So a curious thing for me. Every vacuum head I've ever had for a dozen concrete pools has no brushes. They are specifically sold as concrete vacuum heads. Recently I took over a pool that has a nearly identical style head, except it has two alternating rows of brushes on the bottom. I was under the impression that heads with brushes were for vinyl pools, not painted concrete? This is a typical 8-wheel rectangular head, not any of the triangular or other funny styles I've seen for vinyl.
Is there any advantage/disadvantage to brush/non-brush in relation to a concrete pool?