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Thread: Swg slam

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    Swg slam

    Also read the Water Balance for SWGs and it suggested the following levels:
    FC 4-6 ppm (currently too low, @ 3.5)
    PH 7.5-7.8 (currently too high, @ +8)
    TA 60-80 (currently now too high, @ 90)
    CH


    • 220-320 for fiberglass (currently much lower, @ 80)
    • CYA 70-80 (currently much lower, possibly below 30)
    • Salt 200-400 ppm ABOVE recommended optimum level (currently correct @ 200+)
    • Borates 30-50 ppm (optional)(none)


    SLAM says to lower PH to 7.2 though. is that correct?

    - - - Updated - - -

    In addition should I bring my CYA up to 60 before slamming as it is very low and may not be being read correctly because of this
    gallons = 15,250 ; IG Trilogy fiberglass ; Pentair Optiflo High Performance Pump 2sp pump 1-1 &1/2 hp; Pentair Clean & Clear cartridge filter 150 sq/ft; installed 5/20/2016 ; SWG - Intellichlor Model IC15 - PP40; Maytronics Dolphin Active 20 robotic cleaner; Taylor K-2006C (FAS-DPD chlorine test) ; city water

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    Re: Swg slam

    Yes, you'll want to lower your PH to 7.2 before you start SLAM. Keep in mind, if you are "+8", you could be 8 or you could be 9. So add some acid and then retest in 30 minutes (with pump running).

    Also, they say to turn of your SWG for the SLAM

    DO NOT raise CYA until after SLAM is over

    Wait, I just noticed that you do not have a proper test kit yet?!?
    15,000 gallon free form Viking fiberglass pool. Hayward Star-Clear Plus C12002 cartridge filter. Hayward Swim Pure Plus T-15 SWG. Testing with TF-100 Kit. 2 speed 1.5HP Supreme pump. Dolphin Nautilus robotic cleaner

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    Mod Squad tim5055's Avatar
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    Re: Swg slam

    Do you have a test kit? You signature says planning on getting one.

    No, if you are involved in a SLAM you want to start with pH at 7.2 and CYA of about 30. The higher the CYA you start with them more liquid chlorine you need. Also, during the SLAM turn off the SWG and use all liquid.
    TFP Moderator 39 X 18 23,000(ish) freeform gunite; built 2007ish; Pentair Triton II TR100 600lb Sand filter; 2 HP Pentair pump with 2.2 HP AO Smith single speed motor; 2 skimmers, 1 main drain, 4 returns w/waterfall, Stenner 45MHP2 3GPD running@ 60% - 15 gal Tank; heated by the sun CYA 200+ when I started - 50 now. Dolphin Supreme M5 Pool Cleaner. Hot Springs SX Spa, 285 gallon

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    Mod Squad YippeeSkippy's Avatar
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    Re: Swg slam

    Over time there has been conflicting ideas on how much calcium a fiberglass pool needs. Unlike a vinyl pool that needs none, its hard to know if your fiberglass pool's gel coat contained calcium or not.

    So to play it safe we're recommending a lowish level of calcium which should be enough if its needed yet not so much that it causes any problems with scale.
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    Mod Squad pooldv's Avatar
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    Re: Swg slam

    Here is the process to SLAM, it seems like you need to review it some more.
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    Re: Swg slam

    I updated my test kit. sorry forgot to do this. I also dropped my ph down to 7.2 with muriatic acid last evening and began to add chlorine to shock. My FC level this morning was only to 11.5 though after using pool math. Also, the ph rose this morning to 7.6, from what I am reading because of the addition of the chlorine. Below are current #'s:

    Also read the Water Balance for SWGs and it suggested the following levels:
    FC 4-6 ppm (currently too low, @ 11.5)
    PH 7.5-7.8 (currently @ 7.6 this morning ****This is post it being @ 7.2 last night and when I started slam with liquid bleach)
    TA 60-80 (currently now too high, @ 90)
    CH 220-320 for fiberglass (currently much lower, @ 80)CYA 70-80 (currently much lower, possibly below 30)
    Salt 200-400 ppm ABOVE recommended optimum level (currently correct @ 200+)
    Borates (none)

    From this it looks like I need to add muriatic acid again to get it to 7.2 and more chlorine. Do you guys agree? SWG FC level should be at the below level for me:

