It's really easy to keep my own pool clean during the cool winter months. All that I do is dump a cup of chlorine into the water once or twice a week and run the pump every second day (I don't have one of those fancy salt water chlorinators). However, now that the air has warmed up again I'm back to adding chlorine daily and running the pool pump for hours on end.
I wish there were a more energy efficient way to keep pools clean. It often feels like we don't make enough use of the pool to justify it's existence. This mindset however changes quickly when the heat of January an February strikes us in Cape Town. :)