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Thread: Closing pool - is slam necessary?

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    Closing pool - is slam necessary?

    Is it necessary to slam your pool before closing it, especially considering the pool was clean all year? I have no issue with doing so (besides having to purchase more bleach) but I'm wondering if it's truly necessary. Also this is the first time I've used Clorox for chlorinating the pool. I assume you SLAM with it as well?
    25,000 gal
    Sand filter
    IG
    Vinyl
    1 horsepower pump (don't know flow rate)
    14 years

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    duraleigh's Avatar
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    Re: Closing pool - is slam necessary?

    I don't think there is any suggestion of a SLAM to close but I do think there is a slight mix-up in terminology perhaps.

    A SLAM a process with an outline of actions to take and test to perform until it is complete. It is normally done when you CLEAR UP a pool....not close it.

    That said, it is a good idea to bring your FC to SLAM value before you close.....one last dose of high chlorine to give you protection over the winter. You can find your SLAM value only if you know your CYA and then refer to the FC/CYA relationship[ chart in Pool School.
    Dave S.
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    Texas Splash's Avatar
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    Re: Closing pool - is slam necessary?

    When you close, you're not really doing a full SLAM with all the SLAM requirements, you're only taking the FC up to the SLAM/Shock FC level once just prior to closing. That is simply to have additional FC pre-mixed with the water, along with colder temperatures, to last longer through the winter season. As for the bleach, any regular (generic) bleach will work. Just make sure it's non-scented, nothing fancy. Just regular plain bleach. Hope that helps.
    Pat (a.k.a. Texas Splash) ~ My Pool: Viking Fiberglass; 17,888 Gal; Waterway Supreme 2-sp/2-hp pump; Hayward Ctg filter; TF-100 w/ Speed Stir
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    Re: Closing pool - is slam necessary?

    Great guys! Thank you!

    - - - Updated - - -

    Also, when does everyone generally close their pool, meaning what week in October? I'm set this week to close but our thermometer recently broke and I haven't replaced it so I really don't know what the pool temp is. The temp outside has been hitting 50s just about every night the past week however. Is it too early in October to close? Is it best to wait another week at least?
    25,000 gal
    Sand filter
    IG
    Vinyl
    1 horsepower pump (don't know flow rate)
    14 years

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    Texas Splash's Avatar
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    Re: Closing pool - is slam necessary?

    Many people have already started to close, but really it's the temp that is key, not so much a specific time period. The water needs to be below 60 degrees to ensure algae won't try to grow in the water once you close and shut things down. Once you're sure that water temp is below 60, you can proceed with closing.
    Pat (a.k.a. Texas Splash) ~ My Pool: Viking Fiberglass; 17,888 Gal; Waterway Supreme 2-sp/2-hp pump; Hayward Ctg filter; TF-100 w/ Speed Stir
    Vital Links: POOL SCHOOL, RECOMMENDED LEVELS, RECOMMENDED CHEMICALS, Poolmath Calculator, SLAM, Chlorine/CYA CHART.
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    Re: Closing pool - is slam necessary?

    Quote Originally Posted by freddy2012 View Post
    Great guys! Thank you!

    - - - Updated - - -

    Also, when does everyone generally close their pool, meaning what week in October? I'm set this week to close but our thermometer recently broke and I haven't replaced it so I really don't know what the pool temp is. The temp outside has been hitting 50s just about every night the past week however. Is it too early in October to close? Is it best to wait another week at least?
    As Pat mentioned it is really about the water temp being below 60F. I'm in southern CT where the nights have been in the low 50/high 40's now, and my pool remains around 65F.

    I'm sure you can find a new thermometer at a decent price this late in the season. You will want one for next year anyway, no?

    Please add your location to your user info, it really helps with the advice you will receive.

    Dom
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    RNDEBBIEROSE's Avatar
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    Re: Closing pool - is slam necessary?

    I'm in upstate NY. Weather has been similar and my pool temp is 62, so I still will wait a bit.
    18 foot round AG vinyl 9,000 gallon pool, Hayward Perflex 1 hp pump, DE filter. Taylor K-2006 Test Kit. Pool new July, 2014.

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    Re: Closing pool - is slam necessary?

    That's the ticket! Remember to open early too!

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