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Thread: What is the shock level for 0 CYA water?

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    UnderWaterVanya's Avatar
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    What is the shock level for 0 CYA water?

    This is a tad tongue in cheek... and not a pool related question. I have dog water bowls and cat water bowls that develop algae.

    The dog water bowl is outside and exposed to sunlight and has more capacity and is changed daily during the summer and less frequently in the winter. Algae builds up and I was curious what level of FC would be needed to shock it - should I elect to do so. Typically I just dump in a bunch of bleach.

    The cat bowl is inside and over time develops a weird pink algae despite being changed frequently - sometimes more than 1/day.

    FC levels run about 1.5-3ppm from the tap.

    I'm surprised the inside bowl gets nasty with the frequent changes - is 1.5ppm with zero CYA not enough?
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    Mod Squad Bama Rambler's Avatar
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    Re: What is the shock level for 0 CYA water?

    The issue is zero cya. With no cya the chlorine is gone in a matter of minutes in the sun. And once something starts growing even faster than that.
    Dave J. TFP Moderator
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    UnderWaterVanya's Avatar
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    Re: What is the shock level for 0 CYA water?

    Quote Originally Posted by Bama Rambler
    The issue is zero cya. With no cya the chlorine is gone in a matter of minutes in the sun. And once something starts growing even faster than that.
    Cat bowl is inside...

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    Inlaws Pool Boy since June 14th 2012, Pool built ~ 2003, In-Ground, 16'x32'
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    dmanb2b's Avatar
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    Re: What is the shock level for 0 CYA water?

    Pet's bowls should be washed daily. I usually just hand wash every evening before bed, but running through dishwasher would work too.
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    JasonLion's Avatar
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    Re: What is the shock level for 0 CYA water?

    With CYA really and truly at zero, shock level is between 2 and 5. Technically it is 2, but sometimes 2 ppm of chlorine gets used up really quickly, so you generally use more to be sure you really got it. If there has ever been CYA in the water then things are different and you use 10 as shock level.
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    UnderWaterVanya's Avatar
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    Re: What is the shock level for 0 CYA water?

    Quote Originally Posted by JasonLion
    With CYA really and truly at zero, shock level is between 2 and 5. Technically it is 2, but sometimes 2 ppm of chlorine gets used up really quickly, so you generally use more to be sure you really got it. If there has ever been CYA in the water then things are different and you use 10 as shock level.
    Thanks. My typical response when I notice the problem is to nuke it at many thousands of ppm but I was curious what the shock level was. If 2ppm is needed that makes sense as to why just refilling frequently (many times per day) is not difficult since fc trends too be 1.5 ppm in my tap water.

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    Inlaws Pool Boy since June 14th 2012, Pool built ~ 2003, In-Ground, 16'x32'
    13500 gal, Vinyl Liner, Fiberglass Slide, TF-100 Test Kit, Hayward 210T
    sand filter, A.O. Smith 1.5HP main pump motor (C48L2N134C1),
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    Re: What is the shock level for 0 CYA water?

    Off the subject of CYA but I use this for watering the dogs (two German Shepherds).

    http://www.gundogsupply.com/-l70-.html

    Wouldn't own a cat though lol
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    UnderWaterVanya's Avatar
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    Re: What is the shock level for 0 CYA water?

    Quote Originally Posted by George N
    Off the subject of CYA but I use this for watering the dogs (two German Shepherds).

    http://www.gundogsupply.com/-l70-.html

    Wouldn't own a cat though lol
    I tried a filtered recirculating water fountain for the cats... One of then splashed it out.

    I'm no cat fan either, but they make the family happy!

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    Inlaws Pool Boy since June 14th 2012, Pool built ~ 2003, In-Ground, 16'x32'
    13500 gal, Vinyl Liner, Fiberglass Slide, TF-100 Test Kit, Hayward 210T
    sand filter, A.O. Smith 1.5HP main pump motor (C48L2N134C1),
    Hayward SuperPump (model ?), Polaris 380 & PB4 Booster Pump

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