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Thread: What WAS in my pool!!

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    What WAS in my pool!!

    I've heard the saying if you live long enough you will probably see or hear just about anything. Well here is a new one for me. After church this morning we decided to let the grandkids swim in the pool. I have had the solar blanket on the pool since 2 Sep. We took it off long enough on 12 Sep to swim and then put it back on. Anyway as I was removing the blanket today the water smelled terrible. When I get the blanket completely off I spotted the source of the bad smell. A full size possum (that's what we call them here in the south) had drowned and started to decay or rot under the blanket. There is an oily film on the water. I did a vacuum to waste of the bones that were on the bottom of the pool. Put the vinyl gloves on and got that stinking possum out of the pool.

    Here are the most recent test results from 9 AM 26 Sep
    FC 7 -- this was after I added and circulated 364 ounces of bleach on 25 Sep.
    CC 0.5
    TA 60
    CYA 20
    pH 7.2

    What are your recommendations on treating this stinking pool? The solar blanket will not go back on this year. If I can't get to smell off it then it is making a trip to the trash dump. Hopefully I can winterize the pool sometime in late October.
    In-ground concrete/vinyl 21000 g, sand filter, Pentair 1 HP and 50 gpm. Pentair Legend in-pool cleaner, Nature 2 system (cartridge removed).

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    TizMe's Avatar
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    Re: What WAS in my pool!!

    My thoughts would be if the smell wont come out by scrubbing with bleach and water then its not going to come out. Someone might have other suggestions though.

    As far as the water smelling I would think the smell would go away after shocking it for a day or two. Only other thing I can think of is a partial drain and fill may dilute the smell.
    Les
    Don't have a pool right now. Just sharing what I have learned over the years!
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    polyvue's Avatar
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    Re: What WAS in my pool!!

    Quote Originally Posted by rocky
    What are your recommendations on treating this stinking pool?
    I concur with TizMe and would suggest shocking your pool for at least two days and nights. Brush the sides and bottom, and backwash that filter, too.
    14,555 gal in-ground 16'x29' white plaster Pool w/spa (2007); Goldline Aqua Logic AQL-PS-8 control w/Aqua Cell 15 Salt Water Chlorination (SWCG); Hayward TriStar 1HP (1.85 SF) main / 1.5HP (1.60 SF) spa pumps; Hayward Swimclear cart filter C4025, ColorLogic LED lights; Tankless SP-18-4 electric heater; Polaris 280 cleaner.
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    Re: What WAS in my pool!!

    That information is pretty much what I had decided to try.

    Here is my current plan and actions: I have the filter and automatic Pentair pool cleaner on for 24 hours each day. Last night I added 182 ounces of bleach without first measuring the FC level. Anything that gets that foul pool water on it stinks. I don't want to subject the pool brush or the test kit components, at this time, to the stinking pool water. I don't know how much chlorine was consumed by the sun's UV yesterday and the organics from the dead possum. The bleach I added should get the FC in the 11 ppm range or shocking level. This is based on previous daily chlorine consumption of 1 ppm per 24 hours and the low CYA value of 20 ppm. More bleach will be added daily as needed.

    I might even backwash the filter again and then add some bleach through the skimmer intake. After observing the results of these actions, then I will decide what to do. I am hoping the chlorine will get rid of the stinking water problem. However, I am concerned the chlorine will not help remove the "oily" film on everything the water has contacted. I'm keeping an open mind on this and looking forward to anyone's comments.
    In-ground concrete/vinyl 21000 g, sand filter, Pentair 1 HP and 50 gpm. Pentair Legend in-pool cleaner, Nature 2 system (cartridge removed).

  5. Back To Top    #5
    TizMe's Avatar
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    Re: What WAS in my pool!!

    Try putting a skimmer sock or two in your skimmer basket. That might catch the oil. The oil COULD BE whats causing the odor .........
    Les
    Don't have a pool right now. Just sharing what I have learned over the years!
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    Mod Squad zea3's Avatar
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    Re: What WAS in my pool!!

