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Thread: What time to start OCLT?

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    What time to start OCLT?

    Sunset here is at 8:52 today in my location. Can I start the OCLT at 8:53 as quick as the sun is below the horizon? Or does indirect sunlight affect it meaning I should start later? If later, how much later?
    30,000 gal IG 20x40 8ft deep end vinyl liner in NE Ohio DOB Sept 2012
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    Divin Dave's Avatar
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    Re: What time to start OCLT?

    I would say just to be on the safe side, right about the time it gets dark.
    Divin Dave,
    IG Vinyl, 15' x 30', 3 1/2' - 6' deep, Oval, ~15K gal, Intelliclor IC40, Intelliflo VS pump, Clean and Clear 420 Filter, auto-fill-disabled, Retrofit LED Color Light, Dolphin Nautilus Robot, TF100 Test Kit, Taylor K1766 Salt Test Kit, Tftestkit Pressure Gauge.
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    Re: What time to start OCLT?

    The are different definitions of "dark." Civil dusk is about 30 minutes after sunset in my area at this time of year, and the horizon and terrestrial objects are easily distinguished still. Nautical dusk is about 40 minutes after that, the horizon is barely visible and the general outlines of ground objects are still distinguishable. Astronomical dusk is still 50 minutes later, the horizon and ground objects are indistinguishable, and astronomical objects are fully visible. So if I want to wait until it is "fully dark," I have to wait until about 11:00 to start the OCLT. That is past my bed time LOL.

    How long after sunset do people usually wait?
    30,000 gal IG 20x40 8ft deep end vinyl liner in NE Ohio DOB Sept 2012
    Hayward 4820 DE filter, Hayward SP2610x15 1.5HP single speed pump
    Hayward H400FDN natural gas heater, Frog min'l/Cl2 system (not in use)
    autocover, Dolphin DX4 cleaner, well water, TF100 test kit

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    Casey's Avatar
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    Re: What time to start OCLT?

    When the Sun has beaten you to bed.
    I'd bet you my bikini you'll never get TFP water from a pool store!

    24' Sharkline Venture De Filter

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    Mod Squad pooldv's Avatar
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    Re: What time to start OCLT?

    I would test between 9:30 and 10:00
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    Re: What time to start OCLT?

    Bedtime, just to be sure. In my case that means some time between 9:30 and 11:00. Sun-up is also subjective. This time of year, I'd say about 4:45.
    Chris
    17' x 35' outdoor in-ground Grecian shaped w/ vinyl liner. ≈ 21,000 gallons. Hayward S-200 Sand Filter and 1 HP Hayward Super-pump. Other Accessories: slide, light, ladder, fiberglass stairs, TF-100. Baquacil Conversion - June 2015, SLAM How-to, Chlorine/CYA Chart

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