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Thread: Pool want more chlorine than was made this year :)

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    Pool want more chlorine than was made this year :)

    I cannot seem to feed my pool enough chlorine. Woke up after a heavy rain last week to find the pool milky white. Chlorine was down to about 1ppm and pH was low. Started adding bleach, about 5 96oz bottles. Pool turned dark green, and pH was even lower. This weekend I have added 20 gallons of bleach, and 3 boxes of 20 mule team Borax, pH is only up to 7.2 and chorine levels reached about 3ppm. I have never had a problem like this and am quite confused. Pool is a 20 x 40 IG vinyl pool. There is no slime or sliperyness, just green. Yesterday the shallow end finally looks clear and the deep end is only light green. Today I added three more gallons bleach. What happened?
    20x40 IG vinyl, heatpump and solar and 3 siberian huskies, 10kw PV solar electric system. Nikon Photographer D800e dSLR.

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    dmanb2b's Avatar
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    Re: Pool want more chlorine than was made this year :)

    Can you post a full set of #'s? If your CYA has disappeared over the offseason, it could have converted to ammonia, but it could also just be organics?
    24'x52" AGP (13,500 Gallons), Intex SWG, (2)Solar Bear 4x20 panels, Hayward S220T Filter, 1/2hp Pentair Superflo

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    Re: Pool want more chlorine than was made this year :)

    Well I'm going to have to go out and buy some more reagents to do those tests, but it appears to be getting better finally. Its just strange how it went from crystal clear on Weds to milk white on Fri, and dark green on Sat. Its now clear in the shallow end and slightly green tinted in the deep. I did add 4 pounds of CYA on Saturday, as I have not added any in a year or two and figure between rain dillution and filter backwashing I have lost a bunch.

    This is the first time in 10 years I have ever had a problem. You are not going to believe how I normally test my water and determine when to add bleach. Not scientific, but it has worked well -- I use the taste test. Yes I am serious.
    20x40 IG vinyl, heatpump and solar and 3 siberian huskies, 10kw PV solar electric system. Nikon Photographer D800e dSLR.

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    Mod Squad Bama Rambler's Avatar
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    Re: Pool want more chlorine than was made this year :)

    I bet it hasn't worked nearly as well as you think it has.
    Seriously, a good test kit is a drop in the bucket compared to the last two items in your sig. Get yourself one and stop guessing!
    Dave J. TFP Moderator
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    Re: Pool want more chlorine than was made this year :)

    I have a good test kit, just need to replace the reagents. Not sure what you mean about it not working as well as I think, I have never had an algae problem in ten years. Not sure this is algae either, as it is not slippery at all, but perhaps. I think it was just a huge load of pollen that washed in from the woods behind our house after a huge down pour.

    As for the last to items in my sig, it gets worse. I have a very bad case of NAS, and it now includes the following:


    Nikon D300, D90, D5000, NIKON GLASS 85mm F/1.8 D, 105mm f/2.8 Micro AF-S VR, 18-200 AF-S VR, 70-300AF-S VR, 70-200VR AF-S VR f/2.8, 10.5mm Fisheye, 24-70 AF-S f/2.8, Sigma 10-20mm HSM, Sigma 30mm f/1.4 HSM, Tamron 200-500mm, 2 SB-600 Speedlights, Manfrotto 190MF3 tripod & 322RC2 ball grip head.
    20x40 IG vinyl, heatpump and solar and 3 siberian huskies, 10kw PV solar electric system. Nikon Photographer D800e dSLR.

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    Re: Pool want more chlorine than was made this year :)

    Living in the pacific northwest, I deal with a lot of rain water.

    Rain water actually has a very low pH... around 5.7.

    However, I usually find that the aeration caused by the rain actually tends to ballence any changes in pH, meaning that during the rainy seasonS, it is the TA that I have to keep an eye on. (Also, rain water has a low TA, and usually dilutes the TA in the pool water).

    But, of course, my results are not going to be everyones.

    I am thinking that perhaps you had a high TA and CH to begin with, and the drop in pH lowered you CSI to the point where you were you found the pool "milky white".

    You then raised the pH with Borax, and gave a shock. The raising the pH could have increased your CSI, clearing the milky white, BUT... if you had copper in your water, the shock could have oxidized the copper, turning your water green.

    If it were me, I'd:

    -Get a full set of numbers to see if the CSI would support the milky white water.
    -Do an overnight chlorine loss to see if you are fighting algae.

    If you are not losing chlorine over night, get your water tested for metals.

    Based on this information, you may find yourself continuing with your shock, adjusting your TA (and hopefully not your CH "too"), adding a sequesterant.

