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Thread: Just learning

  1. Back To Top    #1

    Just learning

    Hello,
    I'm a new pool owner. We have an inground 16x32 pool with a hayward sand filter.
    I have been reading in pool school and purchased the Taylor test kit, 2006. All is going well, and my numbers are all looking good. But, my CYA level is 0. The previous owners left some trichlor, so I have that in a floating chlorinator, thinking that would incease the CYA while adding chlorine. I have been adding bleach, however to maintain my chlorine levels. I've been looking at the CYA chlorine chart, and I can't help but wonder if CYA is worth adding? If you need higher FC levels the higher your CYA, why add it at all? If yes, will using the trichlor increase my CYA fast enough, or should I add dry stabilizer?

    Thanks for any input!
    inground 16x32 vinyl
    20,000 gallon
    Hayward s200 sand filter
    Taylor K 2006 test kit
    New York State

  2. Back To Top    #2
    Butterfly's Avatar
    Join Date
    May 2007
    Location
    South Carolina
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    10,045

    Re: Just learning

    Welcome to TFP

    We suggest CYA levels between 30 and 50 for a bleach/liquid chlorine pool. If you plan on using trichlor tabs later, maybe during vacation, you could shoot for 30ish CYA and see how the FC holds. I suggest you add 30 PPM CYA via dry stabilize now using the sock method.

    You need CYA to protect the FC from sunlight. Without CYA, sunlight will eat FC and the FC is what keeps your pool sanitized an safe to swim in.

    Post a full set of test results for us and we will peruse them for you

    Nice job getting one of the recommended test kits
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    You're done SLAMing when:
    1)You lose 1ppm or less FC overnight, & 2)You have .5ppm CC's or less, & 3)your water is clear.

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  3. Back To Top    #3
    bridgman's Avatar
    Join Date
    Mar 2014
    Location
    Bowmanville, ON Canada
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    461

    Re: Just learning

    CYA levels are one of those tricky compromises. Higher CYA levels need higher FC levels (which is a real problem if you ever have to SLAM to kill an algae bloom), but the CYA also protects FC from being destroyed by sunlight so can reduce the amount of chlorine you need to add each day.

    The recommended levels from Pool School are 30-50 ppm CYA if you're adding bleach manually, 70-80ppm if you're using a salt water chlorine generator.

    If you're running very low CYA levels even a small amount of chlorine can be very harsh, so generally anything under 20 is not recommended.

    The normal recommendation here is to add CYA directly since it usually takes a few weeks to get your CYA level up with trichlor, but AFAIK either approach is OK.
    Cedar hot tub, 680 US gallons - Snorkel wood-burning heater, canoe paddle, "offline" Intex 1000 GPH pump/filter with skimmer

  4. Back To Top    #4

    Re: Just learning

    So, I've had 2 tabs of trichlor in floater for the past 3 weeks (replaced as they dissolved). Here were yesterday's numbers
    pH 7.6
    FC 4.4
    CC 0.2
    TA 150
    CYA less than 30, the water didn't cloud up at all, so I assume 0
    inground 16x32 vinyl
    20,000 gallon
    Hayward s200 sand filter
    Taylor K 2006 test kit
    New York State

  5. Back To Top    #5

    Join Date
    Mar 2014
    Location
    Las Vegas
    Posts
    288

    Re: Just learning

    In your pool each puck you add will add approximately 1.7 ppm CYA. (assuming 8 oz pucks) That's about 18 pucks to get to 30. I would add some CYA and get away from the pucks.
    12000 Gallon IG Plaster built 2/15/2014. Jandy 340 sg ft 127 gpm filter, Jandy 1 HP stealth pump. Circupool RJ-45 SWG (overkill). TF-100 with Speed Stir.

  6. Back To Top    #6

    Re: Just learning

    Thanks to all! This forum had helped me immensely!

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