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Thread: Another SLAM question- Algae

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    Another SLAM question- Algae

    I have been SLAMing my 30000 gal pool for the past couple of days to deal with an algae problem. Cya level is 80, so my goal has been to keep FC at 31. Initial CC level was only 0.5. The first night had chlorine loss of only 1.5 ppm, will repeat the test tonight. My problem is, although the clarity of the water is significantly improved, I still see green algae on the walls. I have been brushing daily, but perhaps not enough and may not be getting hard to reach areas. Without sunlight, it is actually very hard to see which areas need it. My questions are:

    1) I have been running my Aquabot the whole time, assuming that would help. Good idea?
    2) Shouldn't all the free chlorine be killing the algae on the walls? Why is it still green?
    3) When this process is done, is it safe to swim when the FC level is still say in the 20s?
    4) I have been resisting the temptation to add an algaecide. Would it help move this process along faster?

    Hoping to swim by the weekend!

    Thanks for your help,
    Jeff
    30,000 gal IG concrete (Diamond-Brite)
    Hayward 1.5 HP Super Pump VS
    Sand filter
    Taylor K-2006 test kit

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    Texas Splash's Avatar
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    Re: Another SLAM question- Algae

    Hello again Jeff. I can't speak for the Aquabot specifically, but certainly keep the pump going 24/7. Yes, the FC will "eventually" kill the algae, but it is working against the sun during the day as well. So hang in there. It is safe to swim up to your SLAM FC level and below as long as the water is not terribly murky. So at an FC of 31, you are good to swim at 31 and below. Algaecide? RESIST the demons! Do not do it. You will be wasting money and it could be counter-productive adding chemicals to the water your pool doesn't need. Run away from the pool store.
    Pat (a.k.a. Texas Splash) ~ My Pool: Viking Fiberglass; 17,888 Gal; Waterway Supreme 2-sp/2-hp pump; Hayward Ctg filter; TF-100 w/ Speed Stir
    Vital Links: POOL SCHOOL, RECOMMENDED LEVELS, RECOMMENDED CHEMICALS, Poolmath Calculator, SLAM, Chlorine/CYA CHART.
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    cowboycasey's Avatar
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    Re: Another SLAM question- Algae

    Brush Brush Brush brushing gets the chlorine to the algea to kill it..

    1. good idea
    2. it will the more you brush, may need to brush 4 to 6 times a day, free workout
    3. as long as the FC is below SLAM you are good to swim
    4. nope, it will not..
    Pool: Intex 16x32 15000 gal, 2 speed 340042, Pentair CC320 Filter, CircuPool SJ45 Salt System, Intermatic PE653RC; Hot Tub: 650 Gal SWG Megachlor
    links: pool school * Recommended-Levels * SLAM * CYA chart * Test kits * How To Post Pictures * Poolmath * OCLT ** Support your website if we helped you :) **

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    Re: Another SLAM question- Algae

    Thanks! I will keep at it.
    30,000 gal IG concrete (Diamond-Brite)
    Hayward 1.5 HP Super Pump VS
    Sand filter
    Taylor K-2006 test kit

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    Re: Another SLAM question- Algae

    Ditto to what the others have said! Keep brushing and say no to the pool stores!


    Lisa P.
    26,000 IG, pebble tec, flagstone, pentair Triton II TR100 sand filter & VS+SVRS 3hp multi-speed pump, Intellichlor IC-40 SWG, Pentair Booster Cleaner, spillover spa, waterfall, Taylor K-2006 testkit
    [It is better to know how to learn, than to know. - Dr. Seuss[/I]

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    Re: Another SLAM question- Algae

    Brushed the heck out of it today and seeing a lot of the grey stuff now but still some green. CC level is now 1.5, which was surprising- I thought that would remain low. Already running out of R-0871 and can't find the stuff anywhere locally.
    30,000 gal IG concrete (Diamond-Brite)
    Hayward 1.5 HP Super Pump VS
    Sand filter
    Taylor K-2006 test kit

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    pabeader's Avatar
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    Re: Another SLAM question- Algae

    TFTestkits.net for all your testing needs!!

