Location
    Wichita, KS
    Posts
    22

    Re: Safe to swim once below shock level. Source?

    Got it. Thanks!
    10k gal. IG vinyl, 1 hp pump, 200 lb sand filter, solar panels & cover

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