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Thread: Can algae be gone after one treatment?

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    Can algae be gone after one treatment?

    I was so proud of myself this year. Stayed on top of things and never had a green pool to deal with. Well yesterday I pull back the cover to take a water sample and see some green around the steps in the deep end and around the light. Not bad but I need to take care of it. Pull the cover completely off, give it a thorough brushing then run my tests and determine where my shock level is. I shock it and then 30 minutes later check pH. It's high, so I bring that down. Keep testing and all is good and water clears up nicely.

    Before bed I test the chlorine, and then first thing this morning before work. It's at the same level. Is it possible to be done with shocking after just one day/night? It seems to me that it should take longer.

    Thanks in advance.
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    Mod Squad tim5055's Avatar
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    Re: Can algae be gone after one treatment?

    What are you testing with and what were the numbers?
    TFP Moderator 39 X 18 23,000(ish) freeform gunite; built 2007ish; Pentair Triton II TR100 600lb Sand filter; 2 HP Pentair pump with 2.2 HP AO Smith single speed motor; 2 skimmers, 1 main drain, 4 returns w/waterfall, Stenner 45MHP2 3GPD running@ 60% - 15 gal Tank; heated by the sun CYA 200+ when I started - 50 now. Dolphin Supreme M5 Pool Cleaner. Hot Springs SX Spa, 285 gallon

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    Richard320's Avatar
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    Re: Can algae be gone after one treatment?

    If you caught things early enough, it's possible to kill the algae in a few hours. Typically it takes a couple days to ensure it's all dead and gone. Remember there are three criteria to meet simultaneously before ending the SLAM process.
    1) The water is clear. That means immediately after brushing, too. And clear means seeing all the way to the bottom. Minimum is being able to see a quarter tossed in the deep end. Ideal is being able to call heads or tails.
    2) Overight loss is 1 FC or less
    3) CC is .5 or less.

    So far, all you have for sure is the overnight loss test passing. What about the other two?
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    Re: Can algae be gone after one treatment?

    Quote Originally Posted by tim5055 View Post
    What are you testing with and what were the numbers?
    Testing with the TF-100. FC was at 5 before everything, pH at 7.4. CYA was 35, so I figure a shock level of 14. Went a little overboard with the bleach and after the FC was testing around 20 last night. Kept pH at 7.4 after adding MA after bleach. FC tested around 20 this morning. pH at 7.4.
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    Mod Squad tim5055's Avatar
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    Re: Can algae be gone after one treatment?

    As Richard asked, what is the CC level and do you see any algae - is the water clear?
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    Re: Can algae be gone after one treatment?

    Did you run the pool overnight?

    The pH is not reliable when the FC is above 10. Next time measure the pH when the FC is below 10.

    When you said the FC was around 20 last night and around 20 this morning gives me some "doubt" in your numbers. Usually if the OCLT passes, the water is clear, and CC is less than or equal to .5 I would say you are done, but in your case I would do it again tonight. Make sure the pool runs overnight.
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    Re: Can algae be gone after one treatment?

    Quote Originally Posted by ping View Post
    Did you run the pool overnight?

    The pH is not reliable when the FC is above 10. Next time measure the pH when the FC is below 10.

    When you said the FC was around 20 last night and around 20 this morning gives me some "doubt" in your numbers. Usually if the OCLT passes, the water is clear, and CC is less than or equal to .5 I would say you are done, but in your case I would do it again tonight. Make sure the pool runs overnight.
    The pool is running 24/7. I measured the pH before raising to shock level since I thought I had read the pH rises at shock level. The water is clear right now.

    So I think I might be confused and I hope you can bear with me here. The chlorine test I am doing is in the TF-100 test kit where I fill the vial to the 10mL mark, drop the powder in and count the # of drops it takes to turn clear. I had always thought of this as the FC test, but is this really the CC test? I hate to sound like a newbie here but I want to make sure I am doing this right and passing along the correct information.

    Thanks again for your help and patience with me.
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    Re: Can algae be gone after one treatment?

    Quote Originally Posted by odonekanobe View Post
    The pool is running 24/7. I measured the pH before raising to shock level since I thought I had read the pH rises at shock level. The water is clear right now.

    So I think I might be confused and I hope you can bear with me here. The chlorine test I am doing is in the TF-100 test kit where I fill the vial to the 10mL mark, drop the powder in and count the # of drops it takes to turn clear. I had always thought of this as the FC test, but is this really the CC test? I hate to sound like a newbie here but I want to make sure I am doing this right and passing along the correct information.

    Thanks again for your help and patience with me.
    Ok in my searching I just found this. I have never done it and I will now as soon as I get home.

