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Thread: closed pool 52F - won't hold chlorine, should I SLAM it?

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    closed pool 52F - won't hold chlorine, should I SLAM it?

    My pool is still closed for the winter with a mesh cover. I went to pump some water out and noticed some green growing on the steps. No FC... Water is 52F.
    I started to SLAM, but wanted to make sure there isn't something I'm missing. The quick chlorine test should work at 52F correct?
    In ground irregular shape Vinyl pool 20,000 gallons, Hayward S244T Pro Series High-Rate Sand Filter, Waterway 1hp SVL56 pump, 24hr timer set for 8 hrs/day runtime typically, Diving Board, 12' deep end 3.5' shallow end, solar cover, 250,000 Btu Natural Gas Bryandt heater, Using Liquid Bleach for chlorine, built in 2000. TF-100

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    Mod Squad woodyp's Avatar
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    Re: closed pool 52F - won't hold chlorine, should I SLAM it?

    I'd let that test water warm to room temp................BUT.....................you got green so there's your answer.
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    Re: closed pool 52F - won't hold chlorine, should I SLAM it?

    I think the bleach I got is old.. I added 12 gallons and have no FC 10 minutes after I added it. The green was only a little growing in the steps. The water was and is clear....
    In ground irregular shape Vinyl pool 20,000 gallons, Hayward S244T Pro Series High-Rate Sand Filter, Waterway 1hp SVL56 pump, 24hr timer set for 8 hrs/day runtime typically, Diving Board, 12' deep end 3.5' shallow end, solar cover, 250,000 Btu Natural Gas Bryandt heater, Using Liquid Bleach for chlorine, built in 2000. TF-100

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    Re: closed pool 52F - won't hold chlorine, should I SLAM it?

    Uh oh. What was your CC level? What about your CYA level?
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    Re: closed pool 52F - won't hold chlorine, should I SLAM it?

    Ahh, back to the basics. Thanks for the reminder.
    when I winterized the pool everything was perfect.
    Now?
    FC: 0
    CC: 0
    pH 7.5
    TA: 20
    CA: 20
    CYA: 0

    So, I'm going to get the pump running, bring up the TA, then use some triclor pucks to bring the CYA up and pH down (assuming the Alki plus will raise the pH in the process)

    Does that sound like a good plan?

    Thanks!
    In ground irregular shape Vinyl pool 20,000 gallons, Hayward S244T Pro Series High-Rate Sand Filter, Waterway 1hp SVL56 pump, 24hr timer set for 8 hrs/day runtime typically, Diving Board, 12' deep end 3.5' shallow end, solar cover, 250,000 Btu Natural Gas Bryandt heater, Using Liquid Bleach for chlorine, built in 2000. TF-100

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    Mod Squad pooldv's Avatar
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    Re: closed pool 52F - won't hold chlorine, should I SLAM it?

    Yep, good plan.

    You can use baking soda to raise TA.
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    Re: closed pool 52F - won't hold chlorine, should I SLAM it?

    Quote Originally Posted by JimTMich View Post
    Ahh, back to the basics. Thanks for the reminder.
    when I winterized the pool everything was perfect.
    Now?
    FC: 0
    CC: 0
    pH 7.5
    TA: 20
    CA: 20
    CYA: 0

    So, I'm going to get the pump running, bring up the TA, then use some triclor pucks to bring the CYA up and pH down (assuming the Alki plus will raise the pH in the process)

    Does that sound like a good plan?

    Thanks!
    Don't add that CYA just yet.

    What was your CYA at closing?

    There have been rare instances that when opening a pool and finding both the FC and CYA at zero, the CYA may have been converted by bacteria to ammonia. Adding CYA will fuel the bacteria to make more ammonia.

    Have a read here:
    https://www.troublefreepool.com/thre...g-with-Ammonia
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    Re: closed pool 52F - won't hold chlorine, should I SLAM it?

    CYA was 50 when I closed, but about half the water has been removed and replaced with rain/snow water over the winter, so I was expecting about 30 CYA.

    Interesting CYA eating bacteria.
    In ground irregular shape Vinyl pool 20,000 gallons, Hayward S244T Pro Series High-Rate Sand Filter, Waterway 1hp SVL56 pump, 24hr timer set for 8 hrs/day runtime typically, Diving Board, 12' deep end 3.5' shallow end, solar cover, 250,000 Btu Natural Gas Bryandt heater, Using Liquid Bleach for chlorine, built in 2000. TF-100

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    Re: closed pool 52F - won't hold chlorine, should I SLAM it?

    Well I ran the pump for a few hours, added 8lbs alki plus to get started last night.
    This evening I have:
    FC: 23
    pH: 7.8
    TA: 80
    CA: 70
    CYA: 30

    What just happened?
    In ground irregular shape Vinyl pool 20,000 gallons, Hayward S244T Pro Series High-Rate Sand Filter, Waterway 1hp SVL56 pump, 24hr timer set for 8 hrs/day runtime typically, Diving Board, 12' deep end 3.5' shallow end, solar cover, 250,000 Btu Natural Gas Bryandt heater, Using Liquid Bleach for chlorine, built in 2000. TF-100

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