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Thread: Algae inside of light

  1. Back To Top    #1

    Join Date
    Sep 2009
    Location
    Frederick County, MD
    Posts
    175

    Algae inside of light

    Looking for some advice.....

    I have a couple of PAL 2000 lights in my 19,800 gallon Fiberglass pool with a Salt Chlorine generator, one in the shallow end between 2 returns and one in the deep end just a little below the skimmer. The light has a clear lens cover that can be removed and rep;aced with colored ones if I want to change the color of the light. We never do this, but it is on the inside of the removable lens cover that I get some algae buildup.

    This is our 4th year with the pool, and it has only happened the past 2 years. Also, it is only on the lens cover that is in the deep end just below the skimmer.

    I tested water last night and here is what I have.....

    Fc = 7
    Cc = 0
    pH = 7.6
    TA = 70
    CYA = 50
    CH = 190

    So my numbers look reasonable (need to bump CYA and CH just a bit), yet I still get a little algae in the light cover. My guess is that the circulation inside the cover is not too great and maybe I can drill some holes to improve that. But..... how come i do not have algae in both lights?

    I am stumped.
    Jim

    Southern Frederick County, MD - Leisure Moroccan 38 Fiberglass Pool - 19,800 gallons
    Pentair 1.5 hp 2 speed pump - Cartridge filter - Dolphin robot - TF-100 Test Kit - SWCG

  2. Back To Top    #2
    Mod Squad Bama Rambler's Avatar
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    Jun 2009
    Location
    SouthWest Alabama
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    22,331

    Re: Algae inside of light

    It could be that the other light either leaks a little more water into it, and/or the circulation by it is a bit better than other one. One could also see more sun than the other. I'd probably make it a habit to take them out a couple times a year and clean them good.
    Dave J. TFP Moderator
    24' x 52" Round AGP. 2hp/¼hp SPL Power-Flo 2-speed pump. 200sqft Waterway Cartridge Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
    Pool School ----- Pool Math ----- TF-Test Kit

  3. Back To Top    #3

    Join Date
    Sep 2009
    Location
    Frederick County, MD
    Posts
    175

    Re: Algae inside of light

    Sounds good Dave, glad to see that is was not really an error on my part.
    Jim

    Southern Frederick County, MD - Leisure Moroccan 38 Fiberglass Pool - 19,800 gallons
    Pentair 1.5 hp 2 speed pump - Cartridge filter - Dolphin robot - TF-100 Test Kit - SWCG

  4. Back To Top    #4

    Join Date
    Mar 2007
    Location
    San Rafael, CA USA
    Posts
    12,082

    Re: Algae inside of light

    If you were able to completely get them clean, then you might not get any algae spores into them so they would remain algae free. In other words, if the circulation is very poor, then it's less likely for algae in the pool water (which should be minimal given proper chlorine levels) would get into the light and then grow. Also, if the circulation is poor, using a tiny amount of Polyquat 60 algaecide in the light might last a long time since it won't break down so quickly if chlorine isn't present.
    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"

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