Lightweight: 700g filter balls are equivalent to 25kg of filter sand. Lighter and more efficient than traditional filter media. Durable and energy efficient: Filter balls can be washed and reused and have a long service life. Since winding is no longer required, you save energy, costs and other swimming pool accessories. POWERFUL: With high dirt holding capacity, it can filter residues of 3 to 5 microns. Tight design, high water permeability, lighter, more efficient, with excellent filtering and environmental performance. Universal use: As a swimming pool cleaner, our filter balls can be used almost universally on any filter system. The use of flocculants is not recommended as they cause the filter balls to clump. Product information: Weight: 700g/box, Size: Ball diameter 50mm, Material: Fiber polyester, Color: White< /p>