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Thread: how long does slamming take?

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    Join Date
    May 2014
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    NJ
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    how long does slamming take?

    I've brought my FC levels up to shock level but don't know how long does it normally take for FC levels to return to normal (approximate time frame) once overnight and CC test passed.
    I'm a new conversion to the TFP way because I've had enough of the pool store guy selling me everything under the sun. So far a doing much better with water chemistry. Also, why can't I add my pool & equipment description to my profile so I don't have to add it to every post. Any help would be appreciated.:



    7500 gallon in ground vinyl liner.
    Sand filter (oversized)
    gas heated (covered mostly, unless warm enough or being used)


    Chemistry numbers before slamming
    FC-7.4
    CC-0.5
    PH-7.4
    ALK-120
    CAL-260
    CYA-50

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    Smykowski's Avatar
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    Re: how long does slamming take?

    Welcome to the forum!

    To get to your signature, click on the Forum Actions tab at the top, then click edit profile. Edit signature is on the left side, about halfway down.

    Just to confirm, you've held your FC at SLAM level continuously until all three criteria are passed? After the SLAM is complete, the speed at which the FC falls depends on bather load, air and water temp, and sunlight on the pool. Sorry, but there's really no good universal answer. Plan on a couple days.
    33' round, 23,000 gal AG vinyl , 1HP 2spd PowerFlo Matrix downsized with 3/4HP impeller (X2), Hayward S180T 150# sand filter (X2), Hayward H250 NG heater Pool Store year 1 - $850 for 2 months; Pool Store year 2 - $440 for 2 months, TFPC year 1 - $170 for 4 months; TFPC year 2 - $95 for 4.5 months
    The most important article on this site - The ABCs of Pool Water Chemistry

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    Richard320's Avatar
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    San Dimas, CA (LA County)
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    Re: how long does slamming take?

    Assuming you SLAM at 20 since your CYA is 50, FC will probably be down to normal in two days. Maybe sooner, if a bunch of people pile in. And yes, it's safe to swim all the way to SLAM levels. If it's 20 at bedtime, and 19 or better before sunrise, it'll probably be down to 15 by afternoon when its warm enough to swim.

    Take the three tests in order.
    1) The water is clear. Nothing on the walls or floor.
    2) CC is .5 or less
    3) Loses less than 1 FC overnight.

    If all three haven't passed, you haven't passed. Keep SLAMming!
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
    Troublefree does not mean Maintenancefree. It's like brushing your teeth: You can spend a couple minutes a day and pennies a week or go to the dentist once a year and spend several thousand dollars.
    A pool is like a pet - you have to feed it every day, even the days you don't want to play with it!

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    Re: how long does slamming take?

    Thanks for the reply and info.

    It may take me a little to learn how to navigate the site but I'll get there.
    Yes all three passed. The clarity wasn't an issue any way but the CC & FC both passed this morning. I just began to see small areas which I thought were algae ( but could have been pollen but I don't think so) and the CC at .5 so I brought the FC to 15ppm. It held over night and the CC is 0-.2.
    Tredd23-Central NJ
    In-Ground-20x12 Vinyl liner (7600gal)/1.5hp Super pump/300# Sand filter (oversized I know)/In-line chlorinator (I use 3' pucks)only to maintain CYA/150K BTU Hayward gas heater/Water temp maintained at 85/Clear 16mil solar blanket/Taylor 2006 test kit
    Vita Joli spa 250gal/cartridge filters w/ozonator

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    Re: how long does slamming take?

    Also, when the water balance is correct, does keeping the solar blanket on to much affect the FC levels? Is there a general rule for how much the cover can stay on? I realize that heat loss is mostly at night but with the cooler than usual spring we've had I have been leaving it on more than I usually do (heating cost concern). Does the sun light penetrate the clear blanket at affect FC levels? Should I switch to a blue color blanket to stop the sun from breaking down the FC?
    Any thoughts?
    Tredd23-Central NJ
    In-Ground-20x12 Vinyl liner (7600gal)/1.5hp Super pump/300# Sand filter (oversized I know)/In-line chlorinator (I use 3' pucks)only to maintain CYA/150K BTU Hayward gas heater/Water temp maintained at 85/Clear 16mil solar blanket/Taylor 2006 test kit
    Vita Joli spa 250gal/cartridge filters w/ozonator

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    Mod Squad JohnT's Avatar
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    Re: how long does slamming take?

    Quote Originally Posted by Tredd23 View Post
    Also, when the water balance is correct, does keeping the solar blanket on to much affect the FC levels? Is there a general rule for how much the cover can stay on? I realize that heat loss is mostly at night but with the cooler than usual spring we've had I have been leaving it on more than I usually do (heating cost concern). Does the sun light penetrate the clear blanket at affect FC levels? Should I switch to a blue color blanket to stop the sun from breaking down the FC?
    Any thoughts?
    I think the effect of the cover on chemistry in a pool that has no issues is minimal. The biggest effect is the fact that the skimmer doesn't work with the cover on, so if you have a lot of dust and debris falling on the cover you may need to clean the pool more. If I have my cover on and we aren't swimming regularly, I usually roll the cover up a couple of times a week for at least a few hours.
    TFP Moderator
    20K Gallon 20X36 Vinyl Inground
    Hayward S244T Sand Filter with 1HP Whisperflo Pump. Liquidator C-201 and Solar Heat

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    duraleigh's Avatar
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    Re: how long does slamming take?

    Remove the cover every couple of days for a few hours. Allow the pool to breath a little. There is no general rule.

    Don't overthink the blue vs clear blanket. It really doesn't matter much in the big scheme of things.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

  8. Back To Top    #8

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    Re: how long does slamming take?

    I rolled up the cover shortly after posting that the slamming test past but come to find that I can see light green stains in the same spots prior to slamming (all stains in hopper area). it brushes away easily but I'm really confused about if its algae or maybe just pollen. I brushed the entire pool last night before covering.
    Thoughts?............ Driving me crazy.

    I'd hate to keep slamming if its not algae. Is there anyway to tell?
    Tredd23-Central NJ
    In-Ground-20x12 Vinyl liner (7600gal)/1.5hp Super pump/300# Sand filter (oversized I know)/In-line chlorinator (I use 3' pucks)only to maintain CYA/150K BTU Hayward gas heater/Water temp maintained at 85/Clear 16mil solar blanket/Taylor 2006 test kit
    Vita Joli spa 250gal/cartridge filters w/ozonator

  9. Back To Top    #9

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    Re: how long does slamming take?

    This morning the FC dropped 1ppm or less overnight and the CC remained at .0 to .2. That makes three night in a row. The water is still crystal clear and no signs of any greenish stains.
    Thanks for the help and advice.
    Tredd23-Central NJ
    In-Ground-20x12 Vinyl liner (7600gal)/1.5hp Super pump/300# Sand filter (oversized I know)/In-line chlorinator (I use 3' pucks)only to maintain CYA/150K BTU Hayward gas heater/Water temp maintained at 85/Clear 16mil solar blanket/Taylor 2006 test kit
    Vita Joli spa 250gal/cartridge filters w/ozonator

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