Lightweight: 700 g of filter balls correspond to 25 kg of filter sand. Lighter and more efficient than conventional filter media. Durable and energy efficient: Filter balls can be washed and reused and have a long service life. As no more winding is needed, you save energy, costs and other swimming pool accessories. POWERFUL: With a high dirt absorption capacity, it can filter the residues of 3 to 5 microns. Dense design, high water permeability, lighter, more efficient, with excellent filtration and environmental performance. Universal use: As a pool cleaner, our filter balls can be used almost universally on any filtration system. The use of flocculants is not recommended as this leads to clumping of the filter balls. Product information: weight: 700g/box, size: ball diameter 50mm, material: fiber made of polyester, colour: white