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Thread: Attempting to SLAM and want to do it right

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    Attempting to SLAM and want to do it right

    First year taking over the pool and it has not gone as well as I hoped. I've been fighting algae problems recently, due to time away from home, and the stores have not helped me out at all. I've managed to read enough here to get started, but may still have some things wrong. The algae is currently light in color and amount.

    I tested and here are the numbers:

    FC - 2.5
    CC - .5
    AK - 130
    CH - 160
    CYA - 100
    Ph - 7.5

    Here is what I plan to do:

    - Replace the water with 60% new water. Got this from the calculator.
    - Brush/Vacuum as best as possible
    - Get the Ph to 7.2
    - Test the FC and go nuts with the bleach, checking at least twice a day and adding as needed especially in the beginning
    - Backwash/Clan the filter as needed

    I would then be looking for CC at .5 or lower, pass an OCLT and the water is clear.

    If there is anything I'm missing or I've got something completely wrong I'd like to know before I get started. Any suggestions are welcome as well. Thanks for building the great site and am looking forward to learning how to take care of my pool properly. Sorry for the length, wanted to make sure I was thorough. Thanks!
    10K gal - Above Ground - Vinyl - Sand Filter - Taylor K-2006 Test Kit

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    Mod Squad jblizzle's Avatar
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    Re: Attempting to SLAM and want to do it right

    Welcome to TFP!!!

    Sounds like a pretty good plan ... except for the "go nuts" parts Always test and dose to the appropriate level using PoolMath ... although I think you understand that.

    Backwash the filter when the pressure goes up 20-25% over the clean pressure.

    What test kit are you using?
    That CC number does not make sense. The FAS-DPD tests in increments of 0.5ppm.
    Jason, TFP Moderator
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    Re: Attempting to SLAM and want to do it right

    Thanks for the quick reply!

    I meant to put .5 for the CC. sorry for the confusion. I've fixed it now.

    Another question, It has been a very mild summer and is already almost time to close up the pool for the winter sometime next month. Is it worth slamming or should I just close it and open it with a SLAM next year or will it make the problem worse?
    10K gal - Above Ground - Vinyl - Sand Filter - Taylor K-2006 Test Kit

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    Mod Squad jblizzle's Avatar
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    Re: Attempting to SLAM and want to do it right

    Well, if you SLAM now and close and open in the spring properly (see Pool School), then you will open to a clean pool. Or you can always let the pool go green and deal with it in the spring ...
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
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    Mod Squad kimkats's Avatar
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    Re: Attempting to SLAM and want to do it right

    I would go ahead and SLAM it. BUT I also leave my pool open year round here in Florida.

    What test kit are you using?

    Kim
    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: Attempting to SLAM and want to do it right

    Forgot to mention it again, I'm using the Taylor K-2006 kit.
    10K gal - Above Ground - Vinyl - Sand Filter - Taylor K-2006 Test Kit

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    Mod Squad jblizzle's Avatar
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    Re: Attempting to SLAM and want to do it right

    Adding that to your signature will remind us as well.
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
    500 sqft Heliocol solar panels, ThePoolCleaner, TF-100 test kit w/ SpeedStir
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    Mod Squad kimkats's Avatar
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    Re: Attempting to SLAM and want to do it right

    Good! You have your own test kit. That is a good start!

    I would SLAM it just because I THINK it would make it easier to open next Spring. I am not sure if there is any truth in my thoughts but...................I would have to at least try to close it clear and clean.

    Kim
    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: Attempting to SLAM and want to do it right

    After you get your pH set to 7.2, and start adding bleach for the SLAM, you do not need to do a full round of tests, do just FC and CC. It will save on your regents.

    We would like pictures... Before, During, and After. You can even be doing a happy dance in the After pics...... lol..
    Randy H.

    Intex 18' X 48"
    G.A.M.E. Sandpro 75 Sand Filter (Single Speed 3/4 HP, 75 lbs sand, 2650 GPH, 7-way valve)

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    Attempting to SLAM and want to do it right

    I think it would be a good ideas to SLAM before closing. The algae will live on until the water temp drops below 60F and so you'll be better off in the spring if you kill it all now. Otherwise it grows and dies over winter and the water is just a soup of dead algae and organics which can stick to and stain your liner.



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    Re: Attempting to SLAM and want to do it right

    Sorry for not updating sooner, having enough problems finding time to make sure I test the pool enough during the process. I have kept notes throughout and believe I may be done or close to it. Here is everything I have recorded. It's possible I forgot to write one down but the chemical amounts were always correct to take it to the required Shock FC level.

    The first thing I did was drain the pool and replace at least 60% of the water with new water.

    Here are two pictures of the pool before it was filled back up.
    http://i.imgur.com/48jwCOT.jpg
    http://i.imgur.com/inzyXCh.jpg
    (not the best but you get the idea)

    after the pool was filled back up these were the results.

    FC - .5
    CC - 0
    CYA - 50 (only thing I tried to change so far)
    CH - 140
    AK - 90
    PH - 7.0

    I brought the PH up to 7.2 as recommended and after that added the bleach to bring it up to 20 FC (based on the 50 CYA level) I used the liquid shock from the pool store as it's 12.5% instead of 6%.

