Become a TFP Supporter Pool Math Forum Rules Pool School
Results 1 to 17 of 17

Thread: SLAM Question

  1. Back To Top    #1
    Task's Avatar
    Join Date
    Sep 2013
    Location
    West Grove, PA
    Posts
    232

    SLAM Question

    Just opened my pool. Its a brand new pool and was just built in this past fall so this will be my first year with it. My pool builder was finishing some work over the past week or so and I've also been finishing a lot of the landscaping for the past few weeks.
    I ran the tests last week to see how my water was, and PH was high and I had no FC. I also have no CYA. So I added a gallon of bleach and brought my FC up to 5, and added some muriatic acid to bring my PH down to 7.5. I didn't however have any stabilizer on hand. I checked the pool store but thought their prices were a little high, and couldn't find any CYA at my local Walmart so I ordered an 8lb bucket online, which I received today.
    My water is getting a green tint to it so I want to start SLAMMING it this weekend. If I SLAM the pool with no CYA, will the sun wipe out my chlorine or should I wait a week for the CYA to disolve before I SLAM? Or should I hang the CYA in a sock and let it float around while I'm SLAMMING the pool?
    16'x32' Inground Vinyl, 21,100 gallons, Hayward 1.5 HP Super Pump, Hayward Pro Series S244T 3.1ft Sand Filter
    TFTestKits, Pool School, ABC's of Pool Water Chemistry, Chlorine/CYA Chart, PoolMath

  2. Back To Top    #2
    Richard320's Avatar
    Join Date
    Jan 2010
    Location
    San Dimas, CA (LA County)
    Posts
    18,768

    Re: SLAM Question

    Hang the CYA in a sock and use the calculated value as your CYA level for establishing the SLAM level. I would target something like 30 for now. Then start the bleach. You can do them simultaneously.
    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!

  3. Back To Top    #3
    Task's Avatar
    Join Date
    Sep 2013
    Location
    West Grove, PA
    Posts
    232

    Re: SLAM Question

    Ok will do. Thanks Richard
    16'x32' Inground Vinyl, 21,100 gallons, Hayward 1.5 HP Super Pump, Hayward Pro Series S244T 3.1ft Sand Filter
    TFTestKits, Pool School, ABC's of Pool Water Chemistry, Chlorine/CYA Chart, PoolMath

  4. Back To Top    #4
    Casey's Avatar
    Join Date
    Apr 2007
    Location
    SW PA
    Posts
    10,157

    Re: SLAM Question

    You certainly don't have to wait until the CYA dissolves. Just calculate how much CYA you've added as Richard noted and SLAM away.
    I'd bet you my bikini you'll never get TFP water from a pool store!

    24' Sharkline Venture De Filter

  5. Back To Top    #5
    Task's Avatar
    Join Date
    Sep 2013
    Location
    West Grove, PA
    Posts
    232

    Re: SLAM Question

    looks like I've got my weekend planned! case of beer, couple cases of bleach and my pool.
    16'x32' Inground Vinyl, 21,100 gallons, Hayward 1.5 HP Super Pump, Hayward Pro Series S244T 3.1ft Sand Filter
    TFTestKits, Pool School, ABC's of Pool Water Chemistry, Chlorine/CYA Chart, PoolMath

  6. Back To Top    #6
    Casey's Avatar
    Join Date
    Apr 2007
    Location
    SW PA
    Posts
    10,157

    Re: SLAM Question

    Sounds like a plan! I get to work and go to the Dr tomorrow.
    I'd bet you my bikini you'll never get TFP water from a pool store!

    24' Sharkline Venture De Filter

  7. Back To Top    #7
    Task's Avatar
    Join Date
    Sep 2013
    Location
    West Grove, PA
    Posts
    232

    Re: SLAM Question

    Well, I've been at work since 2pm and i'll be here until 6am, so I can't say I really feel bad for you. My plan is to get home around 7am, run all my tests, get that CYA hanging in the pool, bring it up to shock level and then take a nice nap. And then monitor everything all weekend. The water isn't too bad so I'm hoping I won't need to maintain shock level for more then a few days, but I have no experience doing this so who am I to guess. Right now, I can see the bottom of the 3' side of the pool. I can also see the silhouette of the drain cover in the 8' side of the pool, but the water is to dark, with a slightly green tint, to see the liner. I'm starting off with 8 gallons of 8.25% bleach. Any guess as to how much I might go through so I can pick up some more in advance?
    16'x32' Inground Vinyl, 21,100 gallons, Hayward 1.5 HP Super Pump, Hayward Pro Series S244T 3.1ft Sand Filter
    TFTestKits, Pool School, ABC's of Pool Water Chemistry, Chlorine/CYA Chart, PoolMath

