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Thread: OCLT Question

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    OCLT Question

    Hi, I'm new to the forum and have a question about the OCLT test. Should the pump be running overnight to perform this test? I assume yes.
    17x30 freeform IG w/spa & spillover approx. 13,000g, exposed aggregate "Florida Pearl" finish; Hayward PS-4 automation w/T15 salt cell, SP3400 var. sp. pump & C1200 filter; Gulfstream 120,000 BTU HP; Pentair auto & manual valves. Built Jan 2013

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    Mod Squad tim5055's Avatar
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    Re: OCLT Question

    Pump on, SWCG off.

    Welcome to TFP!!
    TFP Moderator 39 X 18 23,000(ish) freeform gunite; built 2007ish; Pentair Triton II TR100 600lb Sand filter; 2 HP Pentair pump with 2.2 HP AO Smith single speed motor; 2 skimmers, 1 main drain, 4 returns w/waterfall, Stenner 45MHP2 3GPD running@ 60% - 15 gal Tank; heated by the sun CYA 200+ when I started - 50 now. Dolphin Supreme M5 Pool Cleaner. Hot Springs SX Spa, 285 gallon

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    swoopman's Avatar
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    Re: OCLT Question

    tim5055: Based on your response to this post I reread the OCLT directions on this page:
    http://www.troublefreepool.com/conte...loss-test-oclt

    It doesn't mention running the pump during the OCLT. I guess it is assumed that if you are SLAMming then you are running your pump. But if you're doing the OCLT to see if there is a problem or not you wouldn't necessarily be running the pump. Maybe one of the moderators could update that page to reflect that the pump should be running during an OCLT for us newbies who wouldn't know that.

    Thanks!
    TF-100 Test Kit
    22,000 gallon, 20x40 kidney-shape IG plaster pool built in 1986
    Nautilus NS-36 DE filter, Hayward Self Prime Super Pump 1HP
    Polaris Automatic Pool Cleaner, PB4-60 3/4 HP pump

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    funandsun's Avatar
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    Re: OCLT Question

    Ok, Pool is clear and I am entering the OCLT phase... my question is... what is the minimum amount of hours that would qualify? If my last test of the evening is 10pm and I test at 5am is this the same as someone who tests at 10pm and then retests at 8am?

    Or is the direct sunlight the qualifier, should lose no more than 1ppm between periods of no direct sunlight on the pool?

    Is there any noted variance between the temps of the water... spring cleaning vs summer where water may be 15-25 degrees difference?

    asking for a friend ~
    13k gal, IG Vinyl ( Spring 2004), Infinity 2000 Recessed/Top Track Pool Cover (Spring 2004), Pentair SuperFlo VS (Spring 2017), Hayward S180T Sand Filter (Spring 2014), Pentair R201276214 Pro Vac (Spring 2017), Taylor K-2006+SpeedStir (Spring 2017)
    2009 HotSpring Vanguard 400 gallon spa (Summer 2009)
    Rule #1: Chlorine kills Algae and your Filter cleans the water

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    Razorhog's Avatar
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    Re: OCLT Question

    Quote Originally Posted by funandsun View Post
    Ok, Pool is clear and I am entering the OCLT phase... my question is... what is the minimum amount of hours that would qualify? If my last test of the evening is 10pm and I test at 5am is this the same as someone who tests at 10pm and then retests at 8am?

    Or is the direct sunlight the qualifier, should lose no more than 1ppm between periods of no direct sunlight on the pool?

    Is there any noted variance between the temps of the water... spring cleaning vs summer where water may be 15-25 degrees difference?

    asking for a friend ~
    LOL tell your friend not to overthink it. Just test once the sun is down and again in the morning before there is direct sun on the pool. A 10 pm and 5 am sounds perfect. I just did one last night and tested at 8pm and 6:30am. Passed, woohooo
    SLAM * Chlorine/CYA Chart * Pool Math * Pool School
    17.5k gal IG Fiberglass, Triton II TR60 Sand Filter, Jacuzzi Magum Force Pump 1.5 hp, 3/4 hp booster, Polaris 280, TF-100 Test Kit with Speed Stir

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    funandsun's Avatar
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    Re: OCLT Question

    Thanks Razorhog

    I will uhmm, pass that along
    13k gal, IG Vinyl ( Spring 2004), Infinity 2000 Recessed/Top Track Pool Cover (Spring 2004), Pentair SuperFlo VS (Spring 2017), Hayward S180T Sand Filter (Spring 2014), Pentair R201276214 Pro Vac (Spring 2017), Taylor K-2006+SpeedStir (Spring 2017)
    2009 HotSpring Vanguard 400 gallon spa (Summer 2009)
    Rule #1: Chlorine kills Algae and your Filter cleans the water

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    Mod Squad tim5055's Avatar
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    Re: OCLT Question

    Quote Originally Posted by swoopman View Post
    tim5055: Based on your response to this post I reread the OCLT directions on this page:
    http://www.troublefreepool.com/conte...loss-test-oclt

    It doesn't mention running the pump during the OCLT. I guess it is assumed that if you are SLAMming then you are running your pump. But if you're doing the OCLT to see if there is a problem or not you wouldn't necessarily be running the pump. Maybe one of the moderators could update that page to reflect that the pump should be running during an OCLT for us newbies who wouldn't know that.

    Thanks!
    Sorry, I missed this question before. Yes, we are in the process of going over all of our support documentation to make sure the advise is consistant across all of it.

    Tell your friend that the idea is to have well mixed water. If you turn the pump off too soon after adding your last chlorine the the "start" water sample may not be an accurate representation of the bulk pool water FC level. Or, in the morning if you don't run the pump long enough before taking your "end" water sample the same thing may occur, you may have an area where there is algae hidden that is consuming the chlorine but if the water is not well mixed you may not see the drop in FC that would indicate it.
    TFP Moderator 39 X 18 23,000(ish) freeform gunite; built 2007ish; Pentair Triton II TR100 600lb Sand filter; 2 HP Pentair pump with 2.2 HP AO Smith single speed motor; 2 skimmers, 1 main drain, 4 returns w/waterfall, Stenner 45MHP2 3GPD running@ 60% - 15 gal Tank; heated by the sun CYA 200+ when I started - 50 now. Dolphin Supreme M5 Pool Cleaner. Hot Springs SX Spa, 285 gallon

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