    1) Do your FC test with the R-0870 DPD Powder as you normally would, adding R-0871 to bring the solution clear, as normal.
    2) Add 5 drops of R-0003 (Yellow cap) to the solution. Swirl to mix.
    3) If the solution remains clear, your CC level is 0.
    4) If the solution turns pink, add R-0871 again, counting drops as you do for the FC test. Each drop is .5ppm, just like FC
    5) A CC reading of 1 (2 drops) or above is cause for concern, come talk to your friendly TFP folks and read Pool School.
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    Texas Splash's Avatar
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    Re: Can algae be gone after one treatment?

    Right, your earlier post (powder & drops divide by 2 = FC)... that WAS for free chlorine. This last post you just did is performed right after the FC test to determine the CC (combined chlorine). Are you good now?
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    Re: Can algae be gone after one treatment?

    Quote Originally Posted by Texas Splash View Post
    Right, your earlier post (powder & drops divide by 2 = FC)... that WAS for free chlorine. This last post you just did is performed right after the FC test to determine the CC (combined chlorine). Are you good now?
    Well I thought I had it clear before, but yes I believe I am clear now. Tonight I will do a FC test before bed. Tomorrow morning I will also FC. If it is 1 FC or less from what I recorded the night before, I will test CC by adding 5 drops of R-0003 and then if not clear add R-0871 until clear. Each drop is 0.5 like in FC. If it is basically more than 1 drop to clear then I need to continue SLAM. Sound about right?

    So do I even bother checking pH while in SLAM? I thought anything above 7.5 pH made the chlorine ineffective?

    Thanks again.
    18,000 Gallon Plaster IG Kidney w/ 400 Gallon Spa.
    Tagelus Sand Filter w/ Jandy Series One Gas Furnace.
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    Re: Can algae be gone after one treatment?

    Make sure you brush at least once a day. Algae forms a protective bioshield and brushing opens them up to be killed by the FC. You have a plaster pool so you need to use a metal algae brush. Also, make sure that your cover is algae free, too.
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    Texas Splash's Avatar
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    Re: Can algae be gone after one treatment?

    So do I even bother checking pH while in SLAM?
    Usually no because the higher FC levels skews the pH reading. During a SLAM, focus on the FC the most, followed by CC. What we usually recommend is focus on the FC and water clarity each day. Since the CC test is done immediately after the FC test, you can do that as well. When the FC begins to hold better thorough the day, and CC starts to show as zero or less than 0.5 ppm with very clear water, then you can worry about doing the overnight (OCLT) test. The OCLT is like the final report card of the SLAM - usually.
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    Re: Can algae be gone after one treatment?

    Quote Originally Posted by kcindc View Post
    Make sure you brush at least once a day. Algae forms a protective bioshield and brushing opens them up to be killed by the FC. You have a plaster pool so you need to use a metal algae brush. Also, make sure that your cover is algae free, too.
    Thank you. I have just been trying to find some info on how to clean it effectively. One person said bleach, another said algaecide? after it is initially treated, I read on here that one member recommends dunking his cover frequently so that the treated water will treat the cover also. And then possibly running my FC levels at 1.5x what is listed on the chart to accommodate the increased need with the solar cover?
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    Mod Squad YippeeSkippy's Avatar
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    Re: Can algae be gone after one treatment?

    Just FYI- algaecide prevents algae, but it doesn't really do squat to get rid of it if its already present.
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    Re: Can algae be gone after one treatment?

    Quote Originally Posted by YippeeSkippy View Post
    Just FYI- algaecide prevents algae, but it doesn't really do squat to get rid of it if its already present.
    Do you have any suggestions? Bleach it?
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    Re: Can algae be gone after one treatment?

    Quote Originally Posted by odonekanobe View Post
    Do you have any suggestions? Bleach it?
    Yup, that's what I'd do! Bleach is what will kill algae spores.

    I would lay the cover out on the driveway and wash it down with a 10% bleach solution and use a push broom to disrupt any biofilm that may be built up. Let it dry in the sun, turn it over and do the same to the other side.
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    Re: Can algae be gone after one treatment?

    Quote Originally Posted by YippeeSkippy View Post
    Yup, that's what I'd do! Bleach is what will kill algae spores.

    I would lay the cover out on the driveway and wash it down with a 10% bleach solution and use a push broom to disrupt any biofilm that may be built up. Let it dry in the sun, turn it over and do the same to the other side.
    I will do that. Thank you for the help.
    18,000 Gallon Plaster IG Kidney w/ 400 Gallon Spa.
    Tagelus Sand Filter w/ Jandy Series One Gas Furnace.
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