With the pack of filter ball, you can filter out the smallest impurities in the water, which will bring your clean and comfortable swimming pool back! Durable material: Made of PE, the water filter has a long life, lighter and more efficient than the traditional filter media.. Reusable design: Being 100% reusable, the swimming pool filter can be cleaned by machine or hands.. Convenient usage: Just pour them onto the machine to start filter, the pool filter balls are easy to use, but bring an efficient result.. Diameter: 50 mm. Less backwash: Compared with the filter balls, these balls require less back wash frequency.. Equals 75 kg pool filter sand. Specifically designed to remove bacteria. Brand Name: vidaXL. Colour: Blue