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Thread: can you have algae with no CC and FC available?

  1. Back To Top    #1

    Join Date
    Oct 2007
    Location
    Central Texas
    Posts
    104

    can you have algae with no CC and FC available?

    I have some green spots on the lights and drain covers which scrub off. Looks like algae but I have no CC. FC is available. Is it possible to have algae with no CC?

    FC 3.0
    CC 0.0
    pH 7.4
    TA 60
    CYA 30
    CH 960

    PH rise is a constant problem but I do have a large water feature that aerates.
    Light grey plaster, stone coping, 38K gallon Roman shaped pool with a shallow end beach, table and bar stools, deep end bench and waterfall (Intelliflo 4X160). Taylor K-2006, Pentair 320 chlorinator, Intelliflow VF, Quad DE 100. 4 ColorLogics, 3 skimmers, 14 wall returns, 13 floor returns, TurboTwister slide, autofill and miles of pvc.

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    svenpup's Avatar
    Join Date
    Nov 2009
    Location
    Sacramento, CA
    Posts
    835

    Re: can you have algae with no CC and FC available?

    Yes. You should do an overnight chloine loss test (you have to turn off the liquidator to do this). If you lose more than 1ppm of FC overnight than you should shock.
    TFP Method Advanced Intermediate
    • 17,500 gallons - In Ground - Plaster - Hayward Swimclear 3020 Cartridge Filter - Sta-Rite Max-E-Glas Main Pump upgraded with A.O. Smith B2980 E-Plus New Centurion Two-Speed Motor - Polaris 280 Cleaner with Polaris PB4-60 Booster Pump - TightWatt2 Timer - Taylor K-2006 Test Kit - Pool Pilot Digital Nano SWCG

    Helpful Links: Pool School, BBB for Beginners, How to Shock (hint...it's a process not a product), Chlorine/CYA Chart, Jason's Pool Calculator

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

    Re: can you have algae with no CC and FC available?

    If there are areas of poor circulation then algae can form there, but the places you describe shouldn't have poor circulation -- especially not the drain cover assuming the drain is working (are you sure it's working?). There could have been some biofilms formed there at some point that take higher chlorine levels to get rid of so shocking and brushing are the right prescription at this point and then see if it comes back again after you get < 1 ppm FC overnight loss and let the FC drop back down to normal levels.

    You might also check behind the light in the light niche for algae and check under any removable ladders as well.
    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

    Join Date
    Oct 2007
    Location
    Central Texas
    Posts
    104

    Re: can you have algae with no CC and FC available?

    I will definitely shock - I have only done it once and that was over a year ago. I have four lights and four drain covers so removing them all would be a chore.
    Light grey plaster, stone coping, 38K gallon Roman shaped pool with a shallow end beach, table and bar stools, deep end bench and waterfall (Intelliflo 4X160). Taylor K-2006, Pentair 320 chlorinator, Intelliflow VF, Quad DE 100. 4 ColorLogics, 3 skimmers, 14 wall returns, 13 floor returns, TurboTwister slide, autofill and miles of pvc.

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