Become a TFP Supporter Pool Math Forum Rules Pool School
Results 1 to 11 of 11

Thread: SLAM process question

  1. Back To Top    #1

    Join Date
    May 2013
    Location
    Chandler Arizona
    Posts
    78

    SLAM process question

    SLAM - Shock Level And Maintain

    CC level is above 0.5, and the free chlorine (FC) level is zero, started to SLAM the pool.
    Prerequisites:
    You need to have a FAS-DPD chlorine test
    You also need to know your current CYA level 60 ish, and then look up the corresponding FC shock level.
    USING bleach or liquid chlorine when SLAMing.
    Check and adjust the PH to between 7.2 and 7.5.
    Run the pump 24/7 until you are done SLAMing running on recirculate* should I run filter?

    SLAM:
    Measure the FC level= ** 0.1

    Add enough chlorine to bring FC up to shock level ** up to 25

    Repeat steps 1 and 2 as frequently as practical, but not more than once per hour, and not less than twice a day, until:
    CC is 0.5 or lower;** waiting on fas/dpd reading

    You pass an OCLT (ie overnight FC loss test shows a loss of 1.0 ppm or less); **I not sure if i was supposed to test this morning with the fas/dpd?

    And the water is clear.** water has always been clear

    Chlorine additions should be frequent, especially at the beginning. Algae and other organic debris will consume chlorine very rapidly at first. As things progress, you will lose less chlorine each cycle and can add more less frequently.
    ***So last night I added enough to get to 25 FC which is my shock level for my current level of CYA. I did not add more yet... How long do I keep it at shock level? Should I have my SWG running? Should my SWG be off during SLAM? My PH was at 7.3 when I started.
    When do I test with the fas/dpd test and how high should FC be?( always at shock level?)

    Brush the entire pool once a day** will do
    Backwash or clean the filter as needed** will do
    Intex Ultra Frame 18 x 9 x 52 rectangle. 4545 Gallons.
    12 in Krystal Clear™ Sand Filter Pump w/ GFCI.
    Krystal Clear Saltwater System™ w/ GFCI.
    TF-100 Taylor testing.
    K-1000 Taylor testing.

  2. Back To Top    #2

    Join Date
    Jul 2012
    Location
    Herndon, VA
    Posts
    419

    Re: SLAM process question

    What exactly is the question?
    8,000 gallon, in ground, fiberglass pool with a cartridge filter.

  3. Back To Top    #3

    Join Date
    Jan 2013
    Location
    Houston, TX
    Posts
    1,079

    Re: SLAM process question

    should I run filter?

    You should run on filter to filter out any dead algae

    **I not sure if i was supposed to test this morning with the fas/dpd?
    Yes ... If the water is clear bring it up to SLAM - test after sun goes down and again before it comes up.

    ***So last night I added enough to get to 25 FC which is my shock level for my current level of CYA. I did not add more yet... How long do I keep it at shock level?
    Until the water is clear / the algae is dead / you pass the OCLT

    Should I have my SWG running?
    Not for the OCLT ... and optional during the SLAM.

    Should my SWG be off during SLAM?
    Optional except for the OCLT - off for the OCLT.

    My PH was at 7.3 when I started.
    When do I test with the fas/dpd test and how high should FC be?( always at shock level?)


    Always bring it back to shock level.
    TFP Moderator Chris V. ~16K Pool & Spa, 48NSF DE, IG Plaster Circa 2000, Intermatic PE653, Challenger pump with a 2 speed B2984, 20gal stenner chlorine injection, Houston, TX
    One cannot follow Islam and Christianity at the same time, nor can one follow pool store methods and TFP at the same time.
    Pool School -- Pool Math -- TF-Test Kit

  4. Back To Top    #4
    Mod Squad woodyp's Avatar
    Join Date
    Apr 2010
    Location
    East Texas
    Posts
    9,000

    Re: SLAM process question

    Recirculate bypasses the filter.
    16x32x52" Steel Cornelius Miramar AGP Vinyl liner 13,100 gal. Buried 2 ft.
    2 Speed Hayward Power-Flo Matrix 85 g.p.m. 22" 250lb. sand filter hard plumbed
    Pool Rover Jr., Pool Blaster Max, Diver Dave TF100 Test Kit/Speed Stir
    Margaritaville Frozen Concoction Maker, Liqour Chiller, & Drink Mixer & Party Tub----Collect 'um all!

