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Thread: Little to no chlorine consumption

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    Little to no chlorine consumption

    My water is pristine and perfect, almost sparkly. However I accientally put a little too much Chlorine in i the other day (about 4 days ago), and I can't seem to get my chlorine levels to drop.

    I had two trichlor pucks in he skimmer (per my PB's requirement for the 1st 2 weeks) and added a little too much bleach to the pool, raising my TC and FC to about 6.0 I now have no pucks in the skimmer for three days and the FC is at about 5.0. My CYA is at 35 according to the pool store.

    I have been having to add about a gallon of muratic acid every day to keep the PH down as the plaster is curing.

    I'll post a full set of test results from my TF100 tonight if I get the chance, but for now I was wondering:

    1. Does all the muratic acid I've been adding slow and/or eliminate the chlorine usage?

    2. Does my Spa spillover provie enough aeration to noticably raise the PH in addition to what the plaster curing is doing?

    3. Also I've been running the waterfall about 2 hours a day, is this providing a noticable PH rise?

    Thanks.

    Bryan
    18K Gallon In Ground Gunite Pool, Quartz/Plaster Finish, 8' Spa with Spillover, 1 Grotto/Waterfall, Hayward/Goldline PS8 controller, 1.5 HP Two Speed Pump, 1HP Booster Pump for Grotto/Waterfall, Cartridge Filter,400K BTU Nat Gas Heater, Ozonator,3 Multi-Color LED Lights (Spa, Grotto, Pool).

    Ozonator is not functioing, evaluating my options, either fix it or get a new one or drop it completely.

  2. Back To Top    #2
    frustratedpoolmom's Avatar
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    Re: Little to no chlorine consumption

    If only everyone had trouble losing FC....

    Do you have a solar cover on? Solar covers help prevent FC loss from sunlight.

    As for the PH rising, aeration causing PH rise is directly related to your TA, so what is your TA? A waterfall and spa are enough aeration to cause it to rise, especially if the TA is on the high side.

    The MA wouldn't affect the FC. In any event, at 35 CYA, a FC of 5-6 isn't "too high" and won't hurt anything.
    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

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    JasonLion's Avatar
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    Re: Little to no chlorine consumption

    With CYA at 35 and the pool exposed to sunlight, you should be losing 60+% of your FC each day. With a solar cover or an indoor pool the daily FC loss is far lower.
    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

  4. Back To Top    #4

    Re: Little to no chlorine consumption

    No Solar Cover, Not much "direct sunlight", shaded by the house most of the day, but it probably gets 3 to 4 good hours of sunlight a day. The TA is still over 200, so the areation could be contributing to my PH rise along with the Plaster curing.

    I've now been about 24 hours without any CHlorine pucks at all in the skimmer, I'll see what the chlorine level is like tonight and post a full set of test results.

    Can anyone tell me how much CYA the pucks add?

    Thanks,

    Bryan
    18K Gallon In Ground Gunite Pool, Quartz/Plaster Finish, 8' Spa with Spillover, 1 Grotto/Waterfall, Hayward/Goldline PS8 controller, 1.5 HP Two Speed Pump, 1HP Booster Pump for Grotto/Waterfall, Cartridge Filter,400K BTU Nat Gas Heater, Ozonator,3 Multi-Color LED Lights (Spa, Grotto, Pool).

    Ozonator is not functioing, evaluating my options, either fix it or get a new one or drop it completely.

  5. Back To Top    #5
    JasonLion's Avatar
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    Re: Little to no chlorine consumption

    A 7 oz trichlor tablet/puck would add 2 ppm of CYA in 18,000 gallons. Trichlor tablets come in various sizes, 6 oz, 7 oz, and 8 oz are all fairly common.
    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

  6. Back To Top    #6
    frustratedpoolmom's Avatar
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    Re: Little to no chlorine consumption

    I just noticed your signature...

    I wouldn't try running with a FC of 1ppm if your CYA is already 35. At the minimum, you should run with 2ppm. See the chart in my signature, for the recommended FC level.
    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

  7. Back To Top    #7

    Re: Little to no chlorine consumption

    From what I am seeing, I already need to stop using the trichlor pucks as my CYA is high enough. Its amazing how different pool stores give you different results when it comes to water tests. Here are my numbers per pool store #3 today:

    FC 3.0
    TC 3.0
    CC 0
    pH 7.6
    CH 50
    TA 155 (yay, its finally dropping)
    CYA 50 (I need to test this myself, seeing as it jumped from 35 to 50, and there was maybe 1 puck added over that time)
    Sat Index: -0.37

    I added another gallon of Muratic Acid, and I'll test all the numbers myself tommorrow with my TF-100, I'd go do it right now if my wife weren't already waiting on me. The only one that seems really off is the CYA level. If TriChlor pucks rasied it that high after only two weeks, then that is a serious problem, how do people ever manage using Trichlor as they're only source of chlorine?

