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Thread: Turning off SWG during the winter and Our FC levels

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    Join Date
    Apr 2008
    Location
    Texas
    Posts
    32

    Turning off SWG during the winter and Our FC levels

    Our pool is 6 months old and we leave in North Texas where we were advised by everybody to keep our pool running during the winter. We have a freeze-guard system that kicks on whenever the temperature falls below 38 degrees. It's been working well but today when I checked the chemical balance in the water I realized that FC = 9.5 / PH = 7.5

    My SWG is set for 10% for several weeks now. Last time I boosted the equipment was 4 weeks ago when we found a small mouse floating on the pool.

    My questions are two:
    1) Should I turn the SWG off or should I leave it on at 5% or even 0%?
    2) How do I get the FC level down during the winter? Do I have to worry about that?

    PS: The temperature here have ranged from 23-70 in the past few days.

    Data:
    FC: 9.5
    CC: 0.0
    Ph: 7.7
    Size: 15,500 galons
    Salt Level: 2,900 ppm
    Temperature in water: 38 degrees
    IG, 15,500 Gallons, DE 60 Filter, Pebble (RiverRock)

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    JasonLion's Avatar
    Join Date
    May 2007
    Location
    Silver Spring, MD
    Posts
    37,879

    Re: Turning off SWG during the winter and Our FC levels

    When your water is really cold, below 50 degrees, you can turn the SWG way down. I suggest trying it at 1%. Chlorine lasts longer in cold water and with cold water you don't need as much chlorine in the first place.

    The other option is to turn the SWG off completely and add a little chlorine manually. When the water is really cold you can add chlorine only occasionally, once ever week or two is usually plenty. Even once a month is often fine as long as the water stays cold. Air temperature is not all that important, as long as the water stays cold.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

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    Join Date
    Apr 2008
    Location
    Texas
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    32

    Re: Turning off SWG during the winter and Our FC levels

    Jasonlion,
    Thanks for the clarification. But with such a high FC, should I be concerned? Do I need to lower it in some other form or just lower the SWG to 1%?

    Regards,
    IG, 15,500 Gallons, DE 60 Filter, Pebble (RiverRock)

  4. Back To Top    #4
    Rockcrawler's Avatar
    Join Date
    May 2007
    Location
    El Paso, Texas
    Posts
    174

    Re: Turning off SWG during the winter and Our FC levels

    Because your FC is already at 9ppm, and your night time temps are kicking on pump/SWG I would go ahead and lower your SWG to 1%, mine already is at 1% because my water temp is at 45, or you could always wait until your water temps drop and then the Autopilot would adjust itself. Your clorine will lower over the coming months, just as Jason said when the water gets warmer. IMO 9 ppm FC is not "harming" your pool



    Rob
    13,000 IG Plaster, 2hp whisperflo pump, 48 sq in pentair DE Filter, 1 skimmer, 2 eyeball outlets, 200 sq ft solar panels on second story, Auto Pilot SWG-36, Polaris ATV Cleaner

  5. Back To Top    #5
    fofa's Avatar
    Join Date
    Sep 2008
    Location
    Houston, TX
    Posts
    75

    Re: Turning off SWG during the winter and Our FC levels

    Now I am not saying I am right, but I shut mine off, and run a floater with Trichlor tabs in it once the water temp reaches 60 F.
    I usually turn it back on when it reaches 65 F.

    But that is just me.
    30,000 Gallons, Hayward C5030 cartridge filter, IG, Plaster, SWG

  6. Back To Top    #6
    TroyB's Avatar
    Join Date
    Oct 2008
    Location
    Houston, TX
    Posts
    39

    Re: Turning off SWG during the winter and Our FC levels

    My water is at 57 degrees and we are expecting cold weather for the next week or so. I turned my SWG off and am using bleach. I found a real deal at Sam's Club, 3 - 182 oz. jugs of 6% bleach for $7 & change!
    - 25K Gallons, Jandy AquaPure Model Pure1400 SWG w/ AquaLink RS PDA, Jandy LXi Heater Model 400
    - Jandy CV460 Cartridge Filters
    - IG Plaster Pool w/ rock waterfall & weeping walls, Elevated spill-over spa
    - 2 X Jandy Stealth SHPM2.5 pumps (one for pool, one for waterfall), Pool Pump ~ 100 GPM in pool mode
    - UltraPure UPP25 Ozone Generator, Polaris 280 w/ Polaris Halcyon booster pump

  7. Back To Top    #7
    Tonedeaf's Avatar
    Join Date
    Jun 2008
    Location
    East of Dallas
    Posts
    104

    Re: Turning off SWG during the winter and Our FC levels

    We were only able to use our SWG for about 2-3 weeks before the cold starting coming into the Dallas area. Wasn't able to figure out what the correct % was on it anyway so I let the FC levels get into the double digits, was in the mid teens for a bit there. The chlorine levels have now come back down to 5-6 and I will hold it with chlorine pucks. I had read that the SWG doesn't work under 45-50 anyway. So, it is off and will stay off until we start getting some warmer weather. Testing every week just to be sure. Only thing I have had to add is acid to lower pH.
    14100 gallon IG Gunite Pool
    Sapphire Smoke Quartz Plaster
    Pentair SunTouch Controller, Intelliflo 4x160 Pump, 520 Cartridge Filter, Intellichlor SWG System
    Legend Platinum Cleaner with booster pump
    My Pool Build

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