  5. Back To Top    #5

    Join Date
    May 2013
    Location
    Chandler Arizona
    Posts
    78

    Re: SLAM process question

    So thanks guys for all the great info you've armed me with. Now family is mad at me for starting the SLAM process when the pool was perfectly clear. I was worried because my FC dropped to 0 then would only rise to 1.0. Is it safe to swim in SLAM water 25:FC?
    -Once my SLAM process is complete. And the OCLT is completed. Do I run my SWG and see if FC stays steady between 3-5? and let the liquid chlorine slowly dissapate?
    Intex Ultra Frame 18 x 9 x 52 rectangle. 4545 Gallons.
    12 in Krystal Clear™ Sand Filter Pump w/ GFCI.
    Krystal Clear Saltwater System™ w/ GFCI.
    TF-100 Taylor testing.
    K-1000 Taylor testing.

  6. Back To Top    #6
    Richard320's Avatar
    Join Date
    Jan 2010
    Location
    San Dimas, CA (LA County)
    Posts
    18,768

    Re: SLAM process question

    Quote Originally Posted by Ame
    So thanks guys for all the great info you've armed me with. Now family is mad at me for starting the SLAM process when the pool was perfectly clear. I was worried because my FC dropped to 0 then would only rise to 1.0. Is it safe to swim in SLAM water 25:FC?
    -Once my SLAM process is complete. And the OCLT is completed. Do I run my SWG and see if FC stays steady between 3-5? and let the liquid chlorine slowly dissapate?
    Yes, it's safe to swim up to shock level. If the water is clear, you'll probably pass the overnight test tomorrow morning and then just let FC drop by itself.
    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!

  7. Back To Top    #7

    Join Date
    May 2013
    Location
    Chandler Arizona
    Posts
    78

    Re: SLAM process question

    So my SLAM process seems to have gone well.
    I am now maintaining FC between 7-8 and will be reducing my SWG run time, going to keep it approx FC=5.
    My CC has bee at .5 consistently.
    But 1st I believe I need to raise my CYA a bit from 55 to 70.( I kept it lower during my SLAM on purpose, I knew it was low, And on your advise did not increase until SLAM was done.)
    My PH is a little high at 7.8 but I think that adding CYA lowers PH right? should I get my CYA up 1st before changing my SWG run time?
    Intex Ultra Frame 18 x 9 x 52 rectangle. 4545 Gallons.
    12 in Krystal Clear™ Sand Filter Pump w/ GFCI.
    Krystal Clear Saltwater System™ w/ GFCI.
    TF-100 Taylor testing.
    K-1000 Taylor testing.

  8. Back To Top    #8
    Richard320's Avatar
    Join Date
    Jan 2010
    Location
    San Dimas, CA (LA County)
    Posts
    18,768

    Re: SLAM process question

    Quote Originally Posted by Ame
    So my SLAM process seems to have gone well.
    I am now maintaining FC between 7-8 and will be reducing my SWG run time, going to keep it approx FC=5.
    My CC has bee at .5 consistently.
    But 1st I believe I need to raise my CYA a bit from 55 to 70.( I kept it lower during my SLAM on purpose, I knew it was low, And on your advise did not increase until SLAM was done.)
    My PH is a little high at 7.8 but I think that adding CYA lowers PH right? should I get my CYA up 1st before changing my SWG run time?
    You have things figured out.

    If you plug your numbers into http://www.poolcalculator.com/ then scroll down to Effects of Adding Chemicals and plug in the quantity of CYA it calls for, you'll see what effect it should have on pH. Hint: it should lower it almost .3
    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!

  9. Back To Top    #9

    Join Date
    May 2013
    Location
    Chandler Arizona
    Posts
    78

    Re: SLAM process question

    Cool thanks for the CYA hint!!
    Intex Ultra Frame 18 x 9 x 52 rectangle. 4545 Gallons.
    12 in Krystal Clear™ Sand Filter Pump w/ GFCI.
    Krystal Clear Saltwater System™ w/ GFCI.
    TF-100 Taylor testing.
    K-1000 Taylor testing.

  10. Back To Top    #10

    Join Date
    Apr 2013
    Location
    East Texas
    Posts
    20

    Re: SLAM process question

    I am wondering why the CYA needs to go up? Just curious.
    Doughboy 1.5 Powerline & AquaView sand filter and BBB. 12k gallons in 24' vinyl AG.

  11. Back To Top    #11
    pwrstrk's Avatar
    Join Date
    Aug 2012
    Location
    Elverson Pa.
    Posts
    4,758

    Re: SLAM process question

    She has a SWG. Recommended CYA level for a SWG is 70-80.


    Jeff
    24'x54" AG Morada RTR (by wilbar) 13'500 gal. Hayward Powerflo Matrix 1hp 2 speed. Hayward Perflex EC65 DE filter.

Posting Permissions

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