    You may want to change your sand when you are done too. You also might want to try some of those absorbent mats they use to clean up oil spills.
    TFP Moderator
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    Butterfly's Avatar
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    Re: What WAS in my pool!!

    You might find some helpful info here: motor-oil-and-brake-fluid-dot-3-help-t16253.html
    TFP Moderator TF100 Test Kit TF100 TestKit YouTube Channel PoolMath
    You're done SLAMing when:
    1)You lose 1ppm or less FC overnight, & 2)You have .5ppm CC's or less, & 3)your water is clear.

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    Re: What WAS in my pool!!

    1. Toss the solar cover

    2. Elevate your FC levels until the pool is cleared

    3. Continually brush and clean the sides of the pool where any oily residue will accumulate....use a throw-away long handled deck brush....a little bit of cleanser will help

    4. Backwash as necessary

    5. Keep the pool uncovered and let Mother Nature and the elevated chlorine clear the pool.
    Dave S. - Forum owner
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
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    Re: What WAS in my pool!!

    Thanks for all the good advice.

    I failed to mention I had put a nylon sock over the skimmer basket. That appears to be catching the oily film on the water surface.

    This morning I scrubbed the vinyl above the current water level with a product called Off the Wall. I had it from a previous pool. It is made especially for cleaning and conditioning the vinyl liner.

    I will test the water this evening and post the results of the FC and CC.

    Anyone care to comment on me pouring 1 jug of bleach through the skimmer basket? This would be done after the evening backwash and after checking the FC and CC.
    In-ground concrete/vinyl 21000 g, sand filter, Pentair 1 HP and 50 gpm. Pentair Legend in-pool cleaner, Nature 2 system (cartridge removed).

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    Re: What WAS in my pool!!

    6 PM results of water testing:

    FC 5 ppm
    CC 0.5 ppm

    FC loss from 8 PM last evening to 6 PM today was about 6 ppm.

    Added 2 jugs (364 ounces) bleach. I will retest in the AM.

    The stink is almost gone. Water is still crystal clear with a few bleached possum bones scattered on the pool bottom.
    In-ground concrete/vinyl 21000 g, sand filter, Pentair 1 HP and 50 gpm. Pentair Legend in-pool cleaner, Nature 2 system (cartridge removed).

  11. Back To Top    #11
    TizMe's Avatar
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    Re: What WAS in my pool!!

    Why are you wanting to pour a bottle of bleach through the skimmer basket ?
    Les
    Don't have a pool right now. Just sharing what I have learned over the years!
    Helpful Links:
    Pool School,Pool Calculator,Cl/CYA Shock Chart,TF Test Kit
    Doing BBB and loving it!

  12. Back To Top    #12
    polyvue's Avatar
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    Re: What WAS in my pool!!

    Quote Originally Posted by TizMe
    Why are you wanting to pour a bottle of bleach through the skimmer basket ?
    Right. Anywhere you pour the bleach (deepend or shallow, skimmer or not) is going to affect the chlorine level in the entire pool after a few minutes of circulation.
    14,555 gal in-ground 16'x29' white plaster Pool w/spa (2007); Goldline Aqua Logic AQL-PS-8 control w/Aqua Cell 15 Salt Water Chlorination (SWCG); Hayward TriStar 1HP (1.85 SF) main / 1.5HP (1.60 SF) spa pumps; Hayward Swimclear cart filter C4025, ColorLogic LED lights; Tankless SP-18-4 electric heater; Polaris 280 cleaner.
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    Cherie's Avatar
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    Re: What WAS in my pool!!

    Just to add my two-cents' worth, I add our bleach through the skimmer. But the most I usually add, when I'm not using the solar cover (since the cover almost stops FC loss), is about 1 qt of 6%. I put 1/2 in my pitcher, fill it with pool water and add it to the skimmer. Then I repeat the process once more to get my full quart of 6% and I'm done. I do it this way because I leave our pump on low all the time and I like the idea that it's going straight to each end of the pool via the returns. I'm sure it would all mix in eventually, but I just like knowing that it's already gone through the filter and back out to each end of the pool before I even put the lid back on my bleach jug!
    32x16 buried Doughboy, 4' shallow - 7' deep
    Pentair Dynamo 1 hp, 2-speed - Pentair 150# SD40 w/zeolite (75#)
    One skimmer/two returns/Aquabot Turbo T2

  14. Back To Top    #14

    Re: What WAS in my pool!!

