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Thread: Houston, do we have a problem?

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    wellsnlisa's Avatar
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    Houston, do we have a problem?

    I am trying to decide if something is starting to grow or if it just the Houston sun and heat which are beginning to get intense. Here are my numbers:

    Last night at 8:30 pm 1 hour after dosing the pool but not dark yet:

    FC 8
    CC 0
    Ph 7.4
    TA 90
    CH 270
    CYA 55
    BORATES 60

    This morning at 8:00 am (too lazy to get up before sunrise for a true OCLT):

    FC 7.4
    CC 0

    This evening at 7:00 pm:

    FC 5.0
    CC 0

    I am trying to decide if a 3 ppm loss just means I need to raise my CYA a bit or if it's "Houston, we have a problem".
    19,000 gal aqua blue pebble sheen, 3.5-7 ft. depth, chiseled flagstone coping, spillover spa, raised back wall with stacked stone face including two columns and curved wall water feature with three 18" sheer descents, two bubblers on 5' x 10' suntanning shelf, Pentair IntelliFlo Variable Speed, Pentair FNS Plus 60 sq ft DE filter, Pentair Mastertemp 400K BTU, Pentair Legend, Rainbow 320 chlorinator (now unused), K-2006 test kit.

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    Re: Houston, do we have a problem?

    The OCLT really requires you to test at night then again before the sun hits. Is your water clear, or do you otherwise sense there's an issue? A lot of us here can tell when something's wrong just by looking or smelling the water. After a while you just kind of instinctively know when there's something wrong.
    Built in 1957 44,000 gallon in-ground, Wet Edge Primera Stone in Sky Blue, Intelliflo VF Pump, 600 lb. Pentair Triton II TR-100 Sand Filter, CircuPool RG 60 Plus SWG, TF-100 test kit
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    wellsnlisa's Avatar
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    Re: Houston, do we have a problem?

    I was thinking a .6 ppm loss overnight wasn't too bad especially as I had tested an hour before sundown and again a couple of hours after sunup. Should I do it again the proper way? I am just concerned with needing to add nearly 3 quarts a day.

    Water is sparkly and beautiful.
    19,000 gal aqua blue pebble sheen, 3.5-7 ft. depth, chiseled flagstone coping, spillover spa, raised back wall with stacked stone face including two columns and curved wall water feature with three 18" sheer descents, two bubblers on 5' x 10' suntanning shelf, Pentair IntelliFlo Variable Speed, Pentair FNS Plus 60 sq ft DE filter, Pentair Mastertemp 400K BTU, Pentair Legend, Rainbow 320 chlorinator (now unused), K-2006 test kit.

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    Re: Houston, do we have a problem?

    Loss of .8 is probably just fine. Relax and enjoy!
    Built in 1957 44,000 gallon in-ground, Wet Edge Primera Stone in Sky Blue, Intelliflo VF Pump, 600 lb. Pentair Triton II TR-100 Sand Filter, CircuPool RG 60 Plus SWG, TF-100 test kit
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    wellsnlisa's Avatar
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    Re: Houston, do we have a problem?

    I will test after dark tonight and set the alarm for before sunup and try it again. Do I need to run the pump all night for the OCLT?
    19,000 gal aqua blue pebble sheen, 3.5-7 ft. depth, chiseled flagstone coping, spillover spa, raised back wall with stacked stone face including two columns and curved wall water feature with three 18" sheer descents, two bubblers on 5' x 10' suntanning shelf, Pentair IntelliFlo Variable Speed, Pentair FNS Plus 60 sq ft DE filter, Pentair Mastertemp 400K BTU, Pentair Legend, Rainbow 320 chlorinator (now unused), K-2006 test kit.

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    wellsnlisa's Avatar
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    Re: Houston, do we have a problem?

    Since my overnight loss is good, and there is probably nothing growing, do you think raising my CYA to 60 or 65 may help lower my daily CL consumption? I know I would have to raise my target to 8 ppm but I have been doing that anyway because of the 3 ppm daily loss. I was thinking raising the CYA by about 10 may lower the consumption.
    19,000 gal aqua blue pebble sheen, 3.5-7 ft. depth, chiseled flagstone coping, spillover spa, raised back wall with stacked stone face including two columns and curved wall water feature with three 18" sheer descents, two bubblers on 5' x 10' suntanning shelf, Pentair IntelliFlo Variable Speed, Pentair FNS Plus 60 sq ft DE filter, Pentair Mastertemp 400K BTU, Pentair Legend, Rainbow 320 chlorinator (now unused), K-2006 test kit.

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    BoDarville's Avatar
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    Re: Houston, do we have a problem?

    Quote Originally Posted by wellsnlisa
    Do I need to run the pump all night for the OCLT?
    Since you have a VS pump you could run it at a low speed all night with little impact to your electric bill. However, it is not necessary to do so as far as the OCLT is concerned. Just be sure to run it for about a half hour or so after adding chlorine to make sure it gets thoroughly mixed. If you leave the pump off overnight, I would suggest running it for at least 15 minutes (30 min would be even better) before you perform the morning chlorine test.

