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Thread: Was it dust, or yellow algae?

  1. Back To Top    #1

    Was it dust, or yellow algae?

    I just finished a total drain and refill here in Phoenix. After a week I have everything balanced out, the CYA up to 50, pH is 7.6, and water is crystal clear. However, when the pool was totally empty and dry, I washed down the walls of the left over "dust" that I was having a hard time vacuuming/brushing out of the pool previous. I was convinced I had a lot of desert dust settled in my pool the last few months, but now I'm thinking it might have been yellow algae. When it was dried out and swept up into a pile in the bottom of the pool, it looked like a light brown and VERY fine powder, almost talcum powder in consistency. Since it was hard to brush up and vacuum (it tended to stick to the PebbleTec), I'm now thinking it may have been yellow algae instead of dust.

    Thoughts? I wish I had kept a sample. Maybe it could be tested somehow.
    15K gal, PebbleTec, 1/2 HP StayRite pump, Hayward S360SX Pro Series 36in. sand filter, A&A In-Floor Cleaning System (generation 1), connected spa.

  2. Back To Top    #2

    Join Date
    Jul 2013
    Mesa, Arizona

    Re: Was it dust, or yellow algae?

    Hi, APD....I'm in Mesa. I'm no expert on yellow algae, but we certainly have no shortage of dust fines that resemble what you described.......I've been pulling up what you described in my pool cleaner all week.....
    Mesa, AZ Spillover spa and inground pool, 12,500 G, pebble finish, Hayward C5030 (525sf) Cartridge Filter, Hayward EcoStar VS Pump, Installed July 2013, Hayward SWG T-Cell-15, Trident UV (I know, I know....was installed before I found this site!) Rock grotto waterfall, LED ColorLogic lighting, 110 BTU Heat Pro Electric Heat Pump, Maytronics Dolphin Supreme M5 cleaner, TF-100 test kit with Speed Stir.

  3. Back To Top    #3

    Join Date
    Mar 2007
    San Rafael, CA USA

    Re: Was it dust, or yellow algae?

    Yellow/mustard algae prefers shade so if the dust was mostly on the shady side of the pool then it could have been that algae, otherwise it's more likely to be pollen or similar colored dust. Yellow/mustard algae can hang out behind light niches and under removable ladders. If you instead use a skimmer sock and collect this yellow substance there, then it's less likely to be algae.
    16,000 gallon outdoor in-ground 16'x32' plaster pool; Pentair Intelliflo VF pump; Pentair IntelliTouch i9+3s control system; Jandy CL-340 square foot cartridge filter
    12 Fafco solar panels; Purex Triton PowerMax 250 natural gas heater (200,000 BTU/hr output); automatic electric pool safety cover; 4-wheel pressure-side "The Pool Cleaner"

  4. Back To Top    #4

    Re: Was it dust, or yellow algae?

    Okay, since my pool gets mostly full sun, and the "dust" was widespread, I guess it wasn't yellow algae. There was a lot of it that wasn't getting picked up by the vacuum however, and even though I brushed a lot it wasn't going down the main drain.
    15K gal, PebbleTec, 1/2 HP StayRite pump, Hayward S360SX Pro Series 36in. sand filter, A&A In-Floor Cleaning System (generation 1), connected spa.

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