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Thread: OCLT minor question

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    OCLT minor question

    I plan to perform the test tonight to verify the pool is in good shape

    How much will the OCLT be affected by windy conditions, and any minor debris in the skimmers/vacuum bag?

    Should the pump be left running, or shut off?

    Wind is a fact of life here, and we have lots of trees etc in the neighborhood willing to help pollinate the pool
    33k Gunite, CompuPool CPSC48 SWG, Sta-Rite System 3 DE, 2.25hp dual-speed, POOLVERGNUEGEN Pressure-side

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    Mod Squad Bama Rambler's Avatar
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    Re: OCLT minor question

    Not much. Part of the reason the requirement is 1ppm or less loss is to account for stuff like that. Ideally in a perfect world you'd have zero loss but we don't live there yet.
    Dave J. TFP Moderator
    24' x 52" Round AGP. 2hp/¼hp SPL Power-Flo 2-speed pump. 200sqft Waterway Cartridge Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
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    JasonLion's Avatar
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    Re: OCLT minor question

    You want the pump running for at least half an hour before testing. Also, you are also often doing the OCLT while shocking, which calls for having the pump on. However, the test its self does not require that the pump be running overnight.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
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    Re: OCLT minor question

    I'm doing the test to verify if I have sneaky algae in the pool or not
    Pool has always been crystal clear, but FC decreases faster than it should according to the math. Cell is undersized but I have it running enough hours it should easily maintain 4-5ppm. Instead, it drops 1ppm or so per day, down to close to zero - at which point I bump it back up to 5 with bleach.

    Chemistry:
    pH 7.8
    TA 80
    Ch 400
    salt 3800
    FC target 5, drops to 1, dose back up...
    CC 0
    CYA 75
    Borates 50
    Temp 73F

    We're in the pool every day... Anything I might be missing?

    SWCG should be able to maintain level with around 6 hrs runtime. It's running 12hrs a day and not keeping up. Cell is operating, it generates a ton of Cl in the bucket test.
    33k Gunite, CompuPool CPSC48 SWG, Sta-Rite System 3 DE, 2.25hp dual-speed, POOLVERGNUEGEN Pressure-side

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    JasonLion's Avatar
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    Re: OCLT minor question

    Your numbers look reasonable, CH and Salt are both a tiny bit high, but nothing to worry about and certainly not something that would cause the problem you describe. A low level algae problem is the most likely cause, and doing an OCLT is a great idea.
    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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    Re: OCLT minor question

    Thanks again -
    The SWCG specs 4k salt (older Polaris Clearwater system), and I deal with 120ppm Ch incoming water and lots of evaporation...
    Will share OCLT results tomorrow!
    33k Gunite, CompuPool CPSC48 SWG, Sta-Rite System 3 DE, 2.25hp dual-speed, POOLVERGNUEGEN Pressure-side

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    Re: OCLT minor question

    Started at 2.5ppm and fell to 2.0ppm overnight. yay!

    but it can't keep up with the need - it was at 5.0 2 days ago

    So it may be time to look @ larger unit.... running this thing 12hrs a day, and only keeping up with 1/2 the load, is not sustainable.
    33k Gunite, CompuPool CPSC48 SWG, Sta-Rite System 3 DE, 2.25hp dual-speed, POOLVERGNUEGEN Pressure-side

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    JasonLion's Avatar
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    Re: OCLT minor question

    Have you taken a look at the cell plates? If they have crusty white deposits that might account for the reduced chlorine production.
    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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    Re: OCLT minor question

    Cell plates are perfect - no buildup. I cleaned them when I first bought the house (1.5yrs ago) and kept the water in balance since then - no issues.

    I think it may just be load related. We have 4-6 people in the pool most every day for an hour or more. 4 of them kiddos and no guarantee there's not wee-ing in the pool
    33k Gunite, CompuPool CPSC48 SWG, Sta-Rite System 3 DE, 2.25hp dual-speed, POOLVERGNUEGEN Pressure-side

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    JasonLion's Avatar
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    Re: OCLT minor question

    Frequent swimming can dramatically increase the chlorine demand, so that makes sense.
    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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    Mod Squad Bama Rambler's Avatar
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    Re: OCLT minor question

    4 of them kiddos and no guarantee there's not wee-ing in the pool
    Oh yeah, a little ammonia will go a long way in sucking up some FC!
    Dave J. TFP Moderator
    24' x 52" Round AGP. 2hp/¼hp SPL Power-Flo 2-speed pump. 200sqft Waterway Cartridge Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
    Pool School ----- Pool Math ----- TF-Test Kit

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