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Thread: Algae detection?

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    Cool Algae detection?

    My recent shock treatment for recurrence of Algae (May 9) after my first inadequate shock experience was a fantastic success resulting in the cleanest clearest pool I have ever seen.

    Did the OCLT as outlined and all was good.

    Since then I got the CYA up to a bit over 30

    Present tests are:

    FC 4
    CC 0
    PH 7.2
    TA 70
    CH 180
    CYA 34

    BUT

    A few days ago I took out the trichlor Puck cause the FC was getting high and forgot to put it back in for a day. Big rain came and FC got down to 2. Greenish Yellow dust started appearing on floor. I brushed the whole thing and backwashed the filter…then checked the CC again to see if that changed it (stirring up the dust) but it still read 0.

    My Question is: Is there a way to test and determine if this is algae or dirt/dust from roof screen (It is a screened Pool). Like an OCLT test to indicate that there is Algae eating up the Chlorine? I realize that it will become obvious in a day or two if it is back again but if I can determine if it is algae I can start the shock now and get done sooner. It was darker and thicker on the deep end which is the opposite of what I read about Mustard Algae formation symptoms.

    TIA Pool Gurus!
    25,000 Gal In ground
    Ceramic Tiled
    FKAA (Municipal) Water
    Sand Filter
    ! Hp No Name Pump K2006 Test Kit

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    Azgirl71's Avatar
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    Re: Algae detection?

    nevermind. I see your CC IS 0. I am sure someone will be along with an answer. I would say lots of brushingand vacuuming and bring water up to SLAM lever for 24 hours then run a OLCT.
    Lisa
    Intex AG vinyl 15' x 48" 4,300 gallons due to skimmer install, Krystal Clear SF pump combo 2800 GPH, Krystal Clear SWG, Pool Blaster Max vacuum, Hayward thru the wall skimmer, TF 100 test kit with speed stir, K 1766 Taylor salt test, My SLAM Process

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    JasonLion's Avatar
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    Re: Algae detection?

    This is a perfect situation for using the OCLT. If there is algae in the pool it should show up on the test.

    CC almost always stays at zero when you have algae, so that is not a useful indicator.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
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  4. Back To Top    #4

    Re: Algae detection?

    OCLT!

    Right On

    Will do!
    25,000 Gal In ground
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    ! Hp No Name Pump K2006 Test Kit

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    Join Date
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    Re: Algae detection?

    Quote Originally Posted by JasonLion View Post
    This is a perfect situation for using the OCLT. If there is algae in the pool it should show up on the test.

    CC almost always stays at zero when you have algae, so that is not a useful indicator.
    Hi Jason, was just following along this thread and was curious why you say CC almost always stays at zero with algae, isn't that one of the conditions we're testing for when SLAM'ing? My thought was the presence of CC's meant you were killing algae or something, so it should show up as greater than zero, no?

    Thanks, Jeff
    Katy (Houston, TX) - 15,000 gallon In Ground free form kidney shaped 30'x15' pool with Pebble surface. Spa - 8' round with waterfall. Hayward Swimclear Cartridge filter (not sure which model though - maybe C3025?). Pleatco replacement cartridges x 4, 1.5HP Hayward Century Pump, Hayward Booster Pump (model 6060). Chlorine tab dispenser, which I won't be using. Polaris cleaner. TF-100.

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    Mod Squad jblizzle's Avatar
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    Re: Algae detection?

    CC are broken down by the FC and the sun, so you may never actually see high levels. This is why the low CC is not the only criteria and there are 3 separate things that you must pass to know you are down with a SLAM.
    Jason, TFP Moderator
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  7. Back To Top    #7

    Re: Algae detection?

    Strangeness…

    OCLT shows no loss…
    in fact if anything it show FC gain!

    I know that sounds like poor testing but I was especially careful even to the point of using 25ML of water for the FC test and scraping the DPD spoon with a straight edge for accuracy and last night it took 19 drops to clear the water then 20 drops this AM.

    I realize that is probably an irrelevant difference but how can you lose 0 PPM overnight?
    25,000 Gal In ground
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  8. Back To Top    #8
    Mod Squad jblizzle's Avatar
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    Re: Algae detection?

    You can not use too much powder, but too little can cause problems.
    Jason, TFP Moderator
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  9. Back To Top    #9

    Re: Algae detection?

