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Thread: First SLAM losing 14 ppm of Chlorine

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    Join Date
    Feb 2014
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    First SLAM losing 14 ppm of Chlorine

    I did a drain and fill and replaced all of the water. The water turned a light transparent green. I just added chlorine and did not SLAM. I wanted to get all the levels correct. I brought the CC from 2.5 to 0.5 and then adjusted my PH and CYA. After about a week I started to SLAM. Im shooting for 12ppm of FC min.

    SLAM day 1 @ 3pm (4/13) sunny day

    PH 7.6
    CYA ~ 37
    FC 5.5
    CC 0.5
    CH 130
    TA 120
    *added 3 gals on 8.25% bleach and 5 tablets


    SLAM day 1 @ 9pm
    FC 21
    *added 1 gal on 8.25 bleach so FC is maybe ~ 26

    SLAM day 2 @ 7am
    FC = 25.5 (0.5ppm loss but tablets added chlorine so loss of chlorine was greater than 0.5ppm)


    SLAM day 2 @ 8pm very cloudy
    FC = 18
    *added 2 gals on 8.25 bleach and removed tablets overnight for morning test


    SLAM day 2 @ 9pm without tablets
    FC = 26.5


    SLAM day 3 @ 7am sunny
    FC =25.5
    *only 1 ppm loss. I add the same tablets back in


    SLAM day 3 @ 7pm
    FC = 12!!! is this normal loss?

    Do I still need to keep SLAMing since I only reached a 1.0ppm chlorine loss and not 0.5? sorry for the long post
    Century B129, 3/4 HP, 1.5 SF,
    In-ground gunite 17,400 Gal, FNS plus 60 DE Filter

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    pwrstrk's Avatar
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    First SLAM losing 14 ppm of Chlorine

    First, why are you using pucks while SLAMING ? We don't recommend them for SLAMMING. Have you read the SLAM process in pool school ?
    I take it you were using a CYA level of 40 for SLAM FC level. Your FC level would be 16. An FC level of 26 is a little overkill. You'll lose more FC that way because the CYA level isn't high enough to protect the FC from burn off IMO.
    I suggest you not use the pucks while SLAMMING.
    What does your water look like ?
    Your done with the SLAM when
    Water is crystal clear
    You can pass the OCLT
    You have CC of 0.5 or less
    Jeff
    24'x54" AG Morada RTR (by wilbar) 13'500 gal. Hayward Powerflo Matrix 1hp 2 speed. Hayward Perflex EC65 DE filter.

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    Smykowski's Avatar
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    Re: First SLAM losing 14 ppm of Chlorine

    I noticed that you said "transparent green." That sounds like metals in the water. Have you tested the fill? What is your fill source?
    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
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    Mod Squad jblizzle's Avatar
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    Re: First SLAM losing 14 ppm of Chlorine

    On sunny day lost a lot more FC. That is normal. For a CYA around 40, it would not be unusual to lose more than 50% of the FC in a day which is why you are wasting money raising the FC so high.

    You passed the OCLT, if there is no algae and your CC are near 0, then you are done.
    Jason, TFP Moderator
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    Re: First SLAM losing 14 ppm of Chlorine

    I suggest you not use the pucks while SLAMMING.
    What does your water look like ?
    Your done with the SLAM when
    Water is crystal clear
    You can pass the OCLT
    You have CC of 0.5 or less
    I only am using pucks to slowly bring up the CYA to 40. I use liquid bleach.
    The reason I ask about continuing to SLAM is because my OCLT was a loss of 1.0ppm instead of the suggested 0.5 -----answered below



    I noticed that you said "transparent green." That sounds like metals in the water. Have you tested the fill? What is your fill source?
    The water was clear in the evening at first but was green in the morning before direct sunlight as the pool was half full. I used the good ole hose to get city water as my fill water. I think it turned green because I added no chlorine.



    On sunny day lost a lot more FC. That is normal. For a CYA around 40, it would not be unusual to lose more than 50% of the FC in a day which is why you are wasting money raising the FC so high.

    You passed the OCLT, if there is no algae and your CC are near 0, then you are done.
    Look like I might be bringing up my CYA. The higher the FC level the more it looses.... I only SLAM at a high level becuase I use to stay 5 ppm above the SLAM min to only find the FC went lower than the SLAM level when I get home. Im gone at least 12 hours a day
    Century B129, 3/4 HP, 1.5 SF,
    In-ground gunite 17,400 Gal, FNS plus 60 DE Filter

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    Mod Squad jblizzle's Avatar
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    Re: First SLAM losing 14 ppm of Chlorine

    The OCLT requires that you do not lose more than 1ppm.
    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
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