The floor of my pool is covered in leaves.

At this stage, vacuuming through the skimmer or using an automatic pool cleaner are very ineffective; both will clog up too quickly. The method of is using a leaf rake attached to a telescopic pole. Slowly push the leaf rake along the floor, scooping up leaves into the bag. Work the pool in sections, trying not to create leaf-stirring currents. It takes practice and a strong back, but it can be very effective.