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Thread: Slam during hot weather

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    Slam during hot weather

    We are doing our first ever slam on our new AG pool. We had lots of pool use in the hot weather and the fc went down to zero. I noticed the water looked really dull too. So...I am on day eight and was surprised that the OCLT went down from 18.5 to 15.5 last night. The water looks beautiful, it's sparkling away and the dull appearance has disappeared. The CYA was at 40 when I started so I've been working to keep the FC at 16. The first few days I didn't realized I needed to really attack and keep he FC levels up constantly, but I've caught on and now I'm checking levels every hour or two. We're having upper 90's to 100 degrees all week so it's taking a lot of chlorine, I'm using Walmarts chlorinating liquid 10%. So everything looks right to me except the OCLT numbers aren't staying up. Any thoughts? Yesterday the OCLT went down 1.5.
    AG Doughboy 16x28', Opened June 2016
    Aquaview 20" filter w 7 position valve
    1-1/2 hp Powerline Pump
    TF-100 Test Kit

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    Pool Tool's Avatar
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    Re: Slam during hot weather

    Thoughts - Stairs; if you have them its time to take them out and give them a scrub. Anything else in the water should be pulled out and scrubbed down too. Pool toys can be thrown in the for the high FC to treat. You can also use a cover during the day to protect the FC from the sun if you have one.
    16' x 32' (21100 gal), vinyl, 1.5 hp Hayward SuperPump,
    Tagelus TA60/60D Sand Filter, Raypak 399K Digital Heater, TF-100

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    cj3737's Avatar
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    Re: Slam during hot weather

    Little bit of backtracking but it seems like you get it..


    OCLT fail due to algae... no worries.. just keep slamming until you pass
    Inherited 24' Muskin Above ground
    13500 gal
    Hayward S180T92S Sand filter
    Taylor K-2006C Speedstir
    TFPC for Beginners | Pool Math | Pool School | CYA Chart | SLAM | Test Kits | ABC's

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    Re: Slam during hot weather

    We do have stairs. I'll scrub them down today. I pulled them out the first day and just vacuumed under them.

    - - - Updated - - -

    Thank you, just need to know I'm on the right track.
    AG Doughboy 16x28', Opened June 2016
    Aquaview 20" filter w 7 position valve
    1-1/2 hp Powerline Pump
    TF-100 Test Kit

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    Re: Slam during hot weather

    You are absolutely on the right track and very close to the end. You are looking for an FC loss of 1.0 or less overnight and you came very close, losing only 1.5. You will probably be there the next time you test.

    I might add that you did a great job recognizing the need to keep the FC up. Many, many of our newbies never understand that and "SLAM" for weeks when they are really not SLAMing.

    You caught on to that and your SLAM will be very successful.....ridding your pool of ALL organic contaminants and giving you sparkling water.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Re: Slam during hot weather

    You're on the right track. Empty the skimmer & filter baskets when starting the OCLT. What type of filter do you have & when was it cleaned last?
    16' x 34' vinyl in ground - 16,500 gal.
    Hayward EC-75 DE filter with Hayward 1hp Super Pump
    TF-100XL Test Kit with SpeedStir

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    Re: Slam during hot weather

    Thank you, I did waste about the first five days of what I thought was slamming, but I know the will be a learning year. I think though, there could be a support group thread for anyone doing a slam. Haha.
    AG Doughboy 16x28', Opened June 2016
    Aquaview 20" filter w 7 position valve
    1-1/2 hp Powerline Pump
    TF-100 Test Kit

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    Re: Slam during hot weather

    I have a sand filter and I've been back washing almost daily. It's a brand new pool and filter, just opened six weeks ago, and there never was any visible algae yet. So it's feels so close but hopefully good news tomorrow after an OCLT.
    AG Doughboy 16x28', Opened June 2016
    Aquaview 20" filter w 7 position valve
    1-1/2 hp Powerline Pump
    TF-100 Test Kit

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    Re: Slam during hot weather

    There's no need to back wash daily. Sand filters actually work better when they're dirty. You just want to back wash when you get a 10 - 20% rise over the clean pressure.
    16' x 34' vinyl in ground - 16,500 gal.
    Hayward EC-75 DE filter with Hayward 1hp Super Pump
    TF-100XL Test Kit with SpeedStir

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    northrn's Avatar
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    Re: Slam during hot weather

    and brush every day...floors, walls, around the skimmer and return. good luck!
    27' AG 18K Gallons ~ Cartridge Filter ~ Pentair 1.5 HP Pump

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    Re: Slam during hot weather

    Ok, so I'm puzzled. The pool is still sparkling, but at night after the sun goes down, the FC bums way up even though IM adding the right amount of bleach. My SLAM target is 16. Last night it jumped to 28 after the sun went down but still dropped to 25 this morning, UGH. I've been faithfully vacuuming, a brushing. Yesterday I took the stairs out and wrestled with them and scrubbed but they weren't visibly dirty and didn't feel any slime, the entire pool setup is only six weeks old.
    Pone thing I'm wondering about today is the weights I'm using for the steps. I used bleach bottles, filled them with pea rock. I rinsed them out to get the dirt out and then filled the rest with a little bleach and hen full with water. BUT, the last two I filled, I forgot the bleach part, I just put these in during the shock, a few days ago. Could they be leaking something out that is still causing problems?

