Environmentally friendly and durable: The filter balls for sand filter systems are made of specially treated polyethylene, so they are more durable and can be recycled due to the special nature of the material. Powerful: Fast filtration, strong adsorption capacity, long Lifespan and easy operation. It can capture tiny suspended particles that cannot be easily precipitated and removed, and make the swimming pool cleaner. Wide range of applications: These filter balls are suitable for filtration of swimming pools and aquariums. It can also replace the filter sand. It is suitable for filtration of filters, filter barrels, pool etc., which can effectively filter out fine suspended matter and improve water quality. Suitable for all sand filter systems. Long service life: Unlike sand, the pool filter ball does not block your filter and requires less backwashing for maintenance purposes. Lighter, more comfortable and more efficient than traditional sand filters, perfect alternative to sand filter sand, filter glass and other glass media. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-dadangjia