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Thread: Do I have a problem here?

  1. Back To Top    #1

    Join Date
    Sep 2007
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    Lafayette, Louisiana
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    Do I have a problem here?

    Hello folks!

    I have a good handle on the whole water chemistry thing, but seem to be having a problem maintaining a good 3-4 FC level in my pool lately. I have a Pool Pilot with a SC-60 cell. When I first opened the pool and activated the salt cell about 6 weeks later, I used to be able to maintain FC levels with the cell power set to 1 and the power around 75%. I can't to do that anymore. I've bumped the power from level I to level II to level III now and am running at 80%. I check the water every morning and end up with a FC of about 1 ppm. I've been supplementing after my morning testing with bleach to keep my FC up to 3-4. The water looks good and I do not believe I have any algae problems.

    I can see the tiny bubbles coming from the nearest return to the equipment pad, so I think the cell is making some kind of gas or could this be from something else? I don't have a leak in my system and my pump strainer lid has no bubbles floating in it and my filter housing is not collecting air.

    Do I have a problem with my salt cell?

    Here are my morning numbers, and these have been about the same over the last week or two. I went through the borate adding process over the last three days and everything went well and rebalanced out.

    pH: 7.6
    FC: 1
    CC: 0
    TA: 70
    CH: 350
    CYA: 70
    Borates: 40-50
    Salt: 3300
    Temp: ~91

    Am I missing something or do I possibly have a bum cell?

    Thanks...
    Fortune favors the well prepared

    The build...
    viewtopic.php?t=3974
    Freeform 24' x 38' IG gunite. 3 1/2' to 8' deep. 28,500 gallons. AutoPilot Total Control SWCG. Pentair Intelliflo VF. Pentair CCP520 cartridge filter. Colorlogic LED lights. Tahoe Blue Diamond Brite. 1200 sq ft stamped concrete deck.
    More details as they happen...

  2. Back To Top    #2
    frustratedpoolmom's Avatar
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    Re: Do I have a problem here?

    You need to turn off the SWG tonight, and do an overnight FC loss test. This will take sunlight out of the equasion, it will rule out organics as the issue - and pinpoint the cell, if the unit isn't functioning properly...

    If you lose more than 1ppm FC overnight with the SWG off, you have organics and the SWG can't keep up. This means you'll need to shock with liquid chlorine.

    Let us know what you find.
    Helpful links: Pool School; CYA/Chlorine Chart
    24' round AG pool, 52" high, Raypak heater; Waterway 2 spd Pump;
    150 Sq ft. Clearwater Cartridge Filter; Former and DISSATISFIED "Pool Frog" owner
    http://www.PerfectlyClearPoolService.com

  3. Back To Top    #3

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    Macon Ga
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    Re: Do I have a problem here?

    I had the same problem about two weeks ago. I had the SWG set to about 25% and had to keep turning it up about 10% everyday. My test kit did not show any CC (TFP100) but I did shock the pool and now the SWG is back holding the FC right at 4PPM at the 25% position. I took a sample to the PS and they did say I had .5 CC but I did not show it.
    18X38 Grecian 26000 gallon In Ground Vinyl. Goldline AuqaRite SWG with a 1.5 HP Pentair Pump. Triton 2 Sand Filter Two main drains with 4 main returns with 2 more returns on the swimout and two skimmers. Polaris 380

  4. Back To Top    #4
    mas985's Avatar
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    Re: Do I have a problem here?

    One thing to remember is that CC is the result of chlorine killing algae so even if you don't have any CC, you can still have algae. It may take a day or so of killing algae before CC shows up in any measureable amount.
    Mark
    Hydraulics 101; Pump Ed 101; Pump/Pool Spreadsheets; Pump Run Time Study; DIY Acid Dosing; DIY Cover Roller
    18'x36' 20k plaster, MaxFlo SP2303VSP, Aqualogic PS8 SWCG, 420 sq-ft Cartridge, Solar, 6 jet spa, 1 HP jet pump, 400k BTU NG Heater

  5. Back To Top    #5

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    Re: Do I have a problem here?

    I'll bring the pool up to shock level tonight and see how it goes in the morning, just to make sure I don't have any algae lingering around somewhere. I've shown a couple trace amounts of CC over the last week, but just barely enough to register on the test. I would say less than 0.5.

    Is it normal to see those tiny bubbles coming from the nearest pool return? That would be a good sign of the SWG working as far as I can tell.

    Thanks for the input.
    Fortune favors the well prepared

    The build...
    viewtopic.php?t=3974
    Freeform 24' x 38' IG gunite. 3 1/2' to 8' deep. 28,500 gallons. AutoPilot Total Control SWCG. Pentair Intelliflo VF. Pentair CCP520 cartridge filter. Colorlogic LED lights. Tahoe Blue Diamond Brite. 1200 sq ft stamped concrete deck.
    More details as they happen...

  6. Back To Top    #6

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    Re: Do I have a problem here?

    One more small thing...

    The water is very clear, but I am getting some small white dusty stuff down in the deep end that the Polaris robot won't even pick up. It just whisks it around and blows through the bag.

    Would that white dusty/flaky stuff be dead algae? Or some kind of calcium flakes? I generally keep my CSI just on the negative side, so I wouldn't expect Calcium deposits. Maybe I'm just keeping up with the algae so I'm keeping the water clear but not killing it all the way?

    Thanks...
    Fortune favors the well prepared

    The build...
    viewtopic.php?t=3974
    Freeform 24' x 38' IG gunite. 3 1/2' to 8' deep. 28,500 gallons. AutoPilot Total Control SWCG. Pentair Intelliflo VF. Pentair CCP520 cartridge filter. Colorlogic LED lights. Tahoe Blue Diamond Brite. 1200 sq ft stamped concrete deck.
    More details as they happen...

  7. Back To Top    #7

    Join Date
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    Lafayette, Louisiana
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    344

    Re: Do I have a problem here?

    OK, so I did the overnight FC loss test and I did lose some FC. I actually brought the FC up to 17 and waited half an hour to let the water circulate for a re-test so I wouldn't overshoot too far. I was expecting a similar number and actually lost 3 ppm (went down to 14) so I had to hit it again to get over 20. When I tested early this morning my FC was down around 12, so I've hit it with bleach again up to 21.

    Can you have this bad of a chlorine demand from algae and still have good clear water? What are the other possibilities?

    Thanks...
    Fortune favors the well prepared

    The build...
    viewtopic.php?t=3974
    Freeform 24' x 38' IG gunite. 3 1/2' to 8' deep. 28,500 gallons. AutoPilot Total Control SWCG. Pentair Intelliflo VF. Pentair CCP520 cartridge filter. Colorlogic LED lights. Tahoe Blue Diamond Brite. 1200 sq ft stamped concrete deck.
    More details as they happen...

  8. Back To Top    #8
    Ohm_Boy's Avatar
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    Orlando, FL
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    Re: Do I have a problem here?

    You can certainly have that sort of loss and still have clear water, especially with your SWG running. The problem is that algae is killing your chlorine. Now with your FC at shock level, the chlorine can begin winning the battle. Once all the algae is dead, you can let the FC drop back to normal and use the SWG to maintain it.
    [center:1kpalu48]Helpful Links: Pool School | CYA/Chlorine Chart | Pool Calculator[/center:1kpalu48]

  9. Back To Top    #9
    JasonLion's Avatar
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    Re: Do I have a problem here?

    You have an ammonia like contaminate, probably left over from the winter and still not cleared out yet. You need to keep shocking till you don't lose chlorine overnight.

    All SWGs produce bubbles when they are on. Often they are very difficult to see, and many people never notice them.
    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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