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Thread: question about slamming

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    question about slamming

    This will be my first time slamming...I'm opening for the season and my water is green, so just have a question. It says to raise the FC shock level to your current CYA level. I have a swg pool, and right now my current cya level is 20. Do I just raise the fc level to 10 with my swg off? Or raise the cya level to at least 60 before I start to raise my fc level?

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    Mod Squad JVTrain's Avatar
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    Re: question about slamming

    Keep that CYA low until you pass the SLAM criteria. Low CYA is great for SLAMing. SWG off during SLAM.
    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
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    Re: question about slamming

    Quote Originally Posted by JVTrain View Post
    Keep that CYA low until you pass the SLAM criteria. Low CYA is great for SLAMing. SWG off during SLAM.
    Awesome, thanks for the quick reply!

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    Mod Squad JVTrain's Avatar
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    Re: question about slamming

    To be more complete, are you using an Approved Test Kit?

    Add your pool specs, equipment and test kit to your signature so the experts (that know more than I do) can easily help you when you post.

    When you do decide to add CYA, be aware results at 20 or less have potential for error. Therefore, use PoolMath to calculate how much you should add to get to 60 ppm CYA, if your actual final target is 70. Add that much, wait a week and retest. Go from there. You'd rather shoot low on CYA and bump up slowly when you get close as there is no way to lower without draining.
    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

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    Re: question about slamming

    Thanks again and yea I am using TF 100 test kit.
    18' above ground pool - 7500 gallons
    Hayward Aqua-trol SWG
    TF-100 test kit with speedstir

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    Re: question about slamming

    SLAM to 10! Brush the pool and if there is anything on the bottom, rake it with a leaf rake to get it out. If you have steps in the pool, get them out as they harbor junk behind them. Sweep the pool and keep SLAM'ing!

    Do you have any test results we can have a look at?
    I'd bet you my bikini you'll never get TFP water from a pool store!

    24' Sharkline Venture De Filter

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    Re: question about slamming

    Quote Originally Posted by Casey View Post
    SLAM to 10! Brush the pool and if there is anything on the bottom, rake it with a leaf rake to get it out. If you have steps in the pool, get them out as they harbor junk behind them. Sweep the pool and keep SLAM'ing!

    Do you have any test results we can have a look at?
    I'm still in the process of getting my FC up. But my numbers were as of last night...

    FC 1.5
    CC .5
    PH 7.3
    TA 60
    CYA is 10

    I did put some more bleach in before going to bed, (added the amount according to poolmath) this morning my FC was at 6, I just added some more bleach and will check it in a couple hours. Once I do get it to shock level, what's the next step? Should I then add some stabilizer to get my cya up? And then perform an OCLT test tonight?
    18' above ground pool - 7500 gallons
    Hayward Aqua-trol SWG
    TF-100 test kit with speedstir

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    Smykowski's Avatar
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    Re: question about slamming

    Test and redose as often as necessary to keep your FC at 10. Do this for as long as it takes until you pass all three criteria to call the SLAM complete.
    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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    Re: question about slamming

    Ok thanks, and once the slam is complete, then that is when I should raise my cya?
    18' above ground pool - 7500 gallons
    Hayward Aqua-trol SWG
    TF-100 test kit with speedstir

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    Re: question about slamming

    The more you keep you FC at SLAM level the faster you will clear your pool up. IF you can test every hour and add bleach as needed to get to SLAM level. After a while you will find that your levels are holding better so you can back off of the testing. You will see a pattern with your pool.

    Good luck!
    TFP Moderator 33x52 round AG 25,600 gals Sand Filter 1.5hp Pump - 2 Speed, SLAM, Pool School, Recommended Levels, Recommended Chemicals, Pool Math, Chlorine/CYA Chart, TF-100 Test Kit

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    Re: question about slamming

    Ideally, you should get your CYA up to 30 now and adjust your SLAM value accordingly. At a CYA of only 10, you will be losing a lot of chlorine to sunlight.
    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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    Mod Squad JVTrain's Avatar
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    Re: question about slamming

    Read more PoolSchool! Add enough cya to get to 30 but realize you don't need to bother testing for it for at least several days. Takes that long to test for it accurately.

    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
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    Re: question about slamming

    So I think I am almost there. But still something in the pool, I imagine it because I haven't had a chance to vacuum, I had to order another one something wrong with mine, should be here Wednesday. I have been brushing though and using a leaf net to get the leaves out of the bottom. My question is, my FC is 11 right now, a drop from 15 last night, should I wait until it drops below 10 to add more bleach?

    Here are my numbers:

    FC = 11
    CC = .05
    PH = 7.2
    TA = 53
    CYA = added 4 lbs of it yesterday to bring it up to around 30.
    18' above ground pool - 7500 gallons
    Hayward Aqua-trol SWG
    TF-100 test kit with speedstir

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    Mod Squad JVTrain's Avatar
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    Re: question about slamming

    Now that the CYA is in the water, assume you have 30 CYA. Keep that FC at 12.
    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

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    Re: question about slamming

    I have another question, my pressure from the return seems to be really low for the last couple days. I added the CYA through the skimmer slowly, I assume that is the issue, that it just hasn't all dissolved yet, should I be concerned, or just let the pump continue to run for a week or so?

    And also, after I'm done slamming, when should I turn my swg on, when the FC drops down to normal levels?
    18' above ground pool - 7500 gallons
    Hayward Aqua-trol SWG
    TF-100 test kit with speedstir

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    Mod Squad JVTrain's Avatar
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    Re: question about slamming

    You put the cya granules directly in the skimmer? We maybe should have been more specific about adding cya. It should go in a sock (or 2 or 3) and either then put in a skimmer or hung in front of a return (ideal). Adding directly to skimmer can indeed cause clogging, build up in your filter and you might even backwash out a good amount of it if it doesn't dissolve. CYA takes several hours or longer to dissolve depending on temperature.

    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

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    Re: question about slamming

    Yea, I've read that it shouldn't matter though if you put it direct in skimmer or not, but the preferred is a sock. The directions on the container even said to pour direct in skimmer, Just not to backwash for 48-72 hours, so figure it couldn't hurt. So should I just let the pump continue to run for a week or so and if doesn't improve backwash then? Or any other thing I should do?
    18' above ground pool - 7500 gallons
    Hayward Aqua-trol SWG
    TF-100 test kit with speedstir

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    Mod Squad JVTrain's Avatar
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    Re: question about slamming

    Yeah. If you put it right in the skimmer, I'd avoid backwashing as long as you can. Give it plenty of time to dissolve. Has your pump pressure spiked up at all?

    I'm not overly familiar with SWG but I would say turn it on when you've passed SLAM criteria and FC levels have dropped to close to your target FC based on CYA.
    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

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    Re: question about slamming

    Thanks for all your help. So here are my numbers as of today.

    FC = 11
    CC = .5
    TA = 80
    CYA = 60
    PH = 7.2
    CH = 110

    So my plan now is just to let my FC fall down to around 4 then turn on my SWG, I guess I should raise my PH also. But all the other numbers look fine to me. Does everything look good? The water is clear and OCLT has passed.
    18' above ground pool - 7500 gallons
    Hayward Aqua-trol SWG
    TF-100 test kit with speedstir

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    Re: question about slamming

    Congratulations!

    I'd leave the pH alone. The SWG will take care of raising it. So will a bunch of splashing kids.
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
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