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Thread: how much CYA for pool with pool cover

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    how much CYA for pool with pool cover

    solid gray automatic pool cover

    mostly shaded when open

    what cya should I aim for?
    32x15 IG Borate+Salt, Pentair VS+SVRS, howard swim pure 40 SWG, Pentair 4000 48sqft DE, Mastertemp 300, Electric Pool Cover, Polaris P93, 4 Kids for Aeration, ;)

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    Mod Squad jblizzle's Avatar
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    Re: how much CYA for pool with pool cover

    30ppm
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    Re: how much CYA for pool with pool cover

    Hi Cloudbusting! How long have you been maintain your pool? You don't have a SWG do you. Have you been having issues with getting chlorine levels to fall?

    I second the recommendation to keep CYA low with your cover. I had mine at the recommended 70 all last year, and it was a real bear to get chlorine levels to drop when they creeped up during my dialing in the SWG phase. I'm leaving mine at 50 this year to see if it is more manageable, but it is proving to be just as difficult.

    I'm actually entertaining the idea of having some Chlorine reducer on hand which is Sodium Thiosulfate .
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    Re: how much CYA for pool with pool cover

    Just dumped 200pounds of salt into the pool today and getting ready to add ic-40 swg - still recommended to keep cya at 30? Swg school article mentioned 50-70
    32x15 IG Borate+Salt, Pentair VS+SVRS, howard swim pure 40 SWG, Pentair 4000 48sqft DE, Mastertemp 300, Electric Pool Cover, Polaris P93, 4 Kids for Aeration, ;)

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    Mod Squad jblizzle's Avatar
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    Re: how much CYA for pool with pool cover

    With a SWG, you likely want to be in the 50-70ppm range. This is slightly lower due to the cover and shade.
    Jason, TFP Moderator
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    Re: how much CYA for pool with pool cover

    Why 70ppm with swg+covered vs. 30ppm for covered pool and conventional chlorine?

    I thought cya protects clorine from sunlight or does it help the swg also?
    32x15 IG Borate+Salt, Pentair VS+SVRS, howard swim pure 40 SWG, Pentair 4000 48sqft DE, Mastertemp 300, Electric Pool Cover, Polaris P93, 4 Kids for Aeration, ;)

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    harleysilo's Avatar
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    Re: how much CYA for pool with pool cover

    Quote Originally Posted by Cloudbusting
    Why 70ppm with swg+covered vs. 30ppm for covered pool and conventional chlorine?

    I thought cya protects clorine from sunlight or does it help the swg also?
    I don't know the answer, but suspect the answer is not clear because having and using an opaque cover is not what the majority are doing. Therfore there is not a lot of data on exactly how high it needs to be.... It's much easier to raise CYA if you have problems keeping chlorine in your pool. If I were you I'd start at 30 ppm and see how it goes.
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    Re: how much CYA for pool with pool cover

    should-i-increase-my-cya-levels-t251.html

    Looks it was discussed before... Cya appears to help the cell

    I think I'll aim for 40 initially and see how it goes

    Cover is "solid" gray/no light goes thru it
    32x15 IG Borate+Salt, Pentair VS+SVRS, howard swim pure 40 SWG, Pentair 4000 48sqft DE, Mastertemp 300, Electric Pool Cover, Polaris P93, 4 Kids for Aeration, ;)

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    Mod Squad jblizzle's Avatar
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    Re: how much CYA for pool with pool cover

    You can try the CYA at 30ppm. SWG are slow to add FC, thus the need for added protection from the sun. See what the required setting on the SWG to maintain your FC, if the setting is high, you may find that increasing the CYA will actually lower how hard the SWG has to work ... theoretically this should actually make the SWG cell last longer as well.
    Jason, TFP Moderator
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    harleysilo's Avatar
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    Re: how much CYA for pool with pool cover

    If the pool is mostly shaded when opened, but also closed the majority of the time, how many hours of sunlight per week are we talking about? 4? 8? Seems like your really talking about inside pool conditions. I get full sun on my open pool about 13-15 hours per week, and at 50 ppm CYA if I overshoot FC with my SWG it can take weeks to come down. Just sayin'.
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    Re: how much CYA for pool with pool cover

    About 8h/week of sun

    Swg is starting to feel comfortable at around 40cya
    32x15 IG Borate+Salt, Pentair VS+SVRS, howard swim pure 40 SWG, Pentair 4000 48sqft DE, Mastertemp 300, Electric Pool Cover, Polaris P93, 4 Kids for Aeration, ;)

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