swimming pool sand filter
A swimming pool sand filter represents a fundamental component in pool maintenance systems, utilizing natural sand as a highly effective filtration medium. The system operates by forcing pool water through layers of specially graded sand, which captures debris, algae, and other contaminants as small as 20-40 microns. The filtration process begins as water enters through the filter's top, passing through the sand bed where particles are trapped, and clean water returns to the pool through the bottom. This mechanical filtration system employs a multiport valve that controls various functions including filtration, backwashing, and rinsing. Modern sand filters are constructed with durable materials like fiberglass or polyethylene, ensuring longevity and resistance to chemical corrosion. The filter's internal lateral system ensures even water distribution, maximizing filtration efficiency and extending the cleaning cycles. Most residential sand filters range from 16 to 24 inches in diameter, capable of handling pools up to 25,000 gallons. The system requires minimal maintenance, typically needing sand replacement only every 5-7 years, making it a cost-effective solution for pool owners.