bleach it. Put it in a bucket with bleach and let it soak for a few hours. Then rinse it well and let it dry out. It should be algea free after the bleach but letting it dry will make sure it's gone.
Letting bleach dry doesn't mean that it is gone. Washing it off very well is about the only way to make sure it's gone. Also prime will neutralize any trace bleach left
Not sure about hair algae but I'm the king of treating driftwood that has BBA. lol Excel works but so does hydrogen peroxide and it's way cheaper.
I just lay the wood on the cement and use a spay bottle until it's dripping off. If it's really bad I may spray it again when it looks like it's drying out. Then I just hose it down and back in the tank it goes. Takes a few days in the tank until the wood looks clean again.
After whatever treatment you decide to use, while it is wet scrub it with a wire brush or a safe scrubby pad, soak again and treat to remove the chemical treatment.
Very few of the pieces of wood I have will stand up to a wire brush.
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