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Thread: SWG settings in autumn / winter

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    Join Date
    Jan 2014
    Location
    Perth, Australia
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    31

    SWG settings in autumn / winter

    Hello all,

    So the weather is changing here downunder we're heading towards winter. The days are cooler, less sun, and the pool hardly get used.

    During summer, I used to run the SWG for 7 hours at 50% and that resulted with FC of 4.5 ppm.

    I have reduced SWG runtime to 6 hours (which means 1.9 ppm of FC generated daily) and my FC keeps rising by the day. I didn't complete the test but I've managed to reach 11 ppm and the solution colour was still strong (using the Taylor kit).

    Does it make sense that I will need to drop my SWG run time to say 4 or even 3 hours during winter? Or alternatively, keep it at 6 hours but lower production at say 25%? This will make only 1 ppm of FC daily, should I aim for less or more? I guess that depends on FC consumption but how can I predict that considering the pool has very limited use?

    Thanks!
    IG Fiberglass Pool - Sep/2013
    Pool capacity: 27,700 liter / 7,317 gallons
    Emaux V Series Sand Filters - Model: V700B; Size: 28"; Flow Rate: 89 gal/min
    Viron eVo P320 Pump; Flow rate (low/med/high): 32 gal/min, 56 gal/min, 66 gal/min
    Viron V18 pH Salt Chlorinator + RolaChem RP9 Automatic pH Controller

  2. Back To Top    #2

    Join Date
    Jun 2011
    Location
    Long Beach, CA
    Posts
    2,670

    Re: SWG settings in autumn / winter

    You will need to reduce the SWG's output and it is up to you on how to do it. Both ways work fine, reducing % and/or reducing the pump run time. If you want to save some $ on your electric bill, reduce the pump run time. Each pool is different, but during the winter I run mine for 4 hours,mostly on low-speed, and have to reduce the % to 20-25% and the pool stays clean and chlorinated. You will need to experiment on what is best for your pool, just keep an eye on the FC and adjust accordingly.
    16k gal plaster with raised spa, Jandy DEV60 filter, 2 HP 2-speed SHPF Jandy Stealth pump
    Hayward Aqua Rite T-15 SWCG, Jandy LXi 400k BTU NG heater, 350 sq.ft. of Sun Star solar panels, TF-100 Test Kit, Dolphin s300i Cleaner
    Test Kits . Pool Math . Chlorine/CYA Chart . The SLAM Process

  3. Back To Top    #3
    JasonLion's Avatar
    Join Date
    May 2007
    Location
    Silver Spring, MD
    Posts
    37,879

    Re: SWG settings in autumn / winter

    Generally you need more pump run time and more chlorine when the water is warmer, and not so much when the water is colder.
    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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    ComputerGuyInNOLA's Avatar
    Join Date
    Oct 2012
    Location
    Mandeville, Louisiana
    Posts
    602

    Re: SWG settings in autumn / winter

    During this past winter I went from 8 hours a day at 60% output to 3 hours at 10% output.
    Gunite/Plaster pool at 13k gallons. All Jandy with CL340 series cartridge filter, 1.5 HP Jandy Stealth pump. Jandy 1400 SWCG and PDA4 controller. Dual waterfalls. Polaris 280. Pool installed August 2012. Southern Louisiana. And lets not forget my trusty TF100 test kit!

  5. Back To Top    #5

    Re: SWG settings in autumn / winter

    Here on the other side of the Earth, my chlorine demand has been rising fast this last week. The days are getting rapidly longer, the sun is coming higher over the trees and the trees are dropping lots of stuff in the pool. I'm still below peak summer levels, but getting close fast.
    20,000 gal in-ground plaster pool with sand filter. Replastered recently. Mostly adding bleach and acid. CYA was high when I took over.

  6. Back To Top    #6

    Join Date
    Jan 2014
    Location
    Perth, Australia
    Posts
    31

    Re: SWG settings in autumn / winter

    Quote Originally Posted by JasonLion View Post
    and not so much when the water is colder.
    Thanks all. So just to clarify, the amount of chlorine I should be targeting is driven by water temperature and not air/outside temperature? Because some days are still warm, but the water is colder than before (I would say now it's ~26C/79F).
    IG Fiberglass Pool - Sep/2013
    Pool capacity: 27,700 liter / 7,317 gallons
    Emaux V Series Sand Filters - Model: V700B; Size: 28"; Flow Rate: 89 gal/min
    Viron eVo P320 Pump; Flow rate (low/med/high): 32 gal/min, 56 gal/min, 66 gal/min
    Viron V18 pH Salt Chlorinator + RolaChem RP9 Automatic pH Controller

  7. Back To Top    #7
    JasonLion's Avatar
    Join Date
    May 2007
    Location
    Silver Spring, MD
    Posts
    37,879

    Re: SWG settings in autumn / winter

    Right, water temperature is the largest factor, followed by number of people swimming (which is probably nobody right now).

    Just to be through, the FC level you are trying to maintain is the same as always. It is the amount of chlorine required to maintain that level that goes down.
    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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