    I tested the FC and CC going forward since I started this process on Sunday (8/31). My times are a bit strange as my work schedule varies.

    Sun 9:30am
    FC - 7 (brought it up to 20)
    CC - 0.5

    4:30pm
    FC - 7.5 (brought up to 20)
    CC - 0.5

    10:15pm
    FC - 12.5 (left as is to test overnight loss)
    CC - 0.5

    Mon 8:30am
    FC - 10 (brought up to 20)
    CC - 0.5

    4pm
    FC - 5.5 (brought up to 20)
    CC - Don't have this one, someone else tested for me, seeing the trend I assume 0.5

    11:30pm
    FC - 14 (Left it at 14)
    CC - 0.5

    Tue 8am
    FC - 12.5
    CC - 0.5

    7:15pm Decided to check CYA again as the water was looking much clearer.
    CYA - 30 (Shock FC level is now 12 instead of 20)
    FC - 10 (brought up to 12)
    CC - 0.5

    9:30pm
    FC - 10.5 (left it to test overnight)
    CC - 0.5

    Wed 9am
    FC - 11.5 - This seems strange as it increased the FC by 1 and I didn't add any bleach. I can only guess this is because it rained overnight.
    CC - 0.5

    9:15pm
    FC - 6 (brought up to 12)
    CC - 0.5

    At this point I took some more pictures.
    http://i.imgur.com/GPjLVeL.jpg
    http://i.imgur.com/Hbmt8gx.jpg

    Thu 11 am
    FC - 8.5 (brought up to 12)
    CC - 0.5

    8:15 pm
    FC - 6.5 (brought to 12)
    CC - 0.5

    Fri 10:15 am
    FC - 9.5
    CC - 0.5

    My last test shows an overnight loss of 2.5, however the sun had been out for a few hours at this point.

    Should I continue to bring the FC to 12 and wait for a perfect overnight loss test are does this seem like it's on track and I can let it come down to the regular level.

    Thanks again for everyone's help!
    10K gal - Above Ground - Vinyl - Sand Filter - Taylor K-2006 Test Kit

  12. Back To Top    #12

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    Attempting to SLAM and want to do it right

    When was the last time you cleaned or back washed your filter? Dirty filters with lots of dead algae can lead to FC loss.

    You must be at 1ppm or less for OCLT. Sorry, but you have to keep SLAMing





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    Re: Attempting to SLAM and want to do it right

    And the morning test needs to be done before Sunrise if not, it's pretty much invalid.
    Pool size: 24000gal inground Vinyl-Taylor k-2006 and k-1766 test kits and-speed stir
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    Re: Attempting to SLAM and want to do it right

    Quote Originally Posted by timerguy View Post
    And the morning test needs to be done before Sunrise if not, it's pretty much invalid.
    I wouldn't say "before the rooster crows" as my pool is shaded until about 8:30am. I think morning light is ok as long as the pool water has no direct sun light in it.

    However, if the pool gets sun immediately, then it's definitely before the rooster crows



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    Re: Attempting to SLAM and want to do it right

    I did backwash the filter at one point, but how long should I do this for or how do I know when it is done?
    Edit: the water was clear coming out during the backwash.

    Also my pool stays shaded until about 9:30 since the sunrise hits the front of the house. It's tougher for me to wake up any earlier since I work late nights, but I will do what I can.

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    Re: Attempting to SLAM and want to do it right

    Well, normally you should record your starting pressure and then backwash when the filter pressure gauge reads 25% over START pressure. Most filter gauges have a rotatable plastic face ring with the words "START" and "SERVICE" printed on it so you can mark your starting point.

    When SLAMing, I typically backwash my DE filter when I hit 20% over nominal because your killing so much algae and generating so much waste that it just works better.



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    Re: Attempting to SLAM and want to do it right

    Anytime I have looked at the filter it is between 20-25%. Before and during the slam. It has never changed unless I backwash/waste/rinse whatever. It drops but then when set to filter it's back up to the 20s.

  18. Back To Top    #18
    Mod Squad jblizzle's Avatar
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    Re: Attempting to SLAM and want to do it right

    The pressure can not always be at 20-25% ... that is not a unit of measure. The gauge shows you psi.

    If it is at 20psi when clean, then you would need to backwash again at 25psi which is 25% above 20psi.
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
    500 sqft Heliocol solar panels, ThePoolCleaner, TF-100 test kit w/ SpeedStir
    Pool School + Test Kit + PoolMath = A TROUBLE FREE POOL
    If you found TFP helpful and we saved you money ... Become a TFP Supporter!

  19. Back To Top    #19

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    Attempting to SLAM and want to do it right

    What's the actual PSI reading when you start?

    Depending on the age of your filter, the gauge could be bad and in need of replacement. You can buy cheap ones from the pool store that read +\- 1 psi or TFTestKits.net sells better ones that read +\- 0.5 psi





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    Re: Attempting to SLAM and want to do it right

    Quote Originally Posted by jblizzle View Post
    If it is at 20psi when clean, then you would need to backwash again at 25psi which is 25% above 20psi.
    Thank you, this is what I needed to know. Being given a pool with no prior knowledge this is all stuff that blows over my head until explained.

    As far as the slam goes at night I test the FC, I bring it up to 12 right after sunset and hope it's at 11 or less before sunrise. Is this correct?

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