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Thread: Losing CYA

  1. Back To Top    #1

    Join Date
    Aug 2012
    Location
    Fort Worth, TX
    Posts
    83

    Losing CYA

    FC- 6.0
    CC- 0
    pH - 7.2
    TA - 80
    CH - 850
    CYA - 30

    I know for a fact I'm losing CYA. It was 50 ppm two months ago and it's 30 now.
    There is no leakage. No splashing to amount to anything. Only my wife and I use the pool and we're too old to cause any splashing.
    The only water loss is when I clean my cartridge filters.
    When I started BBB I had 0 CYA. That was September of 2013.
    Since then I have added 7 lb of HTH Stabalizer and conditioner (granule).
    I ran my pool through the Winter.
    10,000 gal / Plaster / Cartridge Filter / 1 1/2 HP pump motor/ TF-100 test kit.

  2. Back To Top    #2

    Join Date
    May 2014
    Location
    Houston, TX
    Posts
    155

    Re: Losing CYA

    I have the same problem, which I posted a thread about.

    Do you have auto-fill? Or do you have to keep refilling your pool after significant evaporation loss (I see you live in TX, it's been hot lately). You've also had a lot of rain in the past 2 months?

    In my case, I've had a lot of splash out, refilling once a week and letting it overflow a bit each time, and we've also had a lot of rain in June through mid July. Plus, the heat and sun warms the water to cause 2-4 ppm loss per month.

    Each one of these factors, in isolation, may cause very small CYA losses, not enough to matter. However, a combination of all these factors, happening simultaneously, may cause significant CYA losses. That's my best guess.
    IG gunite pool size: 12,500 gallons - includes spa with spillover, Polaris vacuum cleaner, Ultrapure Ozonator, inline tab chlorinator that I no longer use
    Filter: Hayward Swimclear Model #4030, 4-Cartridge Filters
    Pump: Century, 2 HP with a Hayward 6060 booster pump
    Date of build: March-April 2014 *NEW* : Test kit: TF-100

  3. Back To Top    #3

    Join Date
    Aug 2012
    Location
    Fort Worth, TX
    Posts
    83

    Re: Losing CYA

    I manually refill the pool. Under this Sun I add about 1/4"- 1/2" a day.
    I've done a bucket test and am satisfied I don't have a leak.
    I didn't know that warm water caused 2-4 ppm CYA loss per month.
    I guess I'll go add another 2 lbs.
    Thanks for the reply

    Any rain we've had has long since evaporated out of the pool. I never had enough rain that I had to drain any of it out.
    10,000 gal / Plaster / Cartridge Filter / 1 1/2 HP pump motor/ TF-100 test kit.

  4. Back To Top    #4

    Join Date
    May 2014
    Location
    Houston, TX
    Posts
    155

    Re: Losing CYA

    So you're adding 1/4 to 1/2 a day, for 60 days that's about 15 to 30 inches of refilled water. You might have an overflow drain (like I do) so this amount of refilling might have been diluting your CYA.
    IG gunite pool size: 12,500 gallons - includes spa with spillover, Polaris vacuum cleaner, Ultrapure Ozonator, inline tab chlorinator that I no longer use
    Filter: Hayward Swimclear Model #4030, 4-Cartridge Filters
    Pump: Century, 2 HP with a Hayward 6060 booster pump
    Date of build: March-April 2014 *NEW* : Test kit: TF-100

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