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Thread: Algae Question?

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    Algae Question?

    I have the following readings with the tf100.

    FC kept above 7
    TA = 85
    CYA = 70
    CC = 0

    I run the pump for 3 or 4 hrs a day and most of the day weekends. Not a major outbreak but I have Algae still gathering in streaks in the crevices and dents in the liner around alot of the pool in a 24 hr period. I get direct sun.

    My question is, is this to be expected even with keeping the FC level above minimum, I have been vaccumming the Algae up on a daily basis. Do I need to shock or is this normal considering my situation.
    13500 Gallon / BBB Method / TF100
    Pentair SD40 sand filter / 1.5hp Dynamo
    AG / Full Sun / Small Fountain
    Eastern NC, Moderate Rain

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    frustratedpoolmom's Avatar
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    Re: Algae Question?

    If you aren't experiencing an overnight FC loss, that's probably just dust/dirt/pollen. Is it growing on walls?
    Helpful links: Pool School; CYA/Chlorine Chart
    24' round AG pool, 52" high, Raypak heater; Waterway 2 spd Pump;
    150 Sq ft. Clearwater Cartridge Filter; Former and DISSATISFIED "Pool Frog" owner
    http://www.PerfectlyClearPoolService.com

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    Mod Squad Bama Rambler's Avatar
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    Re: Algae Question?

    Of course FPM is right. Do a FC overnite drop test. When I do mine I use the 25ml fill and multiply the drops by .2. That way you have an accurate measurement of just how much the FC drops. Be sure to get your samples after the sun is off the pool and before the sun is back on it the next morning.

    We have tons of dirt in ours so I do a drop test every couple of weeks.
    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

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    Re: Algae Question?

    FPM, I don't have any on the walls but have actually dived down with goggles and taken a look it appeared to have a dirt but also a strange consistency I thought may be algae although you may be right about it being dirt only since it is gathering in the crevices which would make since.

    Thanks for the replies...........
    13500 Gallon / BBB Method / TF100
    Pentair SD40 sand filter / 1.5hp Dynamo
    AG / Full Sun / Small Fountain
    Eastern NC, Moderate Rain

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    Re: Algae Question?

    I would suggest increasing your pump run time to about 8 hours daily. It may not be the primary reason your algae/dirt is appearing but it may well be a contributing factor.

    With a CYA of 70, Your daily FC loss should be around 2-3ppm at most. The overnight FC loss test will confirm if you have organics (and I suspect you do).

    We are in identical (almost) climates. I would back off just a little on the CYA to 50-60 and hold the chlorine where it is at around 7+ppm.

    Regardless if it's dirt or algae, I believe those changes will tweak your pool a little and get you on track for cleaner, clearer water.

    How are you chlorinating?

    What's your pH and TA?
    Dave S. - Forum owner
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Re: Algae Question?

    Duraleigh, thanks for the advice. My TA is 85 and PH is 7.5. I have direct sun on my pool all day, do you think I would still benefit from reducing my CYA, I know the chlorine would be more effective at 50-60. I try to run the pump when I get home and turn it off when settling in for the night, prob not ideal runtime.
    13500 Gallon / BBB Method / TF100
    Pentair SD40 sand filter / 1.5hp Dynamo
    AG / Full Sun / Small Fountain
    Eastern NC, Moderate Rain

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    frustratedpoolmom's Avatar
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    Re: Algae Question?

    I would agree with Dave, and I didn't even notice the pump run time on your OP. Probably not enough time. Is the pool covered during the day? If not, you should run your pump for a few hours during the day, maybe get a timer that runs 4 hours daytime and 4 hours nightime....
    Helpful links: Pool School; CYA/Chlorine Chart
    24' round AG pool, 52" high, Raypak heater; Waterway 2 spd Pump;
    150 Sq ft. Clearwater Cartridge Filter; Former and DISSATISFIED "Pool Frog" owner
    http://www.PerfectlyClearPoolService.com

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    Re: Algae Question?

    maybe get a timer that runs 4 hours daytime and 4 hours nightime....
    Yeah, that's a nice mix. I really believe 8 hours daily, split into two sessions would help the overall cleanliness of your pool and perhaps get more of that algae gone. Sorry I missed your TA earlier.....your pH is, of course, ideal.

    It's your call on the CYA. We may be splitting hairs a little, but I think you could have a better pool with a little less CYA (and subsequentlyu a little less FC) and some more filtering.
    Dave S. - Forum owner
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Re: Algae Question?

    Timer sounds like a great idea, I will also try to reduce CYA first chance. Thanks for the help.........
    13500 Gallon / BBB Method / TF100
    Pentair SD40 sand filter / 1.5hp Dynamo
    AG / Full Sun / Small Fountain
    Eastern NC, Moderate Rain

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