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Thread: Dirt or Algae?

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    Dirt or Algae?

    I've searched this forum but couldn't come to any conclusions on the following. My pool has accumulated some dirt like debris in certain areas. They brush away easily but eventually return in the same spots. This debris is more concentrated by the return jets so part of me thinks this may be a filtration issue. Another part of me, however, thinks this may be a yellow/mustard algae issue. Right not I'm trying to decide whether to open up the filter housing to look for any cracks or issues that would allow debris to get pack into the pool or shock the pool to mustard algae levels. I have attached pictures. My numbers are as follows. Any thoughts and suggestions would be much appreciated. Thanks.

    FC: 9
    CC: 0
    pH: 7.8
    TA: 70
    CH: 340
    CYA: 70
    Temp:76F
    Attached Images Attached Images
    11,500 gallon outdoor in-ground plaster pool; Hayward Northstar 1.5hp pump; Autopilot DIG-220 SWG system; Hayward Clearswim 2025 Cartridge Filter, Polaris 380 cleaner.

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    Mod Squad woodyp's Avatar
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    Re: Dirt or Algae?

    All I can say is that it's been a WICKED pollen season in Texas. I did the "mustard algae" shock thing back in the day before I wised up. I would only suspect mustard if it's in the shady areas of the pool only. And that mostly look like plain old dirt to me.
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    Mod Squad jblizzle's Avatar
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    Re: Dirt or Algae?

    Well, that is either dirt/pollen or dead algae ... certainly does not look living.

    I would suggest that you Perform the Overnight Chlorine Loss Test as see what that tells you.
    Jason, TFP Moderator
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    Re: Dirt or Algae?

    Thanks for the responses. I'll do the OCLT tonight and tomorrow morning and see how it goes.
    11,500 gallon outdoor in-ground plaster pool; Hayward Northstar 1.5hp pump; Autopilot DIG-220 SWG system; Hayward Clearswim 2025 Cartridge Filter, Polaris 380 cleaner.

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    Casey's Avatar
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    Re: Dirt or Algae?

    Looks like dirt but the OCLT will surely rat it out if it's algae!
    I'd bet you my bikini you'll never get TFP water from a pool store!

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    Smykowski's Avatar
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    Re: Dirt or Algae?

    Any algae hiding on a solar cover?
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    Re: Dirt or Algae?

    Thanks to the suggestions and comments, I'm now pretty convinced it is dirt/pollen. The OCLT test results did not budge and remained the same at both checks. So it's either wind blown debris or filter issue. I may put a clean white sock on one of the returns to see if there is any dirt accumulation before thinking about checking inside of filter housing.

    I have no solar covers so can't check there, but OCLT seemed pretty convincing.
    11,500 gallon outdoor in-ground plaster pool; Hayward Northstar 1.5hp pump; Autopilot DIG-220 SWG system; Hayward Clearswim 2025 Cartridge Filter, Polaris 380 cleaner.

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