    Again, there never was any visible algae before the slam, I just pooped out after having company and got behind on testing a couple days, and the fc dropped to 0.
    AG Doughboy 16x28', Opened June 2016
    Aquaview 20" filter w 7 position valve
    1-1/2 hp Powerline Pump
    TF-100 Test Kit

  12. Back To Top    #12

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    Re: Slam during hot weather

    Will do, thank you!
    AG Doughboy 16x28', Opened June 2016
    Aquaview 20" filter w 7 position valve
    1-1/2 hp Powerline Pump
    TF-100 Test Kit

  13. Back To Top    #13

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    Re: Slam during hot weather

    Is it normal for the evening CL test to be elevated above the target during a SLAM? Mine was 28 last night, target is 16. This morning it was 25. It's done that four nights in a row.
    AG Doughboy 16x28', Opened June 2016
    Aquaview 20" filter w 7 position valve
    1-1/2 hp Powerline Pump
    TF-100 Test Kit

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    Pool Tool's Avatar
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    Re: Slam during hot weather

    I'm confused, only adding chlorine will raise your chlorine. Unless you're adding at night to get to 28 something is amiss. FC tests are not affected by sunlight or other factors.

    16' x 32' (21100 gal), vinyl, 1.5 hp Hayward SuperPump,
    Tagelus TA60/60D Sand Filter, Raypak 399K Digital Heater, TF-100

  15. Back To Top    #15

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    Re: Slam during hot weather

    I did an FC test at supper time, 6-7 pm. I added enough chlorine wanting to get it up to my SLAM goal of 16. Two hours later I test again and it's 28. The next morning it's 25 just before sunrise.

    Now I am out of regent, it will be here thurs or Friday. Shoot. Luckily I have the numbers from today so I'll add chlorine like I did today and try to stay on track.
    AG Doughboy 16x28', Opened June 2016
    Aquaview 20" filter w 7 position valve
    1-1/2 hp Powerline Pump
    TF-100 Test Kit

  16. Back To Top    #16
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    Re: Slam during hot weather

    So it's one two things, either your testing is not consistent or your volume estimate of your pool is off. How many gallons are in your pool, are you confident with this? Are you using PoolMath to estimate how much chlorine you are adding? Again, the only way your reaching 28 instead of 16 is that your tests are inconsistent or your pool volume and therefore addition calculations are wrong.

    Please:
    - post test results at 6-7 pm last night (7/19).
    - post volume of chlorine added after test @ 6-7 last night
    - confirm test results at 8-9 pm last night (7/19); FC = 28
    - confirm test results following morning (7/20); FC = 25
    - confirm CYA value of 40 ppm

    Thanks.
    16' x 32' (21100 gal), vinyl, 1.5 hp Hayward SuperPump,
    Tagelus TA60/60D Sand Filter, Raypak 399K Digital Heater, TF-100

  17. Back To Top    #17

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    Re: Slam during hot weather

    I've stopped writing data down since his SLAM has taken so much time, and I ran out of regent on 7/20. The refills arrived today so I'm back on track. I'll post tonight. Do I test for CYA and PH during the slam? I tested for cc today and it was .5.
    Ill wrap up the evening and post later. The temps have also been upper 90's to 102 this week, so the pool has been gobbling up a lot of chlorine.
    AG Doughboy 16x28', Opened June 2016
    Aquaview 20" filter w 7 position valve
    1-1/2 hp Powerline Pump
    TF-100 Test Kit

  18. Back To Top    #18
    Pool Tool's Avatar
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    Re: Slam during hot weather

    Don't bother with pH test, results are inaccurate with FC levels over 10. All other tests should be fine.

    16' x 32' (21100 gal), vinyl, 1.5 hp Hayward SuperPump,
    Tagelus TA60/60D Sand Filter, Raypak 399K Digital Heater, TF-100

  19. Back To Top    #19

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    Re: Slam during hot weather

    Cya at 25 during SLAM. When I started the Slam almost two weeks ago, cya was 40. It is now 25. Pool math says I should add 24 oz of stabilizer. So should I just put it in a sock and wait for it to dissolve? Or when should I start to add chlorine again? I've been adding 1/2 to 1 gallon of chlorine every hour four four days. I attributed it to the 99 degree heat and full sun on the pool. The pool is still sparkling away.
    AG Doughboy 16x28', Opened June 2016
    Aquaview 20" filter w 7 position valve
    1-1/2 hp Powerline Pump
    TF-100 Test Kit

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