When the temperature drops, you should start to prepare your pool for freezing weather conditions. The appropriate methods of defending your pool against freezing will vary depending on your location. Your local pool distributor can provide specific information on winterizing your pool for your area. Cleaning the pool before closing, will make opening it in the spring easier. Follow your regular maintenance, including vacuuming the pool, scrubbing the walls, and checking the filter and pump. After vacuuming the pool, you should conduct a chemical test and add a winter form of algaecide and sanitizer. You may want to drain the water below the skimmer, then cover the pool. Don't forget the pool equipment! Any pool hardware that holds water needs to be drained and have the plugs removed. This includes pumps, filters, heaters, and other tanks. After you drain the equipment, remember to turn off all switches and timers related to the equipment. Additional information on defending your pool against freezing can be obtained from your area pool professional.