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Thread: When can I start treating metal stains after BA?

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    When can I start treating metal stains after BA?

    I have been treating black algae now for a little over a week. Everything looks great. There are still a few spots that are hanging around but they aren't noticable except to me. The FC is holding and water is very clear. I am keeping FC from 16-20ppm for another week then plan to hold it at about 10ppm for awhile. The BBB method worked wonders for the black algae that we have struggled to get rid of in the past.

    Now I have metal staining is several areas which I assume is from using store bought algaecides. From what I have read I need to use the abscorbic acid to remove these rather easily. But you are supposed to drop FC to 0ppm to do the treatment.

    So my questions are...

    - How long do I need to wait after treating the BA to drop FC to 0ppm without having it come back?
    - Once I have treated with the abscorbic acid, how long before I can get FC back up?
    - How long after Abscorbic acid treatment is it safe to swim?

    Thanks for any advice.

    Brooke
    Plano, TX
    25,000 Gallons, Plaster, DE Filter, No SWG

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    Re: When can I start treating metal stains after BA?

    You mentioned that there are still a few spots here and there that only you can notice. So, once you don't notice any more algae at all in any location and your FC holds its level overnight, that is when you can address your metal staining.
    10K gallon IG gunite with waterfall; Pentair CC320P filter; WhisperFlo 2 HP pump
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    frustratedpoolmom's Avatar
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    Re: When can I start treating metal stains after BA?

    If you want my honest opinion, I would wait until the fall when the temps start to cool - live with the stains for this swim season and deal with them later so you don't risk an algae situation... since you are finally getting this under control.

    Did you confirm they are metal by using Vitamin C on the stain?
    Helpful links: Pool School; CYA/Chlorine Chart
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    Re: When can I start treating metal stains after BA?

    Quote Originally Posted by frustratedpoolmom
    If you want my honest opinion, I would wait until the fall when the temps start to cool - live with the stains for this swim season and deal with them later so you don't risk an algae situation... since you are finally getting this under control.
    That's an even better idea.
    10K gallon IG gunite with waterfall; Pentair CC320P filter; WhisperFlo 2 HP pump
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    Butterfly's Avatar
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    Re: When can I start treating metal stains after BA?

    Quote Originally Posted by 257WbyMag
    Quote Originally Posted by frustratedpoolmom
    If you want my honest opinion, I would wait until the fall when the temps start to cool - live with the stains for this swim season and deal with them later so you don't risk an algae situation... since you are finally getting this under control.
    That's an even better idea.
    Another in agreement
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  6. Back To Top    #6

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    Re: When can I start treating metal stains after BA?

    Well that makes sense. I was worried about having to drop it to 0ppm. Now that it is looking so great I really wanted to tackle those stains, but I guess I can wait . It is already a huge improvement though. Thanks for your advice.
    Plano, TX
    25,000 Gallons, Plaster, DE Filter, No SWG

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    Re: When can I start treating metal stains after BA?

    So what do you recommend I keep the FC levels at until I no longer see black algae? We started at 40ppm and have now dropped down to 20ppm. My CYA is approx = 50. And once I don't see any more black spots should I still keep the FC around 10ppm for a couple more weeks?

    Thanks again.
    Brooke
    Plano, TX
    25,000 Gallons, Plaster, DE Filter, No SWG

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    JasonLion's Avatar
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    Re: When can I start treating metal stains after BA?

    If there is only algae in a couple of spots you can try rubbing it lightly with a trichlor tablet. That will often help it go away quickly.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
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    frustratedpoolmom's Avatar
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    Re: When can I start treating metal stains after BA?

    If you have eliminated signs of the BA but you want to keep it elevated to prevent a repeat, then yes 10 sounds good but keep brushing the affected areas even if you don't see spots.
    Helpful links: Pool School; CYA/Chlorine Chart
    24' round AG pool, 52" high, Raypak heater; Waterway 2 spd Pump;
    150 Sq ft. Clearwater Cartridge Filter; Former and DISSATISFIED "Pool Frog" owner
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