    Quote Originally Posted by jblizzle View Post
    You can not use too much powder, but too little can cause problems.
    Thanks for that.
    Education continues and is cumulative (Thank God, I don't have to remain a dummy) :O)

    So perhaps my testing was faulted? .05 is my usual overnight loss
    25,000 Gal In ground
    Ceramic Tiled
    FKAA (Municipal) Water
    Sand Filter
    ! Hp No Name Pump K2006 Test Kit

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    Richard320's Avatar
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    Re: Algae detection?

    One drop is well within the tolerance of the test. You didn't blow it.
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
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  11. Back To Top    #11

    Re: Algae detection?

    Twilight zone…..

    Yesterday multiple tests showed 4.0 FC

    OCLT was 4 and 4+

    now at 4 PM and after a sunny day in the keys and NO CLORINE ADDITION it is 5.0

    6:15 PM down to 4+
    25,000 Gal In ground
    Ceramic Tiled
    FKAA (Municipal) Water
    Sand Filter
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  12. Back To Top    #12
    Mod Squad jblizzle's Avatar
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    Re: Algae detection?

    What does 4+ mean?

    Clearly this is not possible without adding chlorine.
    Jason, TFP Moderator
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    Azgirl71's Avatar
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    Re: Algae detection?

    I agree with Jason.
    Lisa
    Intex AG vinyl 15' x 48" 4,300 gallons due to skimmer install, Krystal Clear SF pump combo 2800 GPH, Krystal Clear SWG, Pool Blaster Max vacuum, Hayward thru the wall skimmer, TF 100 test kit with speed stir, K 1766 Taylor salt test, My SLAM Process

  14. Back To Top    #14

    Re: Algae detection?

    Well that is certainly the answer I expected.
    That is why I think I am in the twilight zone

    4+ means with a 10cc sample it turned clear with 8 drops but within 30 seconds it got a very pale pink hue so it's 4.5 or less?
    25,000 Gal In ground
    Ceramic Tiled
    FKAA (Municipal) Water
    Sand Filter
    ! Hp No Name Pump K2006 Test Kit

  15. Back To Top    #15
    Mod Squad jblizzle's Avatar
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    Re: Algae detection?

    Once it is clear, you are done and should then proceed to the CC portion of the test. It is normal for the sample to turn back to pink after some time.
    Jason, TFP Moderator
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  16. Back To Top    #16

    Re: Algae detection?

    Ok but I am still left with the ridiculous situation that in 24 hours I am reading 0 chlorine loss with no Chlorine addition.

    I did put in 3 cups of acid about 11 AM to move the PH down a little.

    That is the only thing that went in the pool since yesterday
    25,000 Gal In ground
    Ceramic Tiled
    FKAA (Municipal) Water
    Sand Filter
    ! Hp No Name Pump K2006 Test Kit

  17. Back To Top    #17
    Mod Squad jblizzle's Avatar
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    Re: Algae detection?

    Has to be testing error or somehow chlorine was added to the pool or your water is not well circulated.

    If you used 25ml of water and only 1 level scoop of powder, that may not have been enough powder.

    FYI, the OCLT should typically be performed at FC levels closer to shock level than maintenance level.
    Jason, TFP Moderator
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  18. Back To Top    #18

    Re: Algae detection?

    Oh well I think I better shock cause the color is wrong, it is cloudy still after running the pump all day and there has to be something wrong.

    Just when I thought I had a handle on all this some inexplicable mystery happens.

    Should I go to Mustard shock level or regular….best guess advice :O)
    25,000 Gal In ground
    Ceramic Tiled
    FKAA (Municipal) Water
    Sand Filter
    ! Hp No Name Pump K2006 Test Kit

  19. Back To Top    #19
    Mod Squad jblizzle's Avatar
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    Re: Algae detection?

    Always regular shock level.
    Jason, TFP Moderator
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  20. Back To Top    #20

    Re: Algae detection?

    I have been SLAMming for 5 days now. The overnight FC loss has been 0 since the beginning as has the CC but I keep going because of the Green dust

    Every morning the pool is clear but when I brush there is green dust on the bottom and sides. It is decreasing but the green color makes me think there is still living algae.

    The last (and first) time I SLAMmed it I didn't have a DPD test kit and used WAY too much Chlorine and all the dust turned White, almost Clear in fact.

    I think there is something evil in this pool like black Algae?

    The skimmer leaks so I lower the water below it to save on leakage and the exposed tiles have black areas in the grout.

    Any one gotta thought about this?

    (Am using liquid Chlorine and keeping it around 16 PPM w 40 CYA…PH was 7.2 at start)
    25,000 Gal In ground
    Ceramic Tiled
    FKAA (Municipal) Water
    Sand Filter
    ! Hp No Name Pump K2006 Test Kit

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