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Thread: Algae is not going away

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    Post Algae is not going away

    Opened my pool last week and seem to have a persistent algae problem.

    Have an above ground pool that is 13,500 gallons. No debris on the bottom and water is clear with a slight green tint. I have super shocked the pool and the chlorine is in the high range. Gave the bottom of the pool a good brushing but the green tint is there and the brushing is not making a dent.

    I added some algaecide yesterday and see only the slightest bit improvement. However brushing is not doing anything. I added another dose of algaecide today and am wondering if I am doing anything wrong or am on the right track.

    pool.jpg

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    Mod Squad jblizzle's Avatar
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    Re: Algae is not going away

    Welcome to TFP!

    Algaecides are not very effective at removing algae, more so add insurance to prevent it. You need to follow the SLAM process described in Pool School and that requires one of the recommended test kits and not trusting the testing done at pool stores.
    Jason, TFP Moderator
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    Richard320's Avatar
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    Re: Algae is not going away

    Welcome!

    We can help you clear out that green monster for the last time, but only if you're willing to learn and invest in a proper test kit. I suggest you start reading pool school (button on the upper right of every page) until you feel like

    What you need is a SLAM. That means maintaining a high chlorine level for an extended period of time - not a one-time megadose.

    Here's a couple visuals that compare the pool store shock method with our SLAM method.

    shock.gif slam3.gif

    In reality, the second one will stay blue the whole season, but it's pretty boring that way.
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
    Troublefree does not mean Maintenancefree. It's like brushing your teeth: You can spend a couple minutes a day and pennies a week or go to the dentist once a year and spend several thousand dollars.
    A pool is like a pet - you have to feed it every day, even the days you don't want to play with it!

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    Re: Algae is not going away

    Thanks for the quick replies. I won't be able to purchase the better water testing kit until at least next week but feel comfortable with the SLAM process otherwise. I added a lot of shock to the pool after opening it and will now begin a regime with some bleach so I can kill off this algae. Will keep you posted should I need more guidance.

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    Mod Squad jblizzle's Avatar
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    Re: Algae is not going away

    What is your CYA level? Without knowing it you have no idea what FC level you need to reach.

    What "shock" are you using? It could be adding more stabilizer and making your problems worse.

    How much Pool School have you read? Start with these:
    ABCs of Water Chemistry
    Recommended Pool Chemicals
    How to Chlorinate Your Pool
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
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    Re: Algae is not going away

    Thanks again, I have read those sections of pool school over too. For shock I had used the Power Powder Plus. In total over the course of a week I have likely put in about 10 lbs. I also have two floaters in the pool each with 3 chlorine tabs.

    I have not put in any CYA as of yet and for testing have only used some Strips that I had. I took the water to be tested at Leslie's but the person told me that since my chlorine was so high it was throwing off all the other readings as false positives.

    The water went from a dark green were I could not see the bottom. Yesterday it looked like a giant glass of mountain dew and today is more of a blue/green and I can see through to the bottom. Have the green tint from the algae on the bottom/walls. Scrubbing has not removed any of this yet. Today I am starting to see some small spots at the bottom were the algae has disappeared.

    Since I can't get proper self testing kit that is suggested until next week and can't count on Leslie's to give me a good reading, I am kind of flying blind, which I suppose is not good. Since progress is being made though I was thinking of just getting 4-6 gallons of good bleach to just put in the pool and see if that helps loosen this algae while I wait on getting the proper testing materials.

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    Mod Squad jblizzle's Avatar
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    Re: Algae is not going away

    The PPP shock is cal-hypo so that is adding a lot of calcium to your pool and also may contribute to clouding the water.
    Every tablet you use is adding 2.5ppm of CYA to your pool and lowering the pH. So you CYA is not zero and could be very high if you have been using a lot of tablets for a long time.

    We never recommend blindly adding chemicals. We recommend testing your FC level and using PoolMath to determine how much you should add to reach a certain goal.

    Without a CYA number, you have no FC goal so no idea how much bleach to even add. For reference, one 121oz bottle of 8.25% bleach will add about 5.9ppm of FC to your pool, but again, no idea how many you need to add until you have test numbers.
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
    500 sqft Heliocol solar panels, ThePoolCleaner, TF-100 test kit w/ SpeedStir
    Pool School + Test Kit + PoolMath = A TROUBLE FREE POOL
    If you found TFP helpful and we saved you money ... Become a TFP Supporter!

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