Skimming isn't the only maintenance that should be done at least once a week. You also want to get in the habit of brushing the walls and tiles. This helps to minimize the buildup of algae and calcium deposits so they don't fester and become larger problems. The material your pool walls are made of dictates what kind of cleaning tools you should use. For concrete pools, you will want to use a stiff brush, while vinyl and fiberglass pools require a softer brush. You will also want to use a sift brush on tiles so as not to damage the grout or scratch the surface.