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Thread: Cloudy wahter and a bit of green sand (bottom)

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    Cloudy wahter and a bit of green sand (bottom)

    Hey,

    Yesterday my wather was like this:
    FC: 2 or 3
    PH: 7.4
    Stab: 75-80
    ALK: 90
    Calcium: 170
    Its a pool with SWG.

    My problem was:
    1) My wather was cloudy. I can perfectly see the bottom (from top), but cannot see the other side of the pool from one side to the other (under wather). I have a 24 feet pool.

    2) I have a lot of sand deposites on the bottom, when I shake the sand, it turns green for fes seconds. I do not see any algeas in the wather.

    What I did:
    I skocked the pool yesterday night (5L of bleach to shock) and kept the pump working all night and all day today (so far).
    At 8h00am this morning my FC was 13
    At 2h00pm my FC was 10

    Questions:
    - Did I do the right thing (schock the pool)?

    - I think my cloudy wather has nothing to do with my little geen sand spots (pool bottom), it is maybe du to not enogh filtering (10 hours a day since the beginning of the season, I should filter). Am I right?

    - When can I swim again? Do I have to wait until FC is back to 4 or is it ok when it's higher?

    BIC
    Don
    SW Florida
    10,000 gal in ground concrete pool
    Pentair Cartridge filter
    Pentair Intelliflow pump
    Pentair SWG
    using BBB for pool chemistry/Lamotte ColorQ tester for daily testing

  2. Back To Top    #2
    JasonLion's Avatar
    Join Date
    May 2007
    Location
    Silver Spring, MD
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    37,887

    Re: Cloudy wahter and a bit of green sand (bottom)

    With CYA around 80 and a SWG, you want your FC level to be at least 4, certainly not as low as 2.

    You didn't really shock the pool, you just raised the FC level for a while. Given that you only just barely had algae that might be enough, but to really shock you need to raise FC to 21 and hold it there until you don't have any FC loss overnight.

    Any sand on the bottom should be vacuumed up. Debris on the bottom provides a place where algae can get started.

    It is alright to swim any time the FC level is below shock level.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

  3. Back To Top    #3

    Re: Cloudy wahter and a bit of green sand (bottom)

    Quote Originally Posted by JasonLion
    It is alright to swim any time the FC level is below shock level.
    My Shock level is 21 as you said, so are saying that I could swim in the pool when the FC = 20?

    Isn't it to high (FC = 20) to swim?
    Don
    SW Florida
    10,000 gal in ground concrete pool
    Pentair Cartridge filter
    Pentair Intelliflow pump
    Pentair SWG
    using BBB for pool chemistry/Lamotte ColorQ tester for daily testing

  4. Back To Top    #4
    reebok's Avatar
    Join Date
    Apr 2009
    Location
    Lakeland, FL
    Posts
    1,268

    Re: Cloudy wahter and a bit of green sand (bottom)

    yes. your own choice. if you don't want to, you don't have to, but some (not all) on the forum do.
    16x32 21,000 gallon in-ground exposed aggregate, 1.5hp pump, 120 sqft catridge filter, birdcage, solar panels, aquavac tigershark qc robot.

  5. Back To Top    #5

    Re: Cloudy wahter and a bit of green sand (bottom)

    Thanks guys for the info

    My FC is back to normal (FC = 4), we got in the pool today

    The thing is : my wather is still fuzzy/cloudy. Is it because I need to filter 7/24 for few days or could it be something else?

    BIC
    Don
    SW Florida
    10,000 gal in ground concrete pool
    Pentair Cartridge filter
    Pentair Intelliflow pump
    Pentair SWG
    using BBB for pool chemistry/Lamotte ColorQ tester for daily testing

  6. Back To Top    #6
    JasonLion's Avatar
    Join Date
    May 2007
    Location
    Silver Spring, MD
    Posts
    37,887

    Re: Cloudy wahter and a bit of green sand (bottom)

    Cloudiness is either dead algae or living algae. Since you never really shocked the pool it is probably living algae, though I suppose it might just be dead algae. You really ought to actually shock the pool.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

  7. Back To Top    #7
    frustratedpoolmom's Avatar
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    May 2007
    Location
    SWSuburban Chicago, IL
    Posts
    11,963

    Re: Cloudy wahter and a bit of green sand (bottom)

    You need to keep your FC level up to shock level and hold it there until:

    You lose 1ppm or less of FC overnight;
    Your CC is .5 or less;
    Your water is clear.

    If you don't meet those three criteria, keep shocking. Shocking once without confirming the algae is dead isn't going to help.
    Helpful links: Pool School; CYA/Chlorine Chart
    24' round AG pool, 52" high, Raypak heater; Waterway 2 spd Pump;
    150 Sq ft. Clearwater Cartridge Filter; Former and DISSATISFIED "Pool Frog" owner
    http://www.PerfectlyClearPoolService.com

  8. Back To Top    #8

    Re: Cloudy wahter and a bit of green sand (bottom)

    Thanks for the info guys.

    As a note: I had FC = 10 early this morning and tonight it was 8. My SWG was off the whole day (I wanted to see how much I would loose during the day). If I had algea, my FC would have gone down a lot more during the day, right?

    BIC
    Don
    SW Florida
    10,000 gal in ground concrete pool
    Pentair Cartridge filter
    Pentair Intelliflow pump
    Pentair SWG
    using BBB for pool chemistry/Lamotte ColorQ tester for daily testing

  9. Back To Top    #9

    Re: Cloudy wahter and a bit of green sand (bottom)

    Good news

    My wather is now crystal clear and I don't have any green little cloud when I shake the little sand spots on the bottom of the pool.

    Thanks for the help again.
    Don
    SW Florida
    10,000 gal in ground concrete pool
    Pentair Cartridge filter
    Pentair Intelliflow pump
    Pentair SWG
    using BBB for pool chemistry/Lamotte ColorQ tester for daily testing

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