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    Re: Pool want more chlorine than was made this year :)

    Interesting theory. Not sure if it applies though as the Borax was not added until day three of the follies. Where would copper come from? It is a vinyl pool with PVC lines and a titanium heat exchanger - no copper in the system to leach out. Also don't think aeration is a factor as the water rain seeps into the pool as the solar cover was inplace so there was no rain directly hitting the water's surface.
    20x40 IG vinyl, heatpump and solar and 3 siberian huskies, 10kw PV solar electric system. Nikon Photographer D800e dSLR.

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    Re: Pool want more chlorine than was made this year :)

    Ahhh... the lack of aeration would explain how the acidic rain (relative to your pool water) would drop your pH instead of your TA.

    Yea... my theory is a "little" far fetched. Just seeing stuff a little atypical... (I'm used to algae going green to white, not white to green).

    Overnight test should answer the question as to if you are fighting algae. If so, you know what to do. If not, I think more tests are in order. Copper can come from all sorts of places, even your source water, and accumulate over time.

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    Re: Pool want more chlorine than was made this year :)

    CSI usually works the other way around, high CSI meaning calcium is getting saturated which will lead to precipitated calcium as clouding/scaling, lowering CSI will clear it up.

    An overnight FC loss test can do no harm and could point the way out. Or a chlorine-demand bucket test.
    --paulr
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    Re: Pool want more chlorine than was made this year :)

    Your right... as the pH RISES, the CSI rises, causing the saturation.

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    Re: Pool want more chlorine than was made this year :)

    Today pool is fairly clear in shallow end but still has a green tint in dark end.

    Total and Free Chlorine both read 2.0
    pH is 7.0
    Total Alk is 50.

    I just added another 4 pounds borax, 12 pounds baking soda and 1.5 gallons chlorine.
    20x40 IG vinyl, heatpump and solar and 3 siberian huskies, 10kw PV solar electric system. Nikon Photographer D800e dSLR.

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    JasonLion's Avatar
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    Re: Pool want more chlorine than was made this year :)

    Do you know what your CYA level is? Or what is was before you added more?
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
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  13. Back To Top    #13

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    Re: Pool want more chlorine than was made this year :)

    No, not really. I did not add any last year and only used about 20 pucks. So, I figured it was probably low and hence added 4 pounds as the chlorine was vanishing so quickly. It is definitely getting better, but at a decreasing rate of improvement the last day or so.
    20x40 IG vinyl, heatpump and solar and 3 siberian huskies, 10kw PV solar electric system. Nikon Photographer D800e dSLR.

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    dmanb2b's Avatar
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    Re: Pool want more chlorine than was made this year :)

    FC at 2.0 is pretty low...but again, not sure what your CYA # is? Also interesting FC testing method above...I usually keep our FC in the 6-9ppm range and can't taste it and barely get any chlorine smell.
    24'x52" AGP (13,500 Gallons), Intex SWG, (2)Solar Bear 4x20 panels, Hayward S220T Filter, 1/2hp Pentair Superflo

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    Re: Pool want more chlorine than was made this year :)

    Just checked pool this morning after making yesterday's additions:

    Cl Free 0.75
    Cl total 1.5
    pH 7.3
    Total Alk 100

    So, except for chlorine it is looking much better. Added another 3 gallons bleach.

    I'm going to take a sample to the "pool store" and have them test it today.
    20x40 IG vinyl, heatpump and solar and 3 siberian huskies, 10kw PV solar electric system. Nikon Photographer D800e dSLR.

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    esim13's Avatar
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    Re: Pool want more chlorine than was made this year :)

    Please Please test your CYA then post your results like this:
    FC
    CC
    pH
    TA
    CH
    CYA
    It makes it soooooo much easier to read and gives everyone all the info they need. Thanks!
    10,408 gallon, 21' round, 52 in' deep AG, half in ground
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    Re: Pool want more chlorine than was made this year :)

    So I went to the pool store and had them test the water. They have a fairly sophisticated setup. They have a bunch of square-sided "testtubes" that each have powdered reagents in them for a set test. They use a pipet to inject water into each one and then use a computer controlled colorimeter to directly measure and record the readings into the computer. Any way, here is what they came up with:

    FC 3.8
    TC 3.8
    pH 7.7
    TA 90
    CU & FE ~0
    Stabilizer 10 ah ha!, BUT wait...

    How can we believe the stabilizer is only 10? Wasn't it on Saturday that I added four pounds of CYA to my 20x40 IG pool. Doesn't that increase the level by about 30 all by itself? So, now what????
    20x40 IG vinyl, heatpump and solar and 3 siberian huskies, 10kw PV solar electric system. Nikon Photographer D800e dSLR.

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    frustratedpoolmom's Avatar
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    Re: Pool want more chlorine than was made this year :)

    It can take a week for your CYA to fully dissolve and register. I'm a big skeptic of pool store testing regardless of how elaborate their set up is. If you added enough to reach 30 and you didn't backwash then you should have 30. Give it another few days and test it again and you can always add more later.
    Helpful links: Pool School; CYA/Chlorine Chart
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