    Quote Originally Posted by wellsnlisa
    Since my overnight loss is good, and there is probably nothing growing, do you think raising my CYA to 60 or 65 may help lower my daily CL consumption?
    Raising the CYA will lower daily consumption, but I would hold off on that until you run your current OCLT and definitely rule out that nothing is growing. Losing 3 ppm / day at a CYA of 55 ppm seems a bit high for a clean pool. I lose less than that running at 35 ppm CYA and my pool is in full sun virtually all day.

    One other thing...What is the temperature of your pool water? Mine's currently at 85F. If your pool water is warmer than that, it could explain part of the reason why your FC consumption is 3 ppm/day. The warmest my pool has ever been since I've owned the house is 92F. Even at that temperature, the most FC I lost in a day was 2.5 ppm at a CYA of between 35-40 ppm. But, as we say, every pool is different.
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    wellsnlisa's Avatar
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    Re: Houston, do we have a problem?

    My pool temp reads 92 this morning, it was 94 last night. As of 10:30 last night FC was 7.2, at 6:20 this morning before sunrise it was 7.0. I thought I had dosed it to reach 8 earlier in the evening. That may be part of the problem. I think my 10% chlorine from the Ace Memorial Day sale may no longer be full strength. I am going to pick up some 8.25% from costco and see if I have the same problem. My loss may not be quite as high as I thought. Adding 3 quarts last night only raised my FC from 5 to 7.2.
    19,000 gal aqua blue pebble sheen, 3.5-7 ft. depth, chiseled flagstone coping, spillover spa, raised back wall with stacked stone face including two columns and curved wall water feature with three 18" sheer descents, two bubblers on 5' x 10' suntanning shelf, Pentair IntelliFlo Variable Speed, Pentair FNS Plus 60 sq ft DE filter, Pentair Mastertemp 400K BTU, Pentair Legend, Rainbow 320 chlorinator (now unused), K-2006 test kit.

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    Mod Squad zea3's Avatar
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    Re: Houston, do we have a problem?

    It sounds like your pool is just fine. You may want to try running a fountain to cool the water. It may not change your chlorine consumption but at least your pool won't feel like a bathtub!
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    BoDarville's Avatar
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    Re: Houston, do we have a problem?

    Getting the 8.25% bleach from Costco is a good idea since they have a high product turnover thus ensuring fresh product. I would suggest to anyone reading this that purchasing fresh bleach (preferably kept inside the store's climate-controlled area as opposed to outside such as in a lawn & garden area) is much more important than focusing on bleach strength. Given the choice between fresh 8.25% bleach vs. 10 or 12% bleach that is old, I would take the fresh 8.25% every time. I learned this lesson when I first joined TFP...Bought 10% that actually had the strength of 6% because it apparently sat on the shelf for quite some time in the lawn & garden area. Wasn't the bargain it appeared to be.
    Gold Supporter, TFP Lifetime Supporter, 26,680 gal Plaster IGP 3.5 - 10' depth / Attached Waterfall Spa, Manually Chlorinated, Triton Sand Filter, 1.5 HP * 1.1 SF = 1.65 SFHP 1-speed Pentair WhisperFlo WF-26 Pump, 400K BTU NG Teledyne Laars Series One Heater, Polaris 360, Test Kit Comparison, Chlorine/CYA Chart, SLAMing Your Pool, OCLT
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    wellsnlisa's Avatar
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    Re: Houston, do we have a problem?

    **UPDATE** Decided to better to be safe than sorry and used up all the suspect liquid chlorine from Ace to do an overnight SLAM. Raised it to 22 ppm and even after pouring in 3 gallons of the Ace stuff still needed a few cups of my brand new Clorox from Costco. Next morning at 6:30 am it had dropped to 19 ppm, so I think I did have the beginning of something. I raised it to 22 again in the morning and then let it drift down over the next couple of days. Last night at 8:30 pm it was at 8 ppm and at 6:30 am still at 8. Tested at 7:00 pm tonight and it was at 6 ppm so only a loss of 2 during the day. I have now gone from needing 3 quarts a day to less than 2.
    19,000 gal aqua blue pebble sheen, 3.5-7 ft. depth, chiseled flagstone coping, spillover spa, raised back wall with stacked stone face including two columns and curved wall water feature with three 18" sheer descents, two bubblers on 5' x 10' suntanning shelf, Pentair IntelliFlo Variable Speed, Pentair FNS Plus 60 sq ft DE filter, Pentair Mastertemp 400K BTU, Pentair Legend, Rainbow 320 chlorinator (now unused), K-2006 test kit.

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    Divin Dave's Avatar
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    Re: Houston, do we have a problem?

    Sounds like you're doing fine. If it were mine, I would go swimming and enjoy the thing a bit!

    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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