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Thread: Chemicals got off in just a few days absence

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    Chemicals got off in just a few days absence

    Hi all,

    First time post here looking to gain some assistance. We have an Intex above ground pool, 22 feet by 52 inches deep, roughly 10500 gallons of water with a salt water system. We purchased this unit last year and did well most of our swimming season here in Southern Iowa.

    Got it up earlier this year than last, kids got in before Memorial Day this year, and it has been quite hot here the last 3 weeks (in the 90's almost everyday). We were gone for about 4 days and in that time our chemicals started getting out of whack. I have a TF-100 test kit, bought at the recommendations of this site last year, and have been doing well with frequent checks and getting fairly solid results. However, when I checked them tonight here is what we currently have for numbers:

    ph 7.2 (had been right at 7.5)
    chlorine went from right round 2/4 ppm to non existent tonight
    calcium is running around 175 ppm
    alkalinity has maintained a level of 40
    CYA took a dive to 30 from 50
    salt level dropped to 2800 from 3200

    I don't want to over react with things and create any new issues, but certainly want to stay on top of things to make sure we don't have anything major start to take over our pool either. My son thinks it appeared like that there might have been some staining on the sides of our pool tonight, but my eyesight didn't detect that, although admittedly his eyesight is better than mine.

    Thoughts and suggestions would be greatly appreciated.


    Rick
    Intex Ultra Frame above ground pool
    22' x 52" deep
    10472 gallons
    Krystal Clear Model 633T Filter Pump
    Salt Water System with E.C.O. (model 8110)

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    aussieta's Avatar
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    Re: Chemicals got off in just a few days absence

    welcome to TFP
    at the top of the page is a link to pool school which will be of help to you
    your ph may be low as your ta is also low
    cya and salt would be within the +/- error for the test
    as your chlorine has dropped below minimum you will need to perform a slam
    get some chlorine in there asap
    long term maybe a bit of bicarbonate soda to raise ph and ta
    SWG inground peanut shaped eco-bright concrete pool
    50,000 litres 13,000 gallons
    Lincoln Salt Chlorinator, 25 gram cell Sand Filter with glass media
    Taylor K2006-C test kit, Taylor K-1766 salt test, Dolphin M500 pool cleaner
    are you taking care of your pool or is the poolshop taking care of you

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    domct203's Avatar
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    Re: Chemicals got off in just a few days absence

    Quote Originally Posted by Rick1970 View Post
    Hi all,

    First time post here looking to gain some assistance. We have an Intex above ground pool, 22 feet by 52 inches deep, roughly 10500 gallons of water with a salt water system. We purchased this unit last year and did well most of our swimming season here in Southern Iowa.

    Got it up earlier this year than last, kids got in before Memorial Day this year, and it has been quite hot here the last 3 weeks (in the 90's almost everyday). We were gone for about 4 days and in that time our chemicals started getting out of whack. I have a TF-100 test kit, bought at the recommendations of this site last year, and have been doing well with frequent checks and getting fairly solid results. However, when I checked them tonight here is what we currently have for numbers:

    ph 7.2 (had been right at 7.5)
    chlorine went from right round 2/4 ppm to non existent tonight
    calcium is running around 175 ppm
    alkalinity has maintained a level of 40
    CYA took a dive to 30 from 50
    salt level dropped to 2800 from 3200

    I don't want to over react with things and create any new issues, but certainly want to stay on top of things to make sure we don't have anything major start to take over our pool either. My son thinks it appeared like that there might have been some staining on the sides of our pool tonight, but my eyesight didn't detect that, although admittedly his eyesight is better than mine.

    Thoughts and suggestions would be greatly appreciated.


    Rick
    Welcome.

    If your SWG cannot keep up with the FC demand it is either the sun burning it off or you have caught the beginning of an algae bloom. You should supplement with liquid chlorine as we determine what is going on. If your FC has been down around 2ppm you have been below your minimum FC value for your CYA (at 50ppm CYA your absolute minimum FC level is 2.5ppm with a SWG) you most likely allowed algae to take hold.

