type: Swimming pool cleaning equipment Model Number: Pool Filter Balls This product has good water permeability and breathability. Contains no and harmful substances, does not affect the water quality. Durable and resistant to cleaning. Can be reused, dirt can be washed. Suitable for any agricultural environment (sea water, water may be). It can be used to filter sand and pollutants into swimming pools. Their filtration results are more accurate because they can filter particles in pool water to a size of only 1.5 Micrometres. The use of filter balls can significantly improve the quality and of the pool. Next generation filter material for swimming pools replaces sand Excellent microparticle filtration Ball is generation filter material for swimming pools, a perfect substitute for traditional sand. In addition to minimum weight and low weight, the fiber mix ensures excellent microparticle filtration. Unlike sand, it does not harden or clump during use. Easy handling due to low weight. Does not damage or damage seals. Resistant to pool chemicals. Durability guaranteed. Machine wash. Performance: Acid resistance, high temperature resistance, resistance Adsorption rate: 98 (%) Anti-stress: 4 (kgf) Density: 0.1 (g / cm3) Porosity: 86 (%) Wear rate: 1 Hardness: 1 Chemical composition: C Hydrochloric soluble rate: 1 (%) colour:white Material:cotton Size: 40 mm Weight: 200g Package Contents: 4 x bag filter balls Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.