the "main drain" of an in ground pool can do this using the pool pump, draining from the bottom using the pump "Waste", main control handle setting. Or, it works to setup a vacuum hose as if vacuuming using the skimmer suction so that the pump draws water from below the skimmer level. The water should be lowered below the skimmer and below the water returns according to the type of pool cover you're using.  If you're using a mesh cover, lower the water 12 to 18 inches (30.5 to 45.7 cm) below the skimmer. If you're using a solid, floating cover, lower the water to 3 to 6 inches (7.6 to 15.2 cm) below the skimmer. All pumps, filters, heaters and chlorinators need to be drained of water before the winter. Remove the skimmer basket(s) and return eyeball(s). (If water were to freeze inside the equipment, it could damage or ruin it.) Open the drains on each piece of equipment to release the water inside. Store the filter elements in a dry place inside for the winter. If it is a DE filter the filter elements can be removed and replaced one by one. The excess DE settled in the bottom may need to be removed by hand -- or there may be a drain plug on the filter, near the bottom.  Or, if it is a sand filter, the sand may need to be cleaned manually and may need to be replaced if it is not cleanable. If the filters cannot be removed, blow carefully with a shop vacuum to help remove the remaining water out of them. An air compressor might build up excessive pressure in the system or damage the system otherwise. The lines running/returning water into your pool need to be dried out so they don't freeze and crack over the winter.   Use a shop vacuum to blow air into the skimmer outlet pipe, through the equipment and back into the pool. If you have more than one skimmer this should be done one by one. Use expansion plugs to plug the lines at the returns and in the skimmer; so water doesn't enter them. Or, if you don't blow out the lines, you can add swimming pool antifreeze (not automotive) to them to prevent remaining water from freezing. Put 1/2 gallon of antifreeze above the plug in the skimmer(s). Put a styrofoam chunk or a plastic bottle in the skimmer as a doughnut to prevent damage to the skimmer from any possible freezing, if rain water or snow-melt drains into it. Follow the manufacturer's instructions.
أخفض سطح الماء باستخدام مضخة. فرغ المعدات من المياه. افتح وفرغ علبة المنقي لتنظيفة تمامًا. أعد السباكة للشتاء.