    you are using the 10ml test, correct? Remember, you only need enough powder to make the sample turn color. some folks only need 1 scoop.
    Bob - Palm Beach by San Juan Pools. approx 5000 gals., Pentair 320 cartridge filter (all new guts installed by me), Goldline SWG, 'New to me' Kreepy Krauly Sand Shark, Intermec 104 Timer Test kit: TF-100 w/Speed Stir

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    Re: Another SLAM question- Algae

    Quote Originally Posted by pabeader View Post
    TFTestkits.net for all your testing needs!!

    you are using the 10ml test, correct? Remember, you only need enough powder to make the sample turn color. some folks only need 1 scoop.
    Yes, 10 mL from my second test onward!
    30,000 gal IG concrete (Diamond-Brite)
    Hayward 1.5 HP Super Pump VS
    Sand filter
    Taylor K-2006 test kit

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    Re: Another SLAM question- Algae

    Water now appears crystal clear and no sign of green anywhere. However, CC has increased to 2.0, which doesn't make any sense to me. Hoping my new reagent arrives tomorrow to do overnight test.
    30,000 gal IG concrete (Diamond-Brite)
    Hayward 1.5 HP Super Pump VS
    Sand filter
    Taylor K-2006 test kit

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    Re: Another SLAM question- Algae

    Finally got my new reagent yesterday and was able to start testing again. Past three days I have just been adding 2 jugs of chlorine a day without knowing the level. Was happy to see I was still at shock level last night and overnight FC loss was zero. Water is crystal clear and doesn't smell. So happy with the result and a little disgusted to think about what we were swimming in before! Thank you!


    30,000 gal IG concrete (Diamond-Brite)
    Hayward 1.5 HP Super Pump VS
    Sand filter
    Taylor K-2006 test kit

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    Re: Another SLAM question- Algae

    Awesome! What were the CC'a this morning?


    Lisa P.
    26,000 IG, pebble tec, flagstone, pentair Triton II TR100 sand filter & VS+SVRS 3hp multi-speed pump, Intellichlor IC-40 SWG, Pentair Booster Cleaner, spillover spa, waterfall, Taylor K-2006 testkit
    [It is better to know how to learn, than to know. - Dr. Seuss[/I]

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    Re: Another SLAM question- Algae

    Forgot to mention that. 0.5!


    30,000 gal IG concrete (Diamond-Brite)
    Hayward 1.5 HP Super Pump VS
    Sand filter
    Taylor K-2006 test kit

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    Another SLAM question- Algae

    Excellent!!! Sounds like you're a TFP convert!


    Lisa P.
    26,000 IG, pebble tec, flagstone, pentair Triton II TR100 sand filter & VS+SVRS 3hp multi-speed pump, Intellichlor IC-40 SWG, Pentair Booster Cleaner, spillover spa, waterfall, Taylor K-2006 testkit
    [It is better to know how to learn, than to know. - Dr. Seuss[/I]

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    Re: Another SLAM question- Algae

    FC level has been holding around 20 for several days now despite 90 degree weather. Was expecting it to decrease faster. Is that because of the high CYA level?


    30,000 gal IG concrete (Diamond-Brite)
    Hayward 1.5 HP Super Pump VS
    Sand filter
    Taylor K-2006 test kit

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    Texas Splash's Avatar
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    Re: Another SLAM question- Algae

    Towards the end of a SLAM, FC will not have as much active algae to compete with, so that's one way to know when you're winning the battle. And yes, with a higher CYA, it will protect that FC better from the sun and UV rays enabling the FC to last a bit longer. That's good.
    Pat (a.k.a. Texas Splash) ~ My Pool: Viking Fiberglass; 17,888 Gal; Waterway Supreme 2-sp/2-hp pump; Hayward Ctg filter; TF-100 w/ Speed Stir
    Vital Links: POOL SCHOOL, RECOMMENDED LEVELS, RECOMMENDED CHEMICALS, Poolmath Calculator, SLAM, Chlorine/CYA CHART.
    If you enjoyed your TFP experience, please consider donating to Support TFP!

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    Re: Another SLAM question- Algae

    Great news!!


    Lisa P.
    26,000 IG, pebble tec, flagstone, pentair Triton II TR100 sand filter & VS+SVRS 3hp multi-speed pump, Intellichlor IC-40 SWG, Pentair Booster Cleaner, spillover spa, waterfall, Taylor K-2006 testkit
    [It is better to know how to learn, than to know. - Dr. Seuss[/I]

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