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Thread: Green Cloudy Water

  1. Back To Top    #1

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    Green Cloudy Water

    For the past month we have had and off and on algae problem. I ordered one of Dave's TF100 Kits and the results are as follows:

    FC - 9
    CC - .5
    PH - 7.5
    TA 180
    CYA 58

    ag 18' round 6500 US gallons, sand filter

    I used Jason's pool calculator and the results were 22oz. of muriatic acid or 12 oz. of PH down to lower the TA level and to get rid of the Algae 119 oz. of 5.25 bleach to shock. How long do I have to maintain this level of 14 ppm to get rid of the Algae and what is a safe level of FC for swimming? The weather here in Ontario is very hot
    AG 18' round 6500 US gallons, 1 Hp with 100 lb. sand (zeolite) filter

  2. Back To Top    #2
    You need to maintain the FC until:
    1) Your FC level will hold overnight
    2) you have 0 CCs (or less than 0.5
    3) your water is clear

    With a CYA of 58, you really need to shock to 18.

    Safe level for swimming? that question will have varying answers here. Some will say don an old suit, and rinse off promptly, and high FC is ok. Others say let it drop to the normal range (for you 5-9). I fall into the first camp, provided the water is decent-looking and there are no cc's.

    8000 gallon 20' x 48" round vinyl frame pool, 12" sand filter (don't have the specs on the pump), TF100 test kit
    Handy Links: PoolMath, TF-100 Test Kit, Pool School, CYA-Chlorine Chart
    "Shock" is a process, not a product!

  3. Back To Top    #3

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    How do I calculate my shock level? You gave me a number of 18 but I don't know how to get that number

    Thanks
    AG 18' round 6500 US gallons, 1 Hp with 100 lb. sand (zeolite) filter

  4. Back To Top    #4
    Add 125 OZ of 6% bleach to get your Chlorine to 18(shock level). Test water several times daily to maintain shock level until pool clears.

    Pool calculator
    http://www.poolcalculator.com/
    Hurricane Rita did not kill me, but she killed my pool!


    Intex 36'X18'x52" "elliptical pool"/ Hayward 220 filter/1HP pump 14,364 gal, or so

  5. Back To Top    #5

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    Thanks Ed, how did you arrive at the number 18 for my shock level
    AG 18' round 6500 US gallons, 1 Hp with 100 lb. sand (zeolite) filter

  6. Back To Top    #6
    Because the Higher the CYA, the higher the shock level is.
    Hurricane Rita did not kill me, but she killed my pool!


    Intex 36'X18'x52" "elliptical pool"/ Hayward 220 filter/1HP pump 14,364 gal, or so

  7. Back To Top    #7

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    If you use Jason's calculator JasonLion's Calculator and fill in your current readings, it tells you what your shock level is at the bottom of the page.

    Also, there are stickies around that point to "Ben's Best Guess" chart which shows the ideal FC and Shock levels based on the amount of CYA in your pool.
    Buggs

    14,000 gallon, in ground, plaster, free form, play pool.
    Sta-Rite Max-E-Glass with a 1.5 hp Emerson motor
    WaterCo Micron High Rate sand filter S750 490 lb, 4883 sq ft - using ZeoBest
    In floor Polaris cleaning system
    Blue Diamond robot for those after storm days when I can't wait overnight for the in floor to clean it.

  8. Back To Top    #8

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    Thanks Buggs, I never saw the chart at the bottom of the page. I noticed that there was something called CSI and mine is at .15 is this something to be concerned about and if so do you know how I lower it? I made a mistake on water total for my pool, it's 6500 not 6700. Last evening at 7:30 I added 143 oz. of 5.25 bleach and then retested at 10:30 and had to add another 79 oz. My FC reading this morning is 22.5 and CC is 0.
    AG 18' round 6500 US gallons, 1 Hp with 100 lb. sand (zeolite) filter

  9. Back To Top    #9

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    I've maintained a high FC level since Friday evening and we still have algae I haven't added bleach since Friday because my FC level held over 18. All I added yesterday and today is PH down, Im trying to lower my TA so I'm keeping my PH around 7.0 Could it be that the algae goes through the sand filter and back into the pool (we vacuumed and backwashed)? My readings this morning are.

    FC 16.5
    CC 0
    PH 7.4
    TA 180
    CYA 50

    I appreciate the help!
    Thanks
    AG 18' round 6500 US gallons, 1 Hp with 100 lb. sand (zeolite) filter

  10. Back To Top    #10

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    Are you brushing your pool every day during this clean up phase? You should be.

    Are you actually seeing green algae or dead white algae clouding your pool? If it's white, it's dead and normal.
    Buggs

    14,000 gallon, in ground, plaster, free form, play pool.
    Sta-Rite Max-E-Glass with a 1.5 hp Emerson motor
    WaterCo Micron High Rate sand filter S750 490 lb, 4883 sq ft - using ZeoBest
    In floor Polaris cleaning system
    Blue Diamond robot for those after storm days when I can't wait overnight for the in floor to clean it.

