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Thread: Day vs Night

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    Day vs Night

    I read somewhere on the forum that it's better to run the filter during sunlight hours for a SWG. I was under the impression that it's generally better to run it at night - sunlight doesnt break down the FC and you can achieve sanitation in fewer hours of pump operation.

    Which do you prefer and why?
    28,00 gallons IG. Vinyl. DE. Pool built in 2010. SWG installed 2014.

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    Mod Squad woodyp's Avatar
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    Re: Day vs Night

    You need to be putting it (FC) in there while it is largely being consumed. Or you can break up your run times with a timer.
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    Mod Squad jblizzle's Avatar
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    Re: Day vs Night

    It makes very little difference. Day preferred, but night is fine if power is cheaper.
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
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    Re: Day vs Night

    But why is day preferred?
    28,00 gallons IG. Vinyl. DE. Pool built in 2010. SWG installed 2014.

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    elwood58's Avatar
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    Re: Day vs Night

    Day is usually preferred as you are generating additional chlorine when chlorine consumption is at its peak. SWG pools use a lower ppm of chlorine and a higher CYA. If you ever get behind on chlorine production, and an algae problem develops, it takes a bunch of chlorine to get to shock level and clear the algae. As mentioned, you can also split runtime between dark and sunlight hours. My folks run their SWG pool from the wee hours until just before noon, which is when the rates go up. They have their SWG set so that when they measure chlorine at sunset, they never drop below the minimum recommended level.

    We tend to run during the day, especially when using the HeatPump to warm the pool. When we get to the point where we need to run the HeatPump in chiller mode, we will start the pump in the wee hours to take advantage of cooler temps for chilling.
    19204 Gallon L Shape with a 10X10 2nd Step Baja Ledge. Intellichlor IC-40, IntellipH, Cartridge Filter, Pentair Heater/Chiller (Heat Pump). Tons of Deck with Deck Jets. Construction Complete 6/5/17.

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    Mod Squad jblizzle's Avatar
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    Re: Day vs Night

    With the sun on the pool and no circulation, you could get localized places where the FC drops too low. And as Elwood stated, with a SWG, adding the FC during the day beneficial.

    Again, day is only slight more desirable, certainly not required.
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
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