    I want to add the bleach through the skimmer to have a faster impact on the sand filter. I know if I add the bleach directly to the pool water it will eventually make its way through the filter.

    Duraleigh recommended elevating the chlorine level. Therefore, I added the remaining quantity of Chlorox bleach to the pool.
    In-ground concrete/vinyl 21000 g, sand filter, Pentair 1 HP and 50 gpm. Pentair Legend in-pool cleaner, Nature 2 system (cartridge removed).

  15. Back To Top    #15

    Re: What WAS in my pool!!

    The 6:30 AM test results are:
    FC 12.5 ppm
    CC 0 ppm

    The smell from the dead possum is just about gone. There was insufficient daylight to determine if the oily film on the water surface was gone.

    Will test FC this evening and report results.
    In-ground concrete/vinyl 21000 g, sand filter, Pentair 1 HP and 50 gpm. Pentair Legend in-pool cleaner, Nature 2 system (cartridge removed).

  16. Back To Top    #16

    Re: What WAS in my pool!!

    Tested the water at 6:30 PM:

    FC 8.5 ppm
    CC 0 ppm

    According to pool calculator 182 ounces of bleach should get the FC close to 13 ppm. Since the CYA is 20 ppm this bleach addition will get the pool back to the shock level.

    Oily film is slowly disappearing, I think.
    In-ground concrete/vinyl 21000 g, sand filter, Pentair 1 HP and 50 gpm. Pentair Legend in-pool cleaner, Nature 2 system (cartridge removed).

  17. Back To Top    #17

    Re: What WAS in my pool!!

    Here are the results of today's 6:30 AM testing:

    FC 11.5 ppm
    CC 0 ppm


    The FC results raise questions. Last evening the FC was 8.5 and I added 182 ounces Chlorox bleach. According to the Pool Calculator my FC should have been almost 13 but it was 11.5. At 6 PM on 28 Sep the FC was 5 and I added 364 ounces Chlorox bleach and expected the FC to be about 13.4 but it was only 12.5. Is the chlorine being consumed at night from the organics remaining in the pool? Is this Pool Calculator in error or is this normal? How much longer should I keep the FC elevated?
    In-ground concrete/vinyl 21000 g, sand filter, Pentair 1 HP and 50 gpm. Pentair Legend in-pool cleaner, Nature 2 system (cartridge removed).

  18. Back To Top    #18
    Mod Squad Bama Rambler's Avatar
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    Re: What WAS in my pool!!

    One common reason for chem additions not matching expected results is incorrect pool volume being entered into the calculator. This is especially true with in-ground pools where exact measurenments are usually hard to take. I'd bump your gallons up a few hundred at a time till it's close to right.
    Dave J. TFP Moderator
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  19. Back To Top    #19

    Re: What WAS in my pool!!

    I was thinking pool volume I use of 21,000 gallons could be low. I will raise it to 22,000 gallons and use the Pool Calculator to determine the required amount of bleach to add.

    How long should I keep the FC level elevated? My recent posts report the test results.
    In-ground concrete/vinyl 21000 g, sand filter, Pentair 1 HP and 50 gpm. Pentair Legend in-pool cleaner, Nature 2 system (cartridge removed).

  20. Back To Top    #20
    Mod Squad Bama Rambler's Avatar
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    Re: What WAS in my pool!!

    Do an overnight chlorine drop test to ensure there's nothing in there. Once that holds you should be good to let the FC drop to normal levels.
    Dave J. TFP Moderator
    24' x 52" Round AGP. 2hp/¼hp SPL Power-Flo 2-speed pump. 200sqft Waterway Cartridge Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
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