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Thread: Sunlight and Chlorine levels

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    tlcottone's Avatar
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    Sunlight and Chlorine levels

    Ok is there any chart on the effect of sunlight on chlorine. I have an above ground Intex 18x48 about 7500 gallons. My CYA is 40. How quickly at this level does sunlight burn off the bleach added?
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    Mod Squad jblizzle's Avatar
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    Re: Sunlight and Chlorine levels

    I am not sure there is a chart anywhere, but I would guess around ~40% would be lost in a day in the summer. Really depends on sun exposure.

    It is pretty normal to lose 2-3ppm of FC each day which is why it must be added daily.
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    tlcottone's Avatar
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    Re: Sunlight and Chlorine levels

    Thanks for the info. Pool is cloudy and am shocking it right now. Was just wondering how much would be lost due to sunlight. Its been sunny daily here with temps in the mid 80's.
    6423 AG Intex 18 x 48 Intex 2100 GPH Sand Filter Pool Pump TF100 test kit

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    Mod Squad jblizzle's Avatar
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    Re: Sunlight and Chlorine levels

    Well, at the higher SLAM FC levels, you will still lose the same %, but it will be more ppm than the normal 2-3ppm.
    With a SLAM level of 16ppm, I would expect you to lose 6-8ppm just to the sun, not counting what is lost to organics in the pool.
    Jason, TFP Moderator
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    tlcottone's Avatar
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    Re: Sunlight and Chlorine levels

    Thanks again. Been slamming for a week and while it is still cloudy the bottom is now visible. So it's almost there.
    6423 AG Intex 18 x 48 Intex 2100 GPH Sand Filter Pool Pump TF100 test kit

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    JasonLion's Avatar
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    Re: Sunlight and Chlorine levels

    If the water is in the 80s, you would lose roughly 60% of your starting FC level over the course of a sunny day. Presumably the water is colder than that, so less. That is a rough approximation. The actual percentage varies a great deal depending on several different factors, so it is difficult to make a chart.
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    tlcottone's Avatar
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    Re: Sunlight and Chlorine levels

    Water temp is in the 60's right now. But with this early warm weather. the water has been getting warmer.
    6423 AG Intex 18 x 48 Intex 2100 GPH Sand Filter Pool Pump TF100 test kit

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