  8. Back To Top    #8
    Casey's Avatar
    Join Date
    Apr 2007
    Location
    SW PA
    Posts
    10,157

    Re: SLAM Question

    Well some in the Baq forum would say... If you think you have enough bleach, double it! As long as you keep it in a cool dark place, it should keep well.

    I'll be getting off at 7am too. Work 12's 3 days a week and get 4 day weekends.
    I'd bet you my bikini you'll never get TFP water from a pool store!

    24' Sharkline Venture De Filter

  9. Back To Top    #9

    Join Date
    Mar 2014
    Location
    Las Vegas
    Posts
    288

    Re: SLAM Question

    Quote Originally Posted by Task View Post
    looks like I've got my weekend planned! case of beer, couple cases of bleach and my pool.
    Just don't forget to put the bleach in the pool and the beer in yourself. I hate it when I mix them up.
    12000 Gallon IG Plaster built 2/15/2014. Jandy 340 sg ft 127 gpm filter, Jandy 1 HP stealth pump. Circupool RJ-45 SWG (overkill). TF-100 with Speed Stir.

  10. Back To Top    #10
    Beens's Avatar
    Join Date
    Jul 2013
    Location
    Virginia Beach, Va
    Posts
    1,171

    Re: SLAM Question

    Quote Originally Posted by jmbradwell View Post
    Just don't forget to put the bleach in the pool and the beer in yourself. I hate it when I mix them up.
    omg

    18' x 48" (42" water depth) Intex Metal Frame 6,700 Gallons
    Hayward Power-Flo LX 1.0 HP pump
    Hayward Pro Series S166T Sand Filter
    Original Intex Floating Skimmer

  11. Back To Top    #11
    jcowart's Avatar
    Join Date
    Jun 2012
    Location
    Labelle, TX
    Posts
    320

    Re: SLAM Question

    Quote Originally Posted by Task View Post
    I'm starting off with 8 gallons of 8.25% bleach. Any guess as to how much I might go through so I can pick up some more in advance?
    Well if you used poolmath and hung your CYA in a sock with a target of 30. 382oz of 8.25% or 3.1 jugs will get you to FC 12 or shock level. It will be 32oz for every 1ppm you drop to maintain FC 12. I would try to test it every two hours the first 8 hours or so. The more you can maintain it at that level the better off you will be.
    17500 gallon Doughboy AGP, Hayward DE filter, waiting for the 1.5hp DB pump to go out.
    Learn to take the advice here and be trouble free or use the pool store's advice. "You can't do both and get very far"

  12. Back To Top    #12
    Task's Avatar
    Join Date
    Sep 2013
    Location
    West Grove, PA
    Posts
    232

    Re: SLAM Question

    Ok, so I'm 4 hours into my SLAM. Should I be expecting my CC to rise? I've been checking my FC and CC every hour. I started at 10am with the following test results:
    Temp - 58 degrees
    FC - 0
    CC - 0
    PH - 7.8
    TA - 130
    CYA - 0
    CH - 150
    So I added the recommended amount of muriatic acid (think it was 1qt) according to pool math to bring my PH down before the SLAM.
    I also hung the recommended 5lbs of CYA from some panty hose in front of my return.
    At 11am, I started the SLAM and added 4 gallons of 8.25% Clorox as stated in pool math.
    At 12pm, my FC was at 16 and my CC was still at 0.
    At 1pm, my FC was down to 10.5 and my CC was at .5
    Plugged my numbers into pool math, and it said to add another gallon of bleach.
    At 2pm, I had 14.5 for my FC, and CC was still holding at .5.
    Now at 3pm, I'm getting an FC of 19.5 and a CC of 0.

    My water seems to be clean, but I can only make out the shadow of the drain in the 8ft end of the pool. Am I doing the tests wrong or am I not doing the SLAM properly?


