Hi:
I have recently had what I think was black algae on a shelf surface and my steps. What I found that really helped was I poured some shock granules onto the shelf surface in a small area 4' x 4' with the pool pump shut off and I let that shock sit on the shelf surface for about 15 to 20 minutes. I then used a hand stiff bristle brush and really went to work scrubbing the surface and after some hard scrubbing the surface came clean. Now just how would you do this for the bottom? I can only say that maybe filling a sock with shock and attach to your pool bush and scrub it along the bottom ?
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