    SWG Pools

    CYA (Stabilizer) Minimum FC Target FC Shock FC
    60*
    3
    4
    24
    gallons = 15,250 ; IG Trilogy fiberglass ; Pentair Optiflo High Performance Pump 2sp pump 1-1 &1/2 hp; Pentair Clean & Clear cartridge filter 150 sq/ft; installed 5/20/2016 ; SWG - Intellichlor Model IC15 - PP40; Maytronics Dolphin Active 20 robotic cleaner; Taylor K-2006C (FAS-DPD chlorine test) ; city water

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    Mod Squad YippeeSkippy's Avatar
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    Re: Swg slam

    No more MA at this time.... when your FC is over 10 the pH test is inaccurate, often reading high. Ignore it until after the SLAM.
    My Amazon Smile for November12K Fiberglass IG, Infinity 4000 automatic cover, SWCG, Hayward Sand Filter, Hayward 1.5 Pump, Doheny Discovery Robot, Savi Melody LED pool lights, outdoor speakers and other assorted doo-dads. Sundance Altamar Hot Tub.
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    Re: Swg slam

    cool. I will just be adding chlorine for now then. thx.
    gallons = 15,250 ; IG Trilogy fiberglass ; Pentair Optiflo High Performance Pump 2sp pump 1-1 &1/2 hp; Pentair Clean & Clear cartridge filter 150 sq/ft; installed 5/20/2016 ; SWG - Intellichlor Model IC15 - PP40; Maytronics Dolphin Active 20 robotic cleaner; Taylor K-2006C (FAS-DPD chlorine test) ; city water

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    Re: Swg slam

    I guess my concern is that my CYA is so low, and the SWG Pool Chlorine / CYA Chart shows it starting at 60 CYA and shock level of FC @ 24. Should my shock level be lower b/c of the low CYA, or am I still striving to reach FC shock level of 24 when slamming?
    gallons = 15,250 ; IG Trilogy fiberglass ; Pentair Optiflo High Performance Pump 2sp pump 1-1 &1/2 hp; Pentair Clean & Clear cartridge filter 150 sq/ft; installed 5/20/2016 ; SWG - Intellichlor Model IC15 - PP40; Maytronics Dolphin Active 20 robotic cleaner; Taylor K-2006C (FAS-DPD chlorine test) ; city water

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    Mod Squad YippeeSkippy's Avatar
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    Re: Swg slam

    During a SLAM you want ideally for your CYA to be 30, because if it were more you'd need more chlorine to reach that higher SLAM level. If it is less than 30, the sun has too much power to sap your FC. The CYA stabilizes your FC so that its protected from the sun and available to work for you slaying the algae beasts.

    Get a bit more CYA in that pool and consider your SLAM level to be 12 (which corresponds to CYA of 30)
    My Amazon Smile for November12K Fiberglass IG, Infinity 4000 automatic cover, SWCG, Hayward Sand Filter, Hayward 1.5 Pump, Doheny Discovery Robot, Savi Melody LED pool lights, outdoor speakers and other assorted doo-dads. Sundance Altamar Hot Tub.
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    Re: Swg slam

    Your SLAM right now is just a normal chlorine pool until your done with the SLAM, then change to SWG recommendations

    so 30 CYA and 12 FC for your SLAM is perfect

    only test FC and CC using the 10ml sample to save on reagents
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  12. Back To Top    #12

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    Re: Swg slam

    so I shouldn't be trying to reach the swg levels in slam? I should be shooting for the regular pool level of
    30
    CYA
    FC
    12
    gallons = 15,250 ; IG Trilogy fiberglass ; Pentair Optiflo High Performance Pump 2sp pump 1-1 &1/2 hp; Pentair Clean & Clear cartridge filter 150 sq/ft; installed 5/20/2016 ; SWG - Intellichlor Model IC15 - PP40; Maytronics Dolphin Active 20 robotic cleaner; Taylor K-2006C (FAS-DPD chlorine test) ; city water

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    Mod Squad zea3's Avatar
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    Re: Swg slam

    Yes, slam according to your current CYA level. Also leave the SWG off during the slam. It will save wear and tear on the cell.
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    Re: Swg slam

    No you reduce the amount of chlorine required to hold a lower FC for a lower CYA level (i.e. 30) and then raise the CYA when you have completed the SLAM
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