sand filter for pool
A sand filter for pool is an essential filtration system that effectively removes debris, dirt, and contaminants from pool water through a process called mechanical filtration. This sophisticated system utilizes specially graded sand as a filter medium, typically containing silica sand with particles sized between 0.45 and 0.55 millimeters. As pool water flows through the sand bed, particles as small as 20 microns are trapped, resulting in crystal-clear water. The system operates through a multiport valve that controls various functions including filtration, backwashing, and rinse cycles. During normal filtration, water enters through the top of the tank, passes through the sand bed where contaminants are captured, and clean water returns to the pool through the bottom collection system. When the filter becomes dirty, a simple backwash process reverses the water flow, flushing trapped debris to waste. Modern sand filters are constructed with durable materials like fiberglass-reinforced polyester or thermoplastic, ensuring longevity and reliability. These filters typically require minimal maintenance, with sand replacement needed only every 5-7 years, making them a cost-effective solution for pool maintenance.