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Thread: Green Pool

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    Green Pool

    Sorry this is a long story. I am trying to help out an old pre-katrina neighbor, and good friend of mine, with a pool disaster. The owner of the pool is an elderly lady who went to her local pool store ever since the pool was drained and filled about 10 years ago after hurricane katrina flooded the area with 6 feet of saltwater and about a foot of marsh mud on the ground and a few feet of mud in the pool. She really only keeps the pool for her neighbors grandkids to swim in and he asked me to take a look at it since he was going to take over the pool maintenance and he has never seen my pool green. Well she must have been dealing with the most incompetent pool store employee to have walked the face of the planet. The pool was totally green and the girl who did the water testing kept telling her that the water was testing fine so dump in a couple of pounds of shock and it should be good. When I tested this green pool the Chlorine was 43.5 and the CYA was WAY BELOW the 100 line on the TFT-100 cya tube so I took a pool store close to where I live now, which is pretty good as pool store go, and they told me the CYA was 175. As you might suspect they have been using tablets in an inline dispenser for the 10 years.

    I had him change water till the CYA tested 80 on with the TFT-100. Shock level was 31 so I had him bring it up well in the 30ís and I lent him my test kit to do the shocking. I went over there and he had been maintaining a shock level of chlorine for several days and the pool was still green but just not as dark and getting a little bit of the cloudy or miky-ish look to it but make no mistake it was still green. The filter has only gained about 1psi. I did add some algaecide just because I had some laying around and as bad as things were looking, I figured what harm could it do.

    Well here is where things get a little crazy. He told me the pool in this condition passed an overnight chlorine loss test! I had trouble believing it and was going to be around late that evening and the next morning so I did it myself and the pool had no loss of chlorine overnight and had less than .5 CC! After talking to him I realized either I forgot to tell him or he didnít remember, but either was the pool was not getting brushed at all. I know the not brushing could be a problem due to biofilm, but could that possibly explain the no chlorine loss overnight?

    He stopped shocking over the weekend to deep clean the sand filter because he was thinking he might have a mechanical problem with the psi not rising. He told me on the outer edge of the filter, about half the distance from the outside of the filter to the stand tube was packed so tight he could hardly penetrate it with a dowel when he started. He cleaned it out good and put it back together. As it stood tonight the cl level had fallen all the way to 11 so we may be starting over tomorrow. I donít have all the test results in front of me but will get them tomorrow and post them but the other test numbers I didnít mention here looked pretty good.

    So when he goes back to shocking or slamming whatever we call it these days, is there anything else you guys can see he needs to do? Is there any possibility, with the cya level so high for so long, and the pool being green for at least a month that I know of, that this pool has bred some sort of chlorine resistant algae? Should he try to maintain the chlorine level even higher than 31 he was doing for a week without a lot of progress? Could it hurt anything to raise it a lot more to try to knock it down?

    About to the pool:
    15000 gallons
    Sand filter
    1 Skimmer
    2 Returns
    10,800 gallons Gunite/Plaster
    Hayward 244t 24" Sand Filter with Zeo
    1 1/2 HP Challenger
    Digital Pool Pilot DIG-220 SC-48
    Located in NOLA

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    pabeader's Avatar
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    Re: Green Pool

    Welcome to TFPC. We are glad you are here and willing to help a friend in need!! (I can tell you've been here before but a hearty "Hello" is always nice to hear, right?)

    Pictures are going to be a big help here. You need to document the change from day to day. I would recommend taking a pic at a ladder or stairway, as these offer the best place to see the daily change. And post them here so we can see what going on.

    No chlorine loss is interesting. Did you forget to have him turn off the SWG? It should be off during a SLAM since it's making chlorine you won't see a drop. Plus, the generator cell of a SWG has a lifespan, since you are manually adding you might as well save the cell.

    Make sure he is checking and adding on a regular basis. At least every couple of hours in the beginning.

    It is possible that some of the green isn't algae but copper from the algaecides that have been used. Time will tell on that front.
    Bob - Palm Beach by San Juan Pools. approx 5000 gals., Pentair 320 cartridge filter (all new guts installed by me), Goldline SWG, 'New to me' Kreepy Krauly Sand Shark, Intermec 104 Timer Test kit: TF-100 w/Speed Stir

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    pabeader's Avatar
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    Re: Green Pool

    Also, please post a complete set of numbers so we can look for any hidden gotchas.
    Bob - Palm Beach by San Juan Pools. approx 5000 gals., Pentair 320 cartridge filter (all new guts installed by me), Goldline SWG, 'New to me' Kreepy Krauly Sand Shark, Intermec 104 Timer Test kit: TF-100 w/Speed Stir

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    Mod Squad kimkats's Avatar
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    Re: Green Pool

    All of what Bob said! He has you covered. I just wanted to add

    -brush at least twice a day

    The pics will help the most I bet right now. That way everyone will be able to see the color change and really see what is going on.

    Kim
    TFP Moderator 33x52 round AG 25,600 gals Sand Filter 1.5hp Pump - 2 Speed, SLAM, Pool School, Recommended Levels, Recommended Chemicals, Pool Math, Chlorine/CYA Chart, TF-100 Test Kit

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    domct203's Avatar
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    Re: Green Pool

    Quote Originally Posted by pabeader View Post
    .........
    No chlorine loss is interesting. Did you forget to have him turn off the SWG? It should be off during a SLAM since it's making chlorine you won't see a drop. Plus, the generator cell of a SWG has a lifespan, since you are manually adding you might as well save the cell.........
    OP states using tablets in a feeder for 10 years, hence the sky high CYA.

    Pictures will definitely help. Has the pool been regularly treated with algecide in the past? What kind of algecide did you add?

    It's indeed strange that there was no overnight loss, yet the FC dropped from the 30's to 11 in a couple of days. Did the pool get brushed over the weekend?

    If he can get the CYA lower that would be a big help.

    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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    Swampwoman's Avatar
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    Re: Green Pool

    I honestly think you have a better chance of getting her squared away if you instead have him do one more drain to try to get closer to 40-50 cya.
    In ground extended Grecian, 22,000 gal, Hayward 220t sand filter, vinyl liner, dolphin m4 supreme.
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    Re: Green Pool

    Sorry about not getting back sooner guys. The pool needed to be re-plastered so the pool owner decided to just push up the timeline and re-plaster now instead of in the spring. I will post a new thread about starting the pool up. Thanks for the help and didn't mean to waste any ones time.
    10,800 gallons Gunite/Plaster
    Hayward 244t 24" Sand Filter with Zeo
    1 1/2 HP Challenger
    Digital Pool Pilot DIG-220 SC-48
    Located in NOLA

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