    Where do I want my CYA to be with a manually dosed pool?
    18K Gallon In Ground Gunite Pool, Quartz/Plaster Finish, 8' Spa with Spillover, 1 Grotto/Waterfall, Hayward/Goldline PS8 controller, 1.5 HP Two Speed Pump, 1HP Booster Pump for Grotto/Waterfall, Cartridge Filter,400K BTU Nat Gas Heater, Ozonator,3 Multi-Color LED Lights (Spa, Grotto, Pool).

    Ozonator is not functioing, evaluating my options, either fix it or get a new one or drop it completely.

  8. Back To Top    #8

    Re: Little to no chlorine consumption

    A gallon of Acid when your PH is already in line ?
    14,500 inground gunite
    7' connected spa with overflow waterfall
    Goldline salt water chlorine generator
    Hayward 4 cartridge filter
    Hayward 400K heater
    Completed January 07

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    duraleigh's Avatar
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    Re: Little to no chlorine consumption

    Yikes! A gallon of muriatic may have been a little "generous"

    BBB is all about testing carefully and calculating doses carefully. Did you use the pool calculator? If your pH is now below 7.0, use 20 Mule team borax to get it back to 7.0 and then aerate if your T/A is still not in line.

    I would suggest a CYA of 40 for your conditions.
    Dave S. - Forum owner
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

  10. Back To Top    #10

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    Re: Little to no chlorine consumption

    I loose only 0.5 FC for my shaded pool, if its cloudy I may loose less. I still get some direct sunlight though in the morning.
    So if you started with 6.0 three days ago and today at 5.0, not too bad. I am at only 25 CYA and you are 35.

    Wow, 1 gallon MA for 18K is a lot. My water double that and 1 quart bring my down from 7.6 to 7.4. I think you will get 6.8 now. Gee, I did not know new plaster can do that....

    Have fun with the pool...
    35,000 GL pool. In Ground. Concrete with all white ceramic tiles. Outdoor but shaded.
    Approx 36 ft by 15 feet. 2HP Hayward Super Pump, Hayward Sand Filter with Zelbrite ( Zeolite ), Hayward Cartridge Filter, Aquamatic Silver+Copper Ionizer ( suspended use since Oct 2008 ), Prozone Ozonator, 2 gram/hr, Analog Flowmeter on pipe

    Back Up Pump & Filter on trolley, Pentair 1.5HP + Pentair Cartridge Filter, Slime Bag 1 micron Jumbo Size, downstream of Cartridge

  11. Back To Top    #11

    Re: Little to no chlorine consumption

    This morning I tested everything yself with the TF-100. Its suprising pool stores can be off that much. My CYA is only 25, I feel much better about that, but I need to stop using the pucks, because I don't really want it much higher than that. PH is 7.2 this morning, so the PH rise continues. TA is finally coming down tough.

    Here are the numbers:

    PH 7.2
    FC 4
    CC 0
    TC 4
    TA 140
    CH 150
    CYA 25

    So Hopefully I can get by with just 1 or 2 more "pucks" and keep the CYA under 30. PB just said I had to keep 2 in he skimmer for the 1st 2 weeks, and he'll be back out this week to do a final start-up/pool school. Then I'm on my own.
    18K Gallon In Ground Gunite Pool, Quartz/Plaster Finish, 8' Spa with Spillover, 1 Grotto/Waterfall, Hayward/Goldline PS8 controller, 1.5 HP Two Speed Pump, 1HP Booster Pump for Grotto/Waterfall, Cartridge Filter,400K BTU Nat Gas Heater, Ozonator,3 Multi-Color LED Lights (Spa, Grotto, Pool).

    Ozonator is not functioing, evaluating my options, either fix it or get a new one or drop it completely.

  12. Back To Top    #12
    frustratedpoolmom's Avatar
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    Re: Little to no chlorine consumption

    You're not on your own, you have us.
    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

  13. Back To Top    #13

    Join Date
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    Re: Little to no chlorine consumption

    With that size pool and starting with a CYA of 25, you can use a couple of 3 inch pucks (7 oz) and end up with a CYA of 30.
    Above ground soft side Omega pool
    20 feet diameter, 4 feet deep
    Hayward sand filter
    Hayward 1 HP Matrix pump
    Hayward Aquabug Automatic Pool Cleaner

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