  11. Back To Top    #11

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    yes we have been brushing the pool. We will vacuum and backwash again in a couple of hours and see what happens. The algae is a greenish yellow colour. It does vacuum up and then starts returning a short time later. I don't think it's pollen because our next door neighbour has crystal clear water. We managed to get rid of the algae last weekend for a couple of days and then it returned but during that time the water was still cloudy. Is it the high TA that clouds the water?
    AG 18' round 6500 US gallons, 1 Hp with 100 lb. sand (zeolite) filter

  12. Back To Top    #12
    Maybe its mustard algae??? For mustard, you need an even higher shock level to kill it.

    With CYA of 50, you need 16 to shock and 29 to shock for mustard. (if your CYA is closer to 60, like the 58 you first listed, you need 18 to shock and 34 for mustard.)

    8000 gallon 20' x 48" round vinyl frame pool, 12" sand filter (don't have the specs on the pump), TF100 test kit
    Handy Links: PoolMath, TF-100 Test Kit, Pool School, CYA-Chlorine Chart
    "Shock" is a process, not a product!

  13. Back To Top    #13

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    When I tested this morning my cya level was at 50, but we had emptied 1/3 of the water from our pool on Friday before shocking it to try and bring the TA down.

    I guess we could have mustard algae...but wouldn't it be eating up our chlorine? I can't seem to get the FC to come down so we can use the pool.
    AG 18' round 6500 US gallons, 1 Hp with 100 lb. sand (zeolite) filter

  14. Back To Top    #14

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    we also have 0 cc's since Saturday
    AG 18' round 6500 US gallons, 1 Hp with 100 lb. sand (zeolite) filter

  15. Back To Top    #15

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    Sounds to me like it's just stuff returning from the filter.

    Try putting a skimmer sock on the return/s - maybe use some twist ties or something to keep it on there.
    You could try adding a little DE to your skimmer, so your filter filters better. Add just enough to increase the pressure 1 lb.
    Buggs

    14,000 gallon, in ground, plaster, free form, play pool.
    Sta-Rite Max-E-Glass with a 1.5 hp Emerson motor
    WaterCo Micron High Rate sand filter S750 490 lb, 4883 sq ft - using ZeoBest
    In floor Polaris cleaning system
    Blue Diamond robot for those after storm days when I can't wait overnight for the in floor to clean it.

  16. Back To Top    #16

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    We have a sKimmer sock in place, what is DE?
    AG 18' round 6500 US gallons, 1 Hp with 100 lb. sand (zeolite) filter

  17. Back To Top    #17

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    laren,

    Chlorine will clear your pool. Whether you have green algae, mustard algae, or ketchup algae ......CHLORINE WILL CLEAR YOUR POOL

    The guy from whom most of us learned used to say "your pool didn't get in it's condition in a day or two....don't expect to cure it in that time frame" It's still good advice.

    Keep your chlorine levels high (above 20 but probably not above 30 or so) and brush and vacuum and keep your filter clean and pump running.

    Tomorrow, keep your chlorine levels high, brush and vacuum and keep your filter clean and pump running.

    Tuesday, keep your chlorine levels high and brush and vacuum and keep your filter clean and pump running.

    I know I'm being obnoxious but I want to make a point....there's nothing else in your numbers that is dangerous or causing your water problems. What you are doing is a slow killing and clearing process that is bulletproof unless you get sidetracked on some peripheral issues.

    Give it a few more days but don't get sidetracked.....your water will clear up if you do the above.

    (if it doesn't, I will make one more post blaming the whole thing on SeanB and then I will become very scarce on the forum!! )
    Dave S. - Forum owner
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

  18. Back To Top    #18
    Dave is right, got me from swamp water to sparkling blue inside of two weeks!
    Hurricane Rita did not kill me, but she killed my pool!


    Intex 36'X18'x52" "elliptical pool"/ Hayward 220 filter/1HP pump 14,364 gal, or so

  19. Back To Top    #19
    MikeInTN's Avatar
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    Quote Originally Posted by duraleigh
    (if it doesn't, I will make one more post blaming the whole thing on SeanB and then I will become very scarce on the forum!! )
    Classic!!
    24' x 52" AGP - approx 13,500 gallons
    Pentair Optiflo 1 hp/2sp pump w/ Swimpro Voyager 150 sq ft cartridge filter
    Intex 8110 SWCG
    "Fear the Schnauz!"

  20. Back To Top    #20

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    Thank you Dave.....I received my test kit last Thursday (it only took 5 days!) and I don't know how I managed without it!

    I will keep the Chlorine level high for the next few days, but it concerns me because it doesn't drop. I shocked on Friday evening and on Sunday afternoon the FC was still 16. I'm going out now to do another reading, I'll keep you posted.

    Thank you,
    Laurie
    AG 18' round 6500 US gallons, 1 Hp with 100 lb. sand (zeolite) filter

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