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Thread: How cold is too cold to super chlorinate SWG

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    How cold is too cold to super chlorinate SWG

    The reading I have been doing suggests that it is hard on a SWG to run it when the water is cold. I am having difficulty finding something that actually says how cold is too cold. Currently our water temp is 60 degrees. Our water is cloudy and I am wanting to hold off on shocking until I can actually run the SWG at super chlorinate level. My plan is to do the shock process (shock, wait 2 hours, test, repeat) once I can get the SWG running at full speed.

    Currently I am limiting to 50% on the SWG due to cold water.

    Just to follow rules my pool stats are:

    TA - 140 ( too high )
    PH - 7.6
    CYA - 35 ( too low )
    FC - .2
    TC - 4
    salt - 3400

    I added CYA and Muratic today and am aerating. I expect my numbers to be at goal sometime this weekend.
    Jim -Nebraska
    12,000 Gallon, Vinyl In Ground
    Filter Flow Rate 120GPM, 3/4 HP pump
    Pool Built 1973

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    Richard320's Avatar
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    Re: How cold is too cold to super chlorinate SWG

    Quote Originally Posted by watermonster
    The reading I have been doing suggests that it is hard on a SWG to run it when the water is cold. I am having difficulty finding something that actually says how cold is too cold. Currently our water temp is 60 degrees. Our water is cloudy and I am wanting to hold off on shocking until I can actually run the SWG at super chlorinate level. My plan is to do the shock process (shock, wait 2 hours, test, repeat) once I can get the SWG running at full speed.

    Currently I am limiting to 50% on the SWG due to cold water.

    Just to follow rules my pool stats are:

    TA - 140 ( too high )
    PH - 7.6
    CYA - 35 ( too low )
    FC - .2
    TC - 4
    salt - 3400

    I added CYA and Muratic today and am aerating. I expect my numbers to be at goal sometime this weekend.
    If the CYA is hanging in a sock, pull it out. 35 is plenty high for the shock process. When you're done you can hang it again. The SWG probably won't be able to keep up with the demand; you'll need some liquid bleach

    Have you studied pool-school/shocking_your_pool ? Do you have the proper test kit ready to go?
    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!

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    Re: How cold is too cold to super chlorinate SWG

    Hi Richard - Unfortunately I added the CYA to the skimmer and suspect it is hanging out in my sand filter at the moment.

    I have read the shock process. My hope is that once I kill all the bad stuff my SWG will be able to keep up. I don't want to damage the SWG by trying to run it too high but I also don't want to be adding chlorine manually once I get the shock done. I will be using liquid chlorine 15% for the shock process.
    Jim -Nebraska
    12,000 Gallon, Vinyl In Ground
    Filter Flow Rate 120GPM, 3/4 HP pump
    Pool Built 1973

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    4knights's Avatar
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    Re: How cold is too cold to super chlorinate SWG

    I just finished a 24 hour super chlorinate and my water temp began at 61 it's 66 now (now heater or solar) I did add 1 bottle of pool shock since it was lying around. (current FC is off the scale- bright orange, PH 7.8)
    My manual didn't say anything about water temp other than when the cell would stop working temps.
    Ron- Kansas. IG fiberglass, Riviera 30 Freeform 13600 gallons,
    EasyTouch 4 w/IC20 SWCG, Pentair Whisperflo 1hp, 2 speed 220 pump, Hayward ProGrid 4820 DE filter using Eco Klean instead of DE, 2 Savi Melody 12v 5 color LEDs, Raypack 266k btu millivolt heater, Arctic Armour Mesh custom safety cover (Total self Install) TF-100 test kit w/Magic stir.

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    Re: How cold is too cold to super chlorinate SWG

    I will be using liquid chlorine 15% for the shock process.
    I am wanting to hold off on shocking until I can actually run the SWG at super chlorinate level. My plan is to do the shock process (shock, wait 2 hours, test, repeat) once I can get the SWG running at full speed.
    These two quotes seem to conflict a bit so let's clarify.....

    Your shock process will be more effective and easier to do if you simply shut off the SWG during shocking. SWG's don't produce a lot of chlorine very fast which is what you want when you shock. Use bleach or liquid chlorine.

    Take your SWG out of the equation during shocking and, when your pool is clear and the process is complete, let your FC drift back down to normal levels and turn on the SWG.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Re: How cold is too cold to super chlorinate SWG

    @duraleigh I am not sure why I would turn off the SWG while shocking. I agree that superchlor at the same time would be overkill. I am expecting that by having the SWG running I will be able to not spend as much time shocking.
    Jim -Nebraska
    12,000 Gallon, Vinyl In Ground
    Filter Flow Rate 120GPM, 3/4 HP pump
    Pool Built 1973

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    Re: How cold is too cold to super chlorinate SWG

    Quote Originally Posted by watermonster
    @duraleigh I am not sure why I would turn off the SWG while shocking. I agree that superchlor at the same time would be overkill. I am expecting that by having the SWG running I will be able to not spend as much time shocking.
    1. You cannot effectively measure your chlorine loss (important because the SWG is constantly adding chlorine at a rate you are not sure of).

    2. You cannot perform the OCLT with the SWG running and that's the determinate test for ending the process

    3. You are accelerating the consumption of your salt cell.....bleach is A LOT cheaper.

    4. Adding chlorine manually in the correct dose is far quicker and more effective than asking your SWG to do it.

    Can you get by doing it the way you plan? Almost surely. But you will add extra expense in the long run and you will lose the precision that we teach.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Re: How cold is too cold to super chlorinate SWG

    Excellent. Good reasons well said. Much appreciated.
    Jim -Nebraska
    12,000 Gallon, Vinyl In Ground
    Filter Flow Rate 120GPM, 3/4 HP pump
    Pool Built 1973

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