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Thread: Alge Problem

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    Alge Problem

    Hello everyone,

    I have a 24 foot AG with an Aquatrol SWG. The water has been crystal clear and the generator is reading 3300 ppm. I test the water on a daily basis for TA, PH, CYA and FC, the test are within the normal range. I began to notice some brown lines around the bottom of the pool, which I was sure was dirt from the kids going in and out of pool. I've been vacuuming the pool every morning for the past week and the same brown lines keep appearing. I've come to the conclusion that these brown lines are Alge since they keep coming back. I took water sample to Leslies pool and these were the results..

    FAC - 4
    TAC - 4
    PH - 7.4
    TA - 90
    CYA - 30
    Calcium - 40
    Phosphates - 2500

    The guy at the pool said that the alge was reappearing because of the high phosphate levels. Can anyone help me with this. Thank you.
    24 foot 52" deep AG Esther Williams Aluminum 13,500 Gal
    1 1/2 HP Hayward Matrix
    Dream line 175 lb sand filter
    Aquatrol SWG

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    Mod Squad Bama Rambler's Avatar
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    Re: Alge Problem

    What test kit are you using?
    Also post a set of your own test results.

    Phosphates is the new problem invented by the pool stores to remove more green from your wallet than from your pool. Don't worry about it.

    Your CYA is very low for an swg. It needs to be about 70 ppm.
    What percentage are you running the swg on and how many hours a day are you running it?

    What does the brown stuff feel like if you pick some up?
    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: Alge Problem

    As of now I'm only using a test strip I'm waiting for TF-100 to arrive to get a more accurate reading. My SWG is running 12 hours a day and the percentage is at 40% which keeps the reading between 3200 and 3300. The pool store suggested I buy phosphate free which cost $41, this didn't seem reasonable. I have not felt the brown stuff yet, when I vacum it, it just comes off easily not like green alge which you have to scrub. This is what kept me from thinking it was alge.
    24 foot 52" deep AG Esther Williams Aluminum 13,500 Gal
    1 1/2 HP Hayward Matrix
    Dream line 175 lb sand filter
    Aquatrol SWG

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    Mod Squad Bama Rambler's Avatar
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    Re: Alge Problem

    I'd just keep assuming that it's dirt until the TF-100 arrives and you have the tools to ascertain what it is. Try to pick some of it up and feel it between your fingers.
    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: Alge Problem

    Ok, the only issue is that it keeps coming up even if we dont use the pool the day before. Its all over the bottom of it... I will try to take a picture of it and post. I will keep vacuuming and try to pick some of it up.
    24 foot 52" deep AG Esther Williams Aluminum 13,500 Gal
    1 1/2 HP Hayward Matrix
    Dream line 175 lb sand filter
    Aquatrol SWG

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    Mod Squad Bama Rambler's Avatar
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    Re: Alge Problem

    Without a good test kit we can't really shock because we have no way to test the FC at shock level. You could start shocking now but we'd just be guessing at how much chlorine to add each time.
    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: Alge Problem

    ok,, thank you for your help .. once i get the test kit I will post the test results. I will get the CYA up and go from there. To shock do you suggest a bag of shock or use the super chlorinate option on the SWG.
    24 foot 52" deep AG Esther Williams Aluminum 13,500 Gal
    1 1/2 HP Hayward Matrix
    Dream line 175 lb sand filter
    Aquatrol SWG

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    Re: Alge Problem

    To shock do you suggest a bag of shock or use the super chlorinate option on the SWG.
    Neither. Shock the pool with liquid chlorine. CAREFULLY follow the procedure outlined in "How to Shock your Pool" up in pool school
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Mod Squad Bama Rambler's Avatar
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    Re: Alge Problem

    Also, don't add any more CYA until we see whether you need to shock or not. It's way easier to shock at 30 ppm CYA than it is at 70 ppm CYA.
    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: Alge Problem

    Hello everyone,

    Just received the TF-100 test kit, I have to say i'm impressed on how complete the kit is. I regret not getting the magnetic stirrer. Well these are my results.

