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Thread: Trying to tweak numbers

  1. Back To Top    #1

    Trying to tweak numbers

    Hi all,

    I've been trying to 'zone in' with my test numbers. The obvious thing is that when I really hit the pool with the bleach it really cleans and clears it up. Now I know the trick is getting the CYA to buffer the bleach and that's where I seem to be falling down. I took it up to shock level over the weekend and did an overnight loss test and it seemed to hold OK. My test this a.m. showed virtually no FC so I added 80 oz. (5pt) of bleach and got

    FC 1.5
    CC .5
    T/A 110
    CYA ~38
    pH is low <7.2

    I added Borax ~ 3# to help the pH. What should I really focus on so that I can get to just adding daily small doses of bleach vs. having to hit it in 'shock' mode.

    Tx so much,

    JH
    Ct. Pooler
    16x32 IG ~ 23k gal
    Vinyl lined concrete sloping hopper deep end
    Hayward DE 36ft2
    Hayward BA heater not being used
    Gales Ferry Ct.

  2. Back To Top    #2

    Join Date
    Jan 2009
    Location
    Cupertino, CA
    Posts
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    Re: Trying to tweak numbers

    With CYA ~40, the Chlorine/CYA chart shows you want to target FC 5 (minimum 3) so your FC is still too low.

    80 oz of 6% bleach in 23k gallons is not quite 2ppm FC. That seems like a typical daily amount. You probably will find yourself using 1 small (96oz) or 1/2 big (182 oz) jug per day, more or less. If that seems like too much, you could try raising your CYA to 50 and you'd lose less per day (but must maintain higher levels).
    --paulr
    BBB "Intermediate Swimmer"
    IG plaster pool 18.5K gal, Hayward Pro-Grid DE filter, 3/4 HP Hydramax II; Polaris 380, 3/4 HP booster
    AG spa 325 gal, probably Sundance of some kind
    Water testing instructions on one page

  3. Back To Top    #3
    Mod Squad zea3's Avatar
    Join Date
    Jul 2009
    Location
    Houston, Texas
    Posts
    7,570

    Re: Trying to tweak numbers

    Try bringing the CYA up to about 50, especially if your pool gets a lot of direct sunlight. Do you test every evening? If you test every evening and plug the numbers into the pool calculator it should tell you how much you need for daily use. My pool has a high CYA (90- yes I know I need to drain & re-fill but we are in drought conditions so it will have to wait.) but it still only needs a few cups to maintain its recommended chlorine level if I test and add chlorine every night.
    TFP Moderator
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    Vogue 21' round AG, Pentair 1 hp 2 speed pump, 36 sq ft DE filter, Hayward S180T 150# sand filter, Houston, Texas
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  4. Back To Top    #4

    Re: Trying to tweak numbers

    Thanks Paul and Zea,

    Will give it a shot and see if I can stabilize it out. I'll report back my progress..

    JH
    Ct. Pooler
    16x32 IG ~ 23k gal
    Vinyl lined concrete sloping hopper deep end
    Hayward DE 36ft2
    Hayward BA heater not being used
    Gales Ferry Ct.

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