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Thread: SLAM to kill mustard algae - CYA @100. Drain and reduce CYA?

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    SLAM to kill mustard algae - CYA @100. Drain and reduce CYA?

    I've been battling mustard alage for the past month without success and after reading the articles at TFP, I know why. I picked up the Taylor 2006 kit and tested last night - here were my results:

    CYA - 100 ppm - tested 2x, 2nd time with 1/2 pool, 1/2 tap as recommended by the test kit.
    TA - 90ppm
    CH - 160 ppm
    PH - between 7.2 and 7.4 on the kit.
    FC - between 16 and 17 ppm
    CC - 0

    There was a bit of confusion on the CC test as it was listed *after* the FC test. most of the other tests say explicitly to use the water from the previous test, but this one was unclear - do you start fresh or do you use the water you cleared from the FC test? I did both ways and still came up with 0 (yellow - not pink)

    Pool water is clear, but I haven't brushed it in about a week. I vaccummed to waste last week and the alage has started growing again. I'm certain it is alage and not polen.

    Do I bring the FC up to 39 or should I drain 1/4, fill, drain 1/4, fill until the CYA is much lower? What is cheaper?

    I can get 10-12% Liquid in 2.5 GAL jugs from a store locally and I'm curious as to how much I need to add.

    Thanks for the great site, looking forward to getting the pool clear and "trouble free".
    Approx 18K gal, vinyl, 1HP pump (new as of Aug 2014), Jaccuzi Sand filter (refreshed fall 2013), El-cheapo home depot vaccum head.

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    Mod Squad jblizzle's Avatar
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    Re: SLAM to kill mustard algae - CYA @100. Drain and reduce CYA?

    Welcome to TFP!!!

    The CC test is done with the resulting water from the FC test.

    I would recommend lowering the CYA before you continue the battle.

    Use PoolMath to calculate the dosages for you.

    Please add your pool details to your signature as described HERE as it will help us help you in the future.
    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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    Join Date
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    Re: SLAM to kill mustard algae - CYA @100. Drain and reduce CYA?

    Sorry mate - when I posted the check box for "Show Sig" was unchecked. Fixed

    What is the desired CYA level? There is an automatic chlorinator and pucks are being used.

    I used pool math and found that I need to replace 60% to get down to 40.
    Approx 18K gal, vinyl, 1HP pump (new as of Aug 2014), Jaccuzi Sand filter (refreshed fall 2013), El-cheapo home depot vaccum head.

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    Re: SLAM to kill mustard algae - CYA @100. Drain and reduce CYA?

    I'll start the drain/refil this afternoon.

    My assumption is that I should re-test everything before starting the SLAM - how long after the water replacement is complete should the pool circulate before I test and start the SLAM?
    Approx 18K gal, vinyl, 1HP pump (new as of Aug 2014), Jaccuzi Sand filter (refreshed fall 2013), El-cheapo home depot vaccum head.

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    Administrator Leebo's Avatar
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    Re: SLAM to kill mustard algae - CYA @100. Drain and reduce CYA?

    I'd like to start off by welcoming you to TFP! With a bit of work you'll soon have the sparkling water you see in the photo's on the forum.

    Given your test results, I would suggest draining your water first to achieve a CYA around 40ppm. To do this, drain 1/4 of the water then refill. Continue doing this until your CYA is at your desired level. The ABC's of Pool Water Chemistry contains a good starting point for clearing your pool's water. After that, the video below details how to "Slam you pool."




    Quote Originally Posted by Egor View Post
    There was a bit of confusion on the CC test as it was listed *after* the FC test. most of the other tests say explicitly to use the water from the previous test, but this one was unclear - do you start fresh or do you use the water you cleared from the FC test? I did both ways and still came up with 0 (yellow - not pink)
    To preform this test, use the FAS/DPD test rather than the basic OTO test. This video below shows the test using the TF-100, however the instructions are the same as with the K-2006.

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    Mod Squad jblizzle's Avatar
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    Re: SLAM to kill mustard algae - CYA @100. Drain and reduce CYA?

    The desired CYA is 30-50ppm. Once you are in that range, you can NOT use trichlor tablets any more and must use liquid chlorine.

    Have you discovered Pool School yet? 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
    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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