It says in pool school to brush weekly. What exactly does brushing do, and why is it important?
How hard should you brush? I notice that when the brush is going across the bottom it is pressing pretty hard against the bottom surface because of my downward pressure, but when I am brushing against the sides, in order to get a similar pressure against the surface I have to pull back towards me in addition to pressing down. Is this greater pressure important, or does it work to just run the brush gently over the sides of the pool?