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Thread: CYA Level Still Low

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    CYA Level Still Low

    CYA level in our ~28k gallon pool at the start of the season was -0- (using a k2006 kit). Per the pool calculator, I added 9 lbs. of granular stabilizer to get the level to 40. We are going through a gallon of bleach a day, so I tested CYA and, though the test water is hazier than when I tested at the start of the season, I can still see the dot at the bottom of the tube at the -0- level. Should I add another pound or two and see what happens?

    Water is clear and combined chlorine is <1.

    Thanks for your thoughts.
    28k gallon in-ground vinyl. Sand filter. Hayward pump. Manual chlorination.

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    Butterfly's Avatar
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    Re: CYA Level Still Low

    Yes, you need to add some, but, what is the % cyanuric acid listed in ingredients on the jug you are using?
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    pwrstrk's Avatar
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    Re: CYA Level Still Low

    How long did you wait to take your test after adding the CYA ? It can take a week to fully register.


    Jeff
    24'x54" AG Morada RTR (by wilbar) 13'500 gal. Hayward Powerflo Matrix 1hp 2 speed. Hayward Perflex EC65 DE filter.

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    Re: CYA Level Still Low

    Thanks for your replies.

    I don't have the container anymore but it was HTH conditioner/stabilizer from Walmart. I think I've seen elsewhere that it is approx. 97%. I last added it to the pool about 3 weeks ago, so should be fully absorbed.

    I've already added 9 lbs. Think I should start by adding an additional 2 lbs.?

    Reading the CYA test is difficult!

    Thanks.
    28k gallon in-ground vinyl. Sand filter. Hayward pump. Manual chlorination.

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    pwrstrk's Avatar
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    Re: CYA Level Still Low

    Are you doing the test with the sun to your back ?


    Jeff
    24'x54" AG Morada RTR (by wilbar) 13'500 gal. Hayward Powerflo Matrix 1hp 2 speed. Hayward Perflex EC65 DE filter.

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    Re: CYA Level Still Low

    Should say that reading the test can be difficult for middle-aged eyes. Have to make sure I bring the reading glasses out to the pool. Yes, I rely on the sun to help me, or just a bright blue sky.
    28k gallon in-ground vinyl. Sand filter. Hayward pump. Manual chlorination.

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    pwrstrk's Avatar
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    Re: CYA Level Still Low

    I hear ya on the eyes. I use my reading glasses.


    Jeff
    24'x54" AG Morada RTR (by wilbar) 13'500 gal. Hayward Powerflo Matrix 1hp 2 speed. Hayward Perflex EC65 DE filter.

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    Re: CYA Level Still Low

    Did you backwash shortly after you added the stabilizer?
    Indiana, ABG 24'x52" Galveston by Blue Cascade (Craigslist buy w/part of deck included), 13,500 gallons, Intex SWG, solar panels mix 2, TF-100 test kit.

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    Re: CYA Level Still Low

    I put the stabilizer in a stocking in front of the return rather than in the skimmer, so am assuming backwash not an issue?
    28k gallon in-ground vinyl. Sand filter. Hayward pump. Manual chlorination.

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    Re: CYA Level Still Low

    You shouldn't back wash until the CYA has had a chance to fully dissolve, or it can be washed out when you back wash.
    Indiana, ABG 24'x52" Galveston by Blue Cascade (Craigslist buy w/part of deck included), 13,500 gallons, Intex SWG, solar panels mix 2, TF-100 test kit.

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  11. Back To Top    #11
    pwrstrk's Avatar
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    Re: CYA Level Still Low

    How about rain ? I had to raise mine up a little. We got any where from 9-12 inches of rain for June.


    Jeff
    24'x54" AG Morada RTR (by wilbar) 13'500 gal. Hayward Powerflo Matrix 1hp 2 speed. Hayward Perflex EC65 DE filter.

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    Re: CYA Level Still Low

    Will definitely hold off on backwashing after adding stabilizer, even if adding via stocking. Thanks for the tip.

    Yes, we had almost a foot of rain here too! I believe I added most of stabilizer after the rain.

    So if the test is registering a hazy -0-, should I just add a couple of pounds and see where that goes?
    28k gallon in-ground vinyl. Sand filter. Hayward pump. Manual chlorination.

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    pwrstrk's Avatar
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    Re: CYA Level Still Low

    Yea go ahead if your confident on your test levels.


    Jeff
    24'x54" AG Morada RTR (by wilbar) 13'500 gal. Hayward Powerflo Matrix 1hp 2 speed. Hayward Perflex EC65 DE filter.

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    pwrstrk's Avatar
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    Re: CYA Level Still Low

    Also remember the CYA will also lower your PH.


    Jeff
    24'x54" AG Morada RTR (by wilbar) 13'500 gal. Hayward Powerflo Matrix 1hp 2 speed. Hayward Perflex EC65 DE filter.

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    Re: CYA Level Still Low

    You can go ahead and do that and see where it gets you. You might have someone else there when you test again to see what they get as a result. Since it is a different test to get used to, it's not a bad idea to have another set of eyes sometimes.

    Also, are you sure you put in 9 lbs the first time? I don't think the Walmart here sells anything that large.
    Indiana, ABG 24'x52" Galveston by Blue Cascade (Craigslist buy w/part of deck included), 13,500 gallons, Intex SWG, solar panels mix 2, TF-100 test kit.

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  16. Back To Top    #16

    Re: CYA Level Still Low

    Thank you all for your comments.

    Jeff - I feel pretty confident about the test and I used new reagent. Just doesn't seem right that I add 9 lbs. and the test is showing close to -0-.

    Suziqzer - yes, I added two 4 lb. containers and part of a container from last year to get 9 lbs.

    That dot at the bottom of the tube will completely disappear, right?
    28k gallon in-ground vinyl. Sand filter. Hayward pump. Manual chlorination.

  17. Back To Top    #17

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    Re: CYA Level Still Low

    Yep, dot has to be completely, totally invisible.
    John
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