Your pool should have a maintenance schedule determined by pool usage, bather load, climate and surrounding environment. If your pool is highly used things like dirt and oil are just a few of the things that will change water chemistry and contribute to a dirty pool. Warm long summer days can cause algae growth and rainy winters can do the same. A pool positioned near trees can cause skimmers to clog jeopardizing circulation. These are just some things to keep in mind when scheduling your pools maintenance.