    16'x32' Inground Vinyl, 21,100 gallons, Hayward 1.5 HP Super Pump, Hayward Pro Series S244T 3.1ft Sand Filter
    TFTestKits, Pool School, ABC's of Pool Water Chemistry, Chlorine/CYA Chart, PoolMath

  13. Back To Top    #13
    Mod Squad JVTrain's Avatar
    Join Date
    Feb 2014
    Location
    Central Minnesota
    Posts
    5,079

    Re: SLAM Question

    If you're testing while the water is circulating then that's a good thing to have low/no CC.

    Your water is really cold right? It might just be that nothing is growing yet, you have very little demand and no CC is hanging around... and you need to filter, filter, filter while you brush, brush, brush! Keep the FC at shock level, run that filter 24x7. Is your filter PSI rising?
    Joel - TFP Moderator - Minnesota - **Become a TFP Supporter!** Helpful Links: ABCs of Pool Water Chemistry - SLAM Procedure - Chlorine/CYA Chart
    40x20 Pool: 32K Gallons * Vinyl * Bleach Chlorination * Hayward S270T Sand Filter * Pentair SuperFlo 1 HP * Teledyne/Laars Heater * AquaVac Tigershark * TF-100 w/ SpeedStir
    Isolated Spa - 345 Gallons

  14. Back To Top    #14
    jcowart's Avatar
    Join Date
    Jun 2012
    Location
    Labelle, TX
    Posts
    320

    Re: SLAM Question

    Don't worry about the CC's when you start. Focus on the first step. Getting your water clear. As your water gets clear and your FC starts to hold your CC's will drop. You may or may not show a high CC during a slam. If your not already, start using the 10ml sample. It cuts down on your regents.
    About the higher FC that was noted. Most laundry bleach now is 121oz. Using 21100 and 4 jugs of 121 I get FC of 15 so your pool maybe a little smaller but that's not a real problem. When the sun is off the pool you can test and dose it, then test about 30 minutes after. Get the difference and then start playing with the gallons to find a match with effects of adding chemicals. It might be closer to 20000. Your not baking a cake so as long as your close on volume and above slam level your good. 19.5 I think might be wasting chlorine to the sun. Don't worry about doing another CYA test till next week. Give it time as long as you just add 80oz. I get 30ppm using 20000 and 28 using 21100. That's close enough. Also brush brush brush.
    17500 gallon Doughboy AGP, Hayward DE filter, waiting for the 1.5hp DB pump to go out.
    Learn to take the advice here and be trouble free or use the pool store's advice. "You can't do both and get very far"

  15. Back To Top    #15
    Task's Avatar
    Join Date
    Sep 2013
    Location
    West Grove, PA
    Posts
    232

    Re: SLAM Question

    The water is at 60 right now. The pump has been running pretty much all day. I've had to backwash twice since I started. I have been using the 10 ML. It takes about 2 hours for the PSI to get to backwash level.


    16'x32' Inground Vinyl, 21,100 gallons, Hayward 1.5 HP Super Pump, Hayward Pro Series S244T 3.1ft Sand Filter
    TFTestKits, Pool School, ABC's of Pool Water Chemistry, Chlorine/CYA Chart, PoolMath

  16. Back To Top    #16
    jcowart's Avatar
    Join Date
    Jun 2012
    Location
    Labelle, TX
    Posts
    320

    Re: SLAM Question

    Looks like your on the right track then. Keep an eye on your pressure and take notes. Your pump really needs to run 24/7 during a slam. If you don't think it will make it through the night without a backwash, run the filter in recirculation if you have that mode on your filter tonight.

    17500 gallon Doughboy AGP, Hayward DE filter, waiting for the 1.5hp DB pump to go out.
    Learn to take the advice here and be trouble free or use the pool store's advice. "You can't do both and get very far"

  17. Back To Top    #17
    Task's Avatar
    Join Date
    Sep 2013
    Location
    West Grove, PA
    Posts
    232

    Re: SLAM Question

    I'm probably a little less then 21100. The pool is 16'x32', with a depth of 3' in one end, and slopes down to an 8' hopper.
    I just took an average depth of 5'6" to figure out my volume, but I guess that's a little off considering the sloping walls.


    16'x32' Inground Vinyl, 21,100 gallons, Hayward 1.5 HP Super Pump, Hayward Pro Series S244T 3.1ft Sand Filter
    TFTestKits, Pool School, ABC's of Pool Water Chemistry, Chlorine/CYA Chart, PoolMath

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •