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Thread: Green Algae for over 8 weeks

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    Green Algae for over 8 weeks

    mis amigos,

    I should have found this site a year ago when I got a house with a pool... this is a great site...

    I live in Davie, South Florida and have been maintaining my pool with rookie knowledge for over a year. I was using dichlor powder (rookie mistake) for regular maintencnace. recently, I got hit with green algae which has not ogne away for 8 weeks. I went thru all the basics and algae prevention (Defeating Algae) posts on this website.

    I am using aAqua Chem 6-way test strip and I agree I need to get one of the other sophisticed test kits. Based on the test stirp these are my results:

    Hardness 1000
    Total CL 0
    FC 0
    PH 7.2
    Alkalnity 180
    Stabilizer 150 (This is the max the test can find).

    I took the sample to a pool place and they also could not test CYA > 100.

    So the problem is high CYA, so I drained my pool in half and refilled, the new readings are:

    Hardness 250
    Total CL 0
    FC 0
    PH 7.2
    Alkalnity 120
    Stabilizer 150

    Looks like I have a real issue with CYA. I put in 4x2.5 jugs of 10% chlorine and after an hour the readings are as follows: (Max identifies the max reading the test strip provides)

    Hardness 250
    Total CL 10 (Max)
    FC 10 (max)
    PH 7.8
    Alkalnity 40
    Stabilizer 150 (Max)


    Things I know:

    - My CYA is toooooo high

    Questions I have:

    How do I take control over my pool, some questions I have:

    1. Should I use Aqua Ammonia to kill Algae at this high levels of CYA? What are the disadvantages? One article from Jasoc mentioned the do not recommend this because of 2-reasons. What are those?

    or

    2. Should I drain the pool completely? And refill water, so that I have the CYA in check?

    I can be reached at 786-208-9836.

    Thanks in advance.
    Attached Files Attached Files

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    Mod Squad woodyp's Avatar
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    Re: Green Algae for over 8 weeks

    You're probably not gonna want to hear this since you just drained it halfway.................but I'd dump it again ( the most I absolutely could)..............and start over again. Your cya level is still most likely over 150. Everything is easier to maintain and fix at more normal CYA levels. Plain old bleach will kill your algae and sanitize your water on a regular basis. See shocking your pool and the cya/chlorine charts in pool school. Welcome.
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    Re: Green Algae for over 8 weeks

    At this point, I think you have two priorities. Lower your CYA and get a good test kit.

    The CYA can only be lowered by partial drains/refills or by reverse osmosis. Assuming reverse osmosis is not an option, I would drain about half the water and refill.

    I would also order a tf100 test kit from tftestkits.net.

    While you're waiting for that to arrive, read pool school as often as possible, so you're ready to hit it hard when the test kit arrives.

    No need to put anything into the water other than bleach or liquid chlorine until you're through the shocking process. Your ph looks ok.
    28K, 20' x 40' IG - Vinyl Liner, Hayward DE Filter, 1.5HP Pump, 250K Hayward BTU Heater, Aquabot Breeze 4WD robotic cleaner

  4. Back To Top    #4

    Re: Green Algae for over 8 weeks

    Reading Update 2 hours after pouring 10 gals of chlorine (10%)

    Day

    Hardness 250
    Total CL 10 (MAX)
    FC 10 (MAX)
    PH 7.8
    Alkalnity 120
    Stabilizer 150 (MAX)

    Water looks cloudy.

  5. Back To Top    #5

    Re: Green Algae for over 8 weeks

    I believe that chlorine won't help much. Best answer is to do the drain and refill dance. Not sure how deeply you can drain the pool without damage, local experts may know. Half is safe, alot more than that needs info on pool type. It would be best to try to do it on one step to minimize wasted water.
    Try diluting a sample of pool water with tap water, then test that for CYA. Have one sample 50/50, another 75tap/25pool.
    Sometimes pools with high CYA will find extra CYA shows up after draining, apparently from piping, really unknown. So shoot for a lower CYA, just in case, like 30. After a week our so, when any mystery sources of it have released, you can raise it in measured amounts.
    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.

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    Re: Green Algae for over 8 weeks

    Most important--you need to get a drop based kit. Most of its use TF100, sold by a beloved forum member, or one of the other kits mentioned in Pool School.
    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.

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    Re: Green Algae for over 8 weeks

    Quote Originally Posted by woodyp
    You're probably not gonna want to hear this since you just drained it halfway.................but I'd dump it again ( the most I absolutely could)..............and start over again. Your cya level is still most likely over 150. Everything is easier to maintain and fix at more normal CYA levels. Plain old bleach will kill your algae and sanitize your water on a regular basis. See shocking your pool and the cya/chlorine charts in pool school. Welcome.
    With that high a level of CYA (in excess of 150) you will need to drain as much as possible and refill. If not, you may win this battle, but you will lose the war, so to speak. Unless and until your CYA is under control, you will not have your pool under control. IMHO.

    Good Luck!!!
    14X28 inground Vinyl
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    Butterfly's Avatar
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    Re: Green Algae for over 8 weeks

    Welcome to the forum

    I agree that you need to do the drain/refill dance to lower your CYA and get a good test kit.

    The fav around here, as you prob already know, is the TF100 from http://www.tftestkits.net .

    Time to take control of your pool
    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.

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    Re: Green Algae for over 8 weeks

    I feared that drain & fill may be needed. I took a sample to the pool place again and they did a dilution 2to1 and found that the CYA is still 200. It looks like I have to empty 75% to bring it to 50. My pool size is approx 13,000 gals. Any idea what are the approx water costs in FL? Would $50 be a good estimate?

    At CYA = 200 level is it possible to even get rid of Algae. Here are my readings after 7 hours of putting chlorine. Water looks cloudy (no green)


    Hardness 250
    Total CL 10 (MAX Read)
    FC 10 (MAX Read)
    PH 7.8
    Alkalnity 120
    Stabilizer 150 (MAX Read)

    Also, I see some bubbles adhering to the pool surface closer to the top. Any ideas? Is there a leak or ?

    Thanks again for all th help & advice

  10. Back To Top    #10

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    Re: Green Algae for over 8 weeks

    I don't think I'd waste my money on chlorine until the CYA is under control.
    Garden Leisure Voyager 12x24 AGP, 7500 Gallons, Hayward Power Flo Matrix 1 HP pump, dual speed, Hayward XStream Cartridge Filter, 120 GPM,

  11. Back To Top    #11
    Butterfly's Avatar
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    Re: Green Algae for over 8 weeks

    200 CYA is really unbelievable!
    Info from the PoolCalculator.com = FC maintenance is min 15 to 23ish.
    Regular shock is about 40, and mustard algae shock level is 104!
    Now, as far as I know, we can only test up to 50 FC with the best kit!

    If you could replace about 65% of the water, that might get you to about 70. You could live with that.

    We are all assumming that the 200 CYA test is correct. You really won't know for sure until the drain/refill dance and then retest.

    I fear that you will spend more $ on liquid chlorine/bleach than on the refill water.
    You can call your water company and ask about the fee for about 10K gallons of water.
    Hopefully they will exclude the sewage portion of the bill for a pool fill.

    My Suggestions:
    Okay, time to bite that bullet and:
    1. Order your test kit
    2. Start the drain/refill dance and call the water company
    3. Post back here and we will help you take control of your pool!
    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. ~

    If you found TFP helpful and we saved you money ... Become a TFP Supporter!

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