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Thread: Is it Mustard Algae

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    benavidescj's Avatar
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    Is it Mustard Algae

    I recently found a small, quarter sized, brownish looking (almost like dirt) on the first step into my pool. This first step is about 4 inches under water and possibly has bad circulation. I picked it up and it was slimy, brown and almost translucent. I scrubbed it with my 50/50 brush and it was hard to get rid of the stain behind it, but it came off.

    Anyways, I started to get worried so last night I did an overnight FC test and my FC went from 10 down to 7.5 this morning. The water is clear and CC is .5 or less. Is this stuff mustard algae? My current CYA is about 70 and what I don't want to do is spend large amounts of money to achieve mustard algae shock levels when it might be a lesser form that I could kill with regular algae levels.

    Readings:
    FC - 7.5
    CC - .5
    CYA - 70
    CH - 320
    TA - 80
    pH - 7.7
    Salt - 3400
    Borates - 10
    Carlos
    Pool: 28,000 gallons IG; IC 40 SWG; Pentair 120 gpm cartridge filter; Marble finish; Pentair Wisperflow 1.5 hp; Polaris 360
    Spa: 350 gallon; Bromine
    How to shock your pool

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    Join Date
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    Re: Is it Mustard Algae

    In my experience, mustard algae looks like dirt on the side of the pool, greenish brown, and makes a yellow cloud when you brush it. Did you get a cloud when you brushed?

    Found a YouTube video, it's even on his steps.
    http://www.youtube.com/watch?v=wAIodu0TaK0

    Note it comes right off and forms a yellow cloud.
    Built in 1957 44,000 gallon in-ground, Wet Edge Primera Stone in Sky Blue, Intelliflo VF Pump, 600 lb. Pentair Triton II TR-100 Sand Filter, CircuPool RG 60 Plus SWG, TF-100 test kit
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    duraleigh's Avatar
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    Re: Is it Mustard Algae

    Is this stuff mustard algae
    No, I don't think so either. Robbie has described it well. Normally on the walls but the real identifier for me is the greenish-yellow cloud it turns into when you brush it.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Re: Is it Mustard Algae

    Yea, I learned from experience. I'm going to blame it on the previous homeowner neglecting the pool after I signed the contract.
    Built in 1957 44,000 gallon in-ground, Wet Edge Primera Stone in Sky Blue, Intelliflo VF Pump, 600 lb. Pentair Triton II TR-100 Sand Filter, CircuPool RG 60 Plus SWG, TF-100 test kit
    If TFP has helped you, please click to SUPPORT TFP!

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    benavidescj's Avatar
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    Re: Is it Mustard Algae

    I got a cloud but I am pretty sure it was white and I was getting it all the way down the thin strip of pool surface over the step. Pretty sure the cloud was just that the surface, in this hard to reach area, had not been brushed since the pool was built last year. So my plan is to just shock at normal algae levels for my CYA.
    Carlos
    Pool: 28,000 gallons IG; IC 40 SWG; Pentair 120 gpm cartridge filter; Marble finish; Pentair Wisperflow 1.5 hp; Polaris 360
    Spa: 350 gallon; Bromine
    How to shock your pool

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