Bobbin Sand Filter

Sand filters are widely used in water purification and remove suspended matter by a completely different mechanism. Instead of the water passing through small orifices through which particles cannot pass, it runs through a bed of filter medium, typically 0.75 mm sand 750 mm deep.The two types of rapid sand filter are the gravity type (e.g. Paterson's filter) and pressure type (e.g. Candy's filter). A disinfection system (typically using chlorine or ozone) is commonly used following filtration.Good pool filter sand can come in three common types that are designed to effectively trap dirt and debris to keep the pool water clean, including silica, zeolite, and glass sand. Silica pool filter sand is the most commonly used type.