    Perform the OCLT to determine if this is something organic. Be sure to shut down the SWG for the OCLT.

    http://www.troublefreepool.com/conte...loss-test-oclt

    If you do not pass the OCLT you will need to SLAM the pool.

    http://www.troublefreepool.com/conte...tain-shockingl

    Dom
    Dom - TFP Guide
    Intex 18' X 48" Ultra Frame AGP 6700 gallons | Two Intex CS8110 SWG's | Hayward Pro Series 21" Sandfilter | Hayward 1.5HP Power Flo Matrix pump | Hayward Thru-wall Skimmer | Wanda the Whale | 72 sq ft of Sungrabber Solar Panels with Hayward GLC-2P-A | Taylor K2006 Test Kit, Sample Sizer & Speed Stir | Click Here To Become a TFP Supporter!

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    bmoreswim's Avatar
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    Re: Chemicals got off in just a few days absence

    The main takeaway here is that your pool does need regular testing and then related chemical/automation adjustments. Regular testing generally means daily or every other day if things are dialed in. Going away for a few days really isn't possible. JK! It just takes some pre-planning and really being aware of your pool's needs.
    FC is a consumable and needs to be replenished which your SWG is doing. Adjusting the % output or pump runtime will affect the amount of chlorine produced.
    pH will tend to increase when using a SWG. Yours did not but there are other things that could affect it. But just keep logging your testing in a notebook so you always have a reference for future situations.
    18'x38' Rectangle (3'-8 1/2' deep w/ diving board) - 27K gal. w/ gray plaster
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    Re: Chemicals got off in just a few days absence

    Thanks everybody for your input. I added alkalinity increaser about 12:00 and have some chlorine to add as well. Give that a start and see where we go from there.

    Rick
    Intex Ultra Frame above ground pool
    22' x 52" deep
    10472 gallons
    Krystal Clear Model 633T Filter Pump
    Salt Water System with E.C.O. (model 8110)

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    Mr Bruce's Avatar
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    Re: Chemicals got off in just a few days absence

    You would have been better off getting chlorine in there immediately. TA is the last thing you need to worry about. Also, if you are buying something called "Alkalinity Increaser" you are paying for very expensive baking soda which you can get at the grocery store.
    32K gallon Plaster - 1hp Hayward 2 speed Super Pump - Hayward S200 Sand Filter - TF100XL
    Test Kits - Pool Math - Chlorine/CYA/Target/Slam Chart

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    Re: Chemicals got off in just a few days absence

    Thanks Mr. Bruce. I just happened to have the alkalinity increaser on hand and it was something I was told by a friend to keep on hand. I actually didn't pay too much for it and price wise was about the same as the baking soda and got it all in one pail versus several boxes for the same amount. I went out and got chlorine today and have added some according to the calculator numbers and will check them tonight to see how we are doing. Once again thanks for all of the help everyone.

    Rick
    Intex Ultra Frame above ground pool
    22' x 52" deep
    10472 gallons
    Krystal Clear Model 633T Filter Pump
    Salt Water System with E.C.O. (model 8110)

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    domct203's Avatar
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    Re: Chemicals got off in just a few days absence

    Quote Originally Posted by Rick1970 View Post
    Thanks Mr. Bruce. I just happened to have the alkalinity increaser on hand and it was something I was told by a friend to keep on hand. I actually didn't pay too much for it and price wise was about the same as the baking soda and got it all in one pail versus several boxes for the same amount. I went out and got chlorine today and have added some according to the calculator numbers and will check them tonight to see how we are doing. Once again thanks for all of the help everyone.

    Rick
    Have you performed an OCLT to make sure algae is not starting to grow from the low FC levels?

    Dom
    Dom - TFP Guide
    Intex 18' X 48" Ultra Frame AGP 6700 gallons | Two Intex CS8110 SWG's | Hayward Pro Series 21" Sandfilter | Hayward 1.5HP Power Flo Matrix pump | Hayward Thru-wall Skimmer | Wanda the Whale | 72 sq ft of Sungrabber Solar Panels with Hayward GLC-2P-A | Taylor K2006 Test Kit, Sample Sizer & Speed Stir | Click Here To Become a TFP Supporter!

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