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Thread: still brushing and shocking black algae - should filters run

  1. #1
    Junior Member
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    still brushing and shocking black algae - should filters run

    Firstly I want to say thanks for this site - the info is enormously useful. I live in Spain and don´t have access to a lot of the kit you mention, anyway....
    I have black algae and have been in the pool with a wire brush rubbing it off. I have shocked the pool and the chlorine level is remaining high which I think is good news. I can´t get at the algae in the deep end of the pool and so I´m now trying to find a scuba kit so that I can get down there and scrub away. This may take a couple of days because I´m in a fairly remote spot (for dive kit anyway). So my question is - should I be running the filters as per normal or not? I´m worried that I´ll just get spores (or whatever) in the pump and they´ll fester there and re-emerge to torture me! Also should I be using algicide at this point in the clean up or is there no point to that?
    Muchas gracias!

  2. #2
    Administrator JasonLion's Avatar
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    Welcome to TFP!

    The key to killing black algae is high chlorine levels and frequent brushing. Brushing several times a day is more important than brushing really throughly. A standard pool brush on a long pole should be sufficient. Another approach is to place a trichlor tablet directly on the black algae and let it sit there for a couple of hours.

    In any case you should leave the pump/filter running. As long as you maintain high chlorine levels the spores won't be able to survive in the water.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    TFP Admin. Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

  3. #3
    Senior Member The Mermaid Queen's Avatar
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    Welcome to TFP!

    18x32 grecian IG vinyl; ~23000 gallons; 250# sand filter, Hayward superpump with AO Smith motor 1HP SF1.0; booster pump for polaris. Handy Links: Jason's Calculator, TF-100 Test Kit, Pool School, CYA-Chlorine Chart
    "Shock" is a process, not a product!

  4. #4
    Mod Squad Butterfly's Avatar
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    Welcome to the forum, poolqueen
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    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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  5. #5
    Junior Member
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    Thanks for your help, chaps.

    I have been over every square inch of the pool now and there is not one scrap of black algae left. I´ve shocked again and am running the filters...so it´s looking good. What are the chances of my remaining algae free after this?

    Also I noticed little holes where I ´d knocked the algae off and I´m wondering are they bad news? (I´m presuming they´re not good, anyway!) - could they be the cause of future water leaks? Can I get down there in my scuba gear and squirt some bathroom silicone on to them....is that a good idea?

    Cheers
    Poolqueen

  6. #6
    Administrator JasonLion's Avatar
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    Black algae can come back sometimes. It is very difficult to kill it completely. It burrows into the plaster where some small part of it can hide from the chlorine. I would do an extra day at high/mustard algae shock levels to have the maximum chance of getting rid of it.

    I have never heard of black algae causing leaks.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    TFP Admin. Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

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