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Thread: First SLAM (woohoo!)

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    pinguy's Avatar
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    First SLAM (woohoo!)

    Peeled off the cover today to some slightly cloudy water.



    CH: 325
    TA: 110
    PH: 8.2+
    Salt: 1800
    FC: 0
    CYA: 40

    Added some MA, going to the store to grab bleach and salt shortly.

    The pool vac is picking up a lot of clear crystals. Is this salt that has settled over the winter?
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    Re: First SLAM (woohoo!)

    Salt (NaCl) does not precipitate out of pool water. I would not buy salt if I were you. Your water is likely much too cold for an SWG to run so just manually chlorinate and don't bother adjusting the salt until it is warmer.
    Matt
    16k IG PebbleTec pool, 650gal spa, spillway and waterfall, 3HP IntelliFlo VS / 1.5HP WhisperFlo, Pentair QuadDE-100 filter, IC40 SWCG, MasterTemp 400k BTU/hr NG heater, KreepyKrauly suction-side cleaner Dolphin S300i robot, EasyTouch controls, city water, K-1001, K-2006 and K-1766 test kits, Mannitol test for borates

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    Re: First SLAM (woohoo!)

    Quote Originally Posted by JoyfulNoise View Post
    Salt (NaCl) does not precipitate out of pool water. I would not buy salt if I were you. Your water is likely much too cold for an SWG to run so just manually chlorinate and don't bother adjusting the salt until it is warmer.
    I'll wait on the salt then. I was expecting to need to add some due to dilution.

    Water temp is about 55 now, what is the lower bound for a SWG?

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    First SLAM (woohoo!)

    Pentair's cut off at 58-60F. Even so, at low temps below 70F an SWG will not be very efficient. You should check your owners manual but I would just keep the SWG off until your water is consistently above 65F. Manual chlorination will be more than adequate especially at cold water temps since algae is basically dormant at temps below 60F.

    Adjust the salt later and measure it with a K-1766 test kit. The SWG salinity readout is not as accurate.

    I suspect those clear crystals are probably some kind of carbonate scale, like calcium carbonate. Scoop some up and pour a few drops of muriatic acid on them. If they fizzle and bubble, it's a carbonate.
    Matt
    16k IG PebbleTec pool, 650gal spa, spillway and waterfall, 3HP IntelliFlo VS / 1.5HP WhisperFlo, Pentair QuadDE-100 filter, IC40 SWCG, MasterTemp 400k BTU/hr NG heater, KreepyKrauly suction-side cleaner Dolphin S300i robot, EasyTouch controls, city water, K-1001, K-2006 and K-1766 test kits, Mannitol test for borates

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    Re: First SLAM (woohoo!)

    Welcome to the SLAM club! I don't turn my SWG back on until the water gets to 70, I manually dose with bleach.
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    Re: First SLAM (woohoo!)

    Added 8 gallons bleach. That's all Aldi had. A local pool store has 5 gallon carboys of 12.5% chlorine that they will deliver for $14.50. I think I'm going to go that route.
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    Re: First SLAM (woohoo!)

    That 8 gallons only took it up to 10FC. Added another 2.5gallons of 12.5% liquid chlorine from the pool store. Also added another 1/2 gallon MA since the PH did not budge.
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    Re: First SLAM (woohoo!)

    WOW ... just a few hours later and things are already looking significantly better. Still cloudy but I think it will be crystal clear in no time.



    I added another 2.5gal of 12.5% Chlorine, and a 3rd gallon of MA (PH still off the chart).
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    Re: First SLAM (woohoo!)

    Now remember, pH gives a false (high) reading when the FC is over 10, so during a SLAM, don't bother testing pH anymore until the SLAM is over or you allow the FC to drop below 10. Other than that, nice! Stay with it though. Don't slack early just because the water looks better. Maintain until you pass ALL 3 criteria.
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    Re: First SLAM (woohoo!)

    Quote Originally Posted by Texas Splash View Post
    Now remember, pH gives a false (high) reading when the FC is over 10, so during a SLAM, don't bother testing pH anymore until the SLAM is over or you allow the FC to drop below 10. Other than that, nice! Stay with it though. Don't slack early just because the water looks better. Maintain until you pass ALL 3 criteria.
    I forgot about that, oops.
    Helpful Links: Pool Chemistry 101 - Recommended Levels - Recommended Chemicals - FC/CYA Chart - SLAM Instructions - Pool Math
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    Re: First SLAM (woohoo!)

    What's your FC level right now?
    Matt
    16k IG PebbleTec pool, 650gal spa, spillway and waterfall, 3HP IntelliFlo VS / 1.5HP WhisperFlo, Pentair QuadDE-100 filter, IC40 SWCG, MasterTemp 400k BTU/hr NG heater, KreepyKrauly suction-side cleaner Dolphin S300i robot, EasyTouch controls, city water, K-1001, K-2006 and K-1766 test kits, Mannitol test for borates

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    Re: First SLAM (woohoo!)

