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Thread: Dirt/Dead Algae - Shock?

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    Dirt/Dead Algae - Shock?

    Test results:

    FC: 3
    CC: 0.5
    pH: Between 7.5 and 7.8
    CYA: 50 or 60
    TA: 80

    The water is clear, but I am constantly having to brush up/vacuum "dirt", which I now suspect is dead algae, from the pool floor. I get everything "clean" and it's back the next day. It collects mostly in the seams of the pool liner and the center of the pool. Do I need to shock the pool? I did the overnight loss test a few weeks ago (this has been going on for awhile) and it was a 1, which is why I didn't move forward with shocking, but now I think I might need to... I've had a little trouble keeping the chlorine up, but I wasn't sure if that was because my CYA level drifted to the low end and/or the pool is in full sun (and 90+ degree weather). Advice appreciated! Thanks!
    12 ft x 30 in Easy Set Pool on a 20 ft x 20 ft Concrete Pad

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    techguy's Avatar
    Join Date
    Jul 2010
    Antelope, CA

    Re: Dirt/Dead Algae - Shock?

    If you are measuring a solid 0.5CC and your FC is 3 and your CYA is closer to 60, you are too low on your FC and on the edge of a bloom.

    Time to SLAM that pool. Then adjust your minimum FC up to avoid the green.
    -- Guy --
    10K gallons in 21' Round 52 inch wall Aqualeader AG, Hayward Power Flow LX 1.5 HP pump motor, Hayward Perflex EC50AC DE filter w/Cellulose, Wide mouth skimmer, 2013 new Diver Dan (craigslist) to replace the faded old Hayward AquaBug. TF-100

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    Mod Squad woodyp's Avatar
    Join Date
    Apr 2010
    East Texas

    Re: Dirt/Dead Algae - Shock?

    You're ust barely staying in front of the algae. SLAM it!
    16x32x52" Steel Cornelius Miramar AGP Vinyl liner 13,100 gal. Buried 2 ft.
    2 Speed Hayward Power-Flo Matrix 85 g.p.m. 22" 250lb. sand filter hard plumbed
    Pool Rover Jr., Pool Blaster Max, Diver Dave TF100 Test Kit/Speed Stir
    Margaritaville Frozen Concoction Maker, Liqour Chiller, & Drink Mixer & Party Tub----Collect 'um all!

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    Re: Dirt/Dead Algae - Shock?

    I just turned on the pump, added all of the bleach and brushed it really good. My question now, though, is how will I know when I'm "done"? My previous overnight loss was only 1, my CC is 0.5 and the water is already clear. Should my overnight loss and CC be lower when it is "done"? Thanks again!
    12 ft x 30 in Easy Set Pool on a 20 ft x 20 ft Concrete Pad

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