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Thread: Algae....How do you know if you have it?

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    Join Date
    Jun 2013
    Southeast Pennsylvania

    Algae....How do you know if you have it?

    I've been posting the last week here and in some of those posts some folks are saying I may have algae. How do you know if you have algae?? What does it look like? Is the clarity of the water any indication?? My water is crystal clear and I can't see any signs of algae, but I don't know what it looks like.
    13,500 Gallon Gunite Aggregate Finish, DE, SWG, 2.0 HP pump, 1.0 HP pump for 3 Sheer Descents

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    northrn's Avatar
    Join Date
    May 2014
    Cincinnati, OH

    Re: Algae....How do you know if you have it?

    27' AG 18K Gallons ~ Cartridge Filter ~ Pentair 1.5 HP Pump

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    BoDarville's Avatar
    Join Date
    Jun 2012
    DFW, Texas

    Re: Algae....How do you know if you have it?

    One sign that you may have algae, even if it is not yet visible, is when you experience a sudden loss of chlorine. Just keep in mind that this can be caused by other organic contaminants besides algae. Left unchecked, algae will eventually make itself visible - usually the water will first get cloudy for no other apparent reason before it makes itself more visible in the classic way . Green algae is the most common kind with black and mustard algae being less common. If you suspect you have algae, but it is not yet visible, you may want to check behind the pool light and around ladders as these provide good hiding spots for algae.

    Check out our algae articles for more info:
    1. Defeating Algae
    2. Black Algae
    3. Mustard Algae
    Gold Supporter, TFP Lifetime Supporter, 26,680 gal Plaster IGP 3.5 - 10' depth / Attached Waterfall Spa, Manually Chlorinated, Triton Sand Filter, 1.5 HP * 1.1 SF = 1.65 SFHP 1-speed Pentair WhisperFlo WF-26 Pump, 400K BTU NG Teledyne Laars Series One Heater, Polaris 360, Test Kit Comparison, Chlorine/CYA Chart, SLAMing Your Pool, OCLT
    A good test kit is an investment, not an expense.

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    Divin Dave's Avatar
    Join Date
    Oct 2013
    Longview, Texas

    Re: Algae....How do you know if you have it?

    Hi dubele,
    I believe I was one of those that suggested you may have alage, even though your water is clear.
    Algae is a single cell plant which is so small you can't see it without magnification and it multiplies quickly.
    Not until is had multiplied to the extent that your water becomes cloudy or turns green do most people realize they have it.

    Classic initial signs that you have algae are
    1. Your pressure on the filter rises somewhat quickly
    2. You cannot keep FC in the pool

    To determine if your pool has orgainics/ algae
    perform an overnight chlorine loss test so as to remove sunlight burn off from the FC loss equation
    If you loose more than 1 ppm FC overnight, then there are organics in the pool which are consuming your FC
    Divin Dave,
    IG Vinyl, 15' x 30', 3 1/2' - 6' deep, Oval, ~15K gal, Intelliclor IC40, Intelliflo VS pump, Clean and Clear 420 Filter, auto-fill-disabled, Retrofit LED Color Light, Dolphin Nautilus Robot, TF100 Test Kit, Taylor K1766 Salt Test Kit, Tftestkit Pressure Gauge. Experience- it's what's learned just after you needed it most !!

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    robdac's Avatar
    Join Date
    Jun 2014
    Weston, FL

    Re: Algae....How do you know if you have it?

    I suspected that I had algae because I was constantly turning up my SWCG to try to maintain free chlorine. The pool was clear throughout. The overnight free chlorine loss test (OCLT) confirmed that something, likely algae, was eating it up. Whatever I had, the SLAM was the answer and took care of the problem. Better to catch it early.
    11K gal IG screened-in plaster pool w/ spa
    pentair 150 cartridge filter, Pentair Intelliflow VS pump,
    Aquarite AQR15 SWG, AquaCal Heatwave Heat Pump, TF-100 test kit

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