    Quote Originally Posted by JoyfulNoise View Post
    What's your FC level right now?
    16. I may bump it up a bit more since I think my CYA is closer to 50 than the 40 I said earlier.
    Helpful Links: Pool Chemistry 101 - Recommended Levels - Recommended Chemicals - FC/CYA Chart - SLAM Instructions - Pool Math
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    Re: First SLAM (woohoo!)

    Before you do, do this -

    Take a water sample and dilute it 1:1 with DISTILLED WATER. Then test your pH. It should give you a fairly accurate read of your pH.
    Matt
    16k IG PebbleTec pool, 650gal spa, spillway and waterfall, 3HP IntelliFlo VS / 1.5HP WhisperFlo, Pentair QuadDE-100 filter, IC40 SWCG, MasterTemp 400k BTU/hr NG heater, KreepyKrauly suction-side cleaner Dolphin S300i robot, EasyTouch controls, city water, K-1001, K-2006 and K-1766 test kits, Mannitol test for borates

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    Re: First SLAM (woohoo!)

    Quote Originally Posted by JoyfulNoise View Post
    Before you do, do this -

    Take a water sample and dilute it 1:1 with DISTILLED WATER. Then test your pH. It should give you a fairly accurate read of your pH.
    Just tried. The distilled water had a PH of 7.2. A 50/50 mix still showed 8.2.
    Helpful Links: Pool Chemistry 101 - Recommended Levels - Recommended Chemicals - FC/CYA Chart - SLAM Instructions - Pool Math
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  15. Back To Top    #15
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    Re: First SLAM (woohoo!)

    Quote Originally Posted by pinguy View Post
    Just tried. The distilled water had a PH of 7.2. A 50/50 mix still showed 8.2.
    Yup. Distilled water has a pH close to 7 and nearly zero TA. When you dilute your high alkalinity pool water with it, it cuts the FC in half but doesn't change the pH because your pool water's alkalinity absorbs the excess hydrogen ions from the distilled water...in other words, your water's TA buffers against a pH change. This way, you can get a more accurate read of you pH at high FC.

    So, basically your pH is above 8.2 but that could be temporary from all of the bleach you've been adding. You can keep trying to bring it down or wait until the SLAM is over. Your choice.
    Matt
    16k IG PebbleTec pool, 650gal spa, spillway and waterfall, 3HP IntelliFlo VS / 1.5HP WhisperFlo, Pentair QuadDE-100 filter, IC40 SWCG, MasterTemp 400k BTU/hr NG heater, KreepyKrauly suction-side cleaner Dolphin S300i robot, EasyTouch controls, city water, K-1001, K-2006 and K-1766 test kits, Mannitol test for borates

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    Re: First SLAM (woohoo!)

    Quote Originally Posted by JoyfulNoise View Post
    Yup. Distilled water has a pH close to 7 and nearly zero TA. When you dilute your high alkalinity pool water with it, it cuts the FC in half but doesn't change the pH because your pool water's alkalinity absorbs the excess hydrogen ions from the distilled water...in other words, your water's TA buffers against a pH change. This way, you can get a more accurate read of you pH at high FC.

    So, basically your pH is above 8.2 but that could be temporary from all of the bleach you've been adding. You can keep trying to bring it down or wait until the SLAM is over. Your choice.
    Thatls a cool trick. I'll wait for the SLAM to be over to avoid the risk of making an acid bath. I don't think it'll be a long SLAM though!
    Helpful Links: Pool Chemistry 101 - Recommended Levels - Recommended Chemicals - FC/CYA Chart - SLAM Instructions - Pool Math
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  17. Back To Top    #17
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    Re: First SLAM (woohoo!)

    Ending the night at 23FC. Looking forward to see what it reads in the AM.
    Helpful Links: Pool Chemistry 101 - Recommended Levels - Recommended Chemicals - FC/CYA Chart - SLAM Instructions - Pool Math
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  18. Back To Top    #18
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    Re: First SLAM (woohoo!)

    Looking completely clear this morning (compare the visibility of the main drains from my last pic). I was in a rush because I overslept so I don't know how accurate my counting was, but I think the FC drop was 1 or less. I forget to test CC in my haste. I'm going to push the SLAM one more night to be sure

    Helpful Links: Pool Chemistry 101 - Recommended Levels - Recommended Chemicals - FC/CYA Chart - SLAM Instructions - Pool Math
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  19. Back To Top    #19
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    Re: First SLAM (woohoo!)

    That's starting to look very nice. Make sure you pass the 3 SLAM criteria and you'll have this behind you in no time at all.
    Pat (a.k.a. Texas Splash) ~ My Pool: Viking Fiberglass; 17,888 Gal; Waterway Supreme 2-sp/2-hp pump; Hayward Ctg filter; TF-100 w/ Speed Stir
    Vital Links: POOL SCHOOL, RECOMMENDED LEVELS, RECOMMENDED CHEMICALS, Poolmath Calculator, SLAM, Chlorine/CYA CHART.
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  20. Back To Top    #20
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    Re: First SLAM (woohoo!)

    Quote Originally Posted by Texas Splash View Post
    That's starting to look very nice. Make sure you pass the 3 SLAM criteria and you'll have this behind you in no time at all.
    Got it

    I'll make sure to get my rear out of bed earlier so I can get a solid test in tomorrow AM.

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