    FC-10.5
    CC-0
    TC-10.5
    PH-7.5
    TA-100
    CH-50
    CYA-90

    I'm still getting the same growth of what appears to be a brown alge in the bottom. I noticed when I vacum and brush that it just moves as dirt in water. Thank you in advanced to everyone.
    24 foot 52" deep AG Esther Williams Aluminum 13,500 Gal
    1 1/2 HP Hayward Matrix
    Dream line 175 lb sand filter
    Aquatrol SWG

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    JasonLion's Avatar
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    Re: Alge Problem

    I doubt that there is live algae in the pool, what you are describing sounds much more like dead algae raining down because the FC level isn't quite high enough. The best things is to do an overnight FC loss test to find out if there really is any algae or not.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

  12. Back To Top    #12

    Re: Alge Problem

    Funny you mentioned dead algae, I was going to mention that since thats what it looks like. Didn't think it was since I haven't seen any sign of live algae. So follow the instructions on how to do the overnight loss test and then go from there. Just curious on whats causing this...
    24 foot 52" deep AG Esther Williams Aluminum 13,500 Gal
    1 1/2 HP Hayward Matrix
    Dream line 175 lb sand filter
    Aquatrol SWG

  13. Back To Top    #13

    Re: Alge Problem

    Good morning,,

    Did the overnight FC Loss test and the results were as follow:

    FC reading before was 10.5 after was 8.5. Does this mean that there is live algae in the pool . I saw the same brown areas in the pool but not as many as before. Thank you again in advanced for any help...
    24 foot 52" deep AG Esther Williams Aluminum 13,500 Gal
    1 1/2 HP Hayward Matrix
    Dream line 175 lb sand filter
    Aquatrol SWG

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    Mod Squad Bama Rambler's Avatar
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    Re: Alge Problem

    A loss of 2 ppm means there's algae growing in the pool and consumming FC. You need to raise the FC to shock level and keep it there till you've passed the OCLT. Since you've been keeping the FC up it's not as bad as it could be.
    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

  15. Back To Top    #15

    Re: Alge Problem

    Bama than you... But how do I raise it to shock level? and what is shock level?
    24 foot 52" deep AG Esther Williams Aluminum 13,500 Gal
    1 1/2 HP Hayward Matrix
    Dream line 175 lb sand filter
    Aquatrol SWG

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    Mod Squad Bama Rambler's Avatar
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    Re: Alge Problem

    Follow the advice given in this article. It'll give you the instructions you need. Use the Chlorine/CYA chart to get your shock level and the Pool Calc to figure out how much chlorine to add.
    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

  17. Back To Top    #17

    Re: Alge Problem

    Thanks..
    24 foot 52" deep AG Esther Williams Aluminum 13,500 Gal
    1 1/2 HP Hayward Matrix
    Dream line 175 lb sand filter
    Aquatrol SWG

  18. Back To Top    #18

    Re: Alge Problem

    hello again,,

    I must be a complete idiot because I cant figure out how much chlorine I need to add to my pool. My CYA is 80 and FC is 10. I look at the chart and still cant figure out the amount of liquid chlorine i must add. Do I add a specific amount or do I add little bit at a time,?
    24 foot 52" deep AG Esther Williams Aluminum 13,500 Gal
    1 1/2 HP Hayward Matrix
    Dream line 175 lb sand filter
    Aquatrol SWG

  19. Back To Top    #19

    Re: Alge Problem

    The CYA chart tells you the concentration, ppm, of chlorine you need. Go to the Pool Calculator enter pool size then current FC, then target FC from CYA chart. Select bleach and strength, read result.
    Spend some time with that Calculator, it will be your best friend.Ooo
    23,000 gallon in ground pool with rock waterfall and spillover spa, Aqualink control system, Polaris 380 cleaner, Purex Triton Clean&Clear Plus cartridge filter. Located in The Woodlands, Texas.

    Pool owner since Nov 2008, Trouble Free since April 2009. Happy to help when I can.

  20. Back To Top    #20
    Butterfly's Avatar
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    Re: Alge Problem

    Quote Originally Posted by fajoza45
    hello again,,

    I must be a complete idiot because I cant figure out how much chlorine I need to add to my pool. My CYA is 80 and FC is 10. I look at the chart and still cant figure out the amount of liquid chlorine i must add. Do I add a specific amount or do I add little bit at a time,?
    We'll help you figure it out.

    Go to http://www.PoolCalculator.Com and use it to compute your doses each time for any chemical.

    First add the pool size in gallons in top left corner.

    Then do FC. In the NOW column enter what your FC level is NOW, which is 10, and in the TARGET column enter your shock level FC , which is 31, based on the CYA/Chlorine chart in Pool School.

    If you tell us the # of gallons in your pool, we can confirm your calculations with you.
    TFP Moderator TF100 Test Kit TF100 TestKit YouTube Channel PoolMath
    You're done SLAMing when:
    1)You lose 1ppm or less FC overnight, & 2)You have .5ppm CC's or less, & 3)your water is clear.

    ~ One should not use a sledge hammer to swat a mosquito. ~

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