Other than just brushing, it is always good to get in the water with goggles and a brush and look in every crack and crevice for algae. When I was fighting it I found it underneath the steps of my ladder, in the seam where the main drain connects to the pool bottom and in the seam around my light where it mounts to the wall.
In each case, it was not visible but upon running a brush through these tight spots I was shocked at what I found.
In each case, it was not visible but upon running a brush through these tight spots I was shocked at what I found.