Donemore Reusable Pool Filter Balls - Eco-Friendly Pool Sand Filter Balls - Suitable for Swimming Pool Sand Filter, Aquarium Scum and Other Sand Filter System Properties: This product has good water permeability and breathability. Contains harmful substances, does not affect the water quality. and to cleaning. Can be reused, dirt can be washed. Suitable for any agricultural environment (sea water, fresh water may be). It can be used to filter sand and pollutants into swimming pools. Their filtration results are accurate because they can filter particles in pool water to a size of 1.5 microns. The use of filter balls can significantly improve the quality and hygiene of the pool. Excellent microparticle filtration Made of polyethylene and machine washable Delivery content: 100 X filter ball It can be used to filter sand and pollutants into swimming pools. Their filtration results are accurate because they can filter particles in pool water to a size of 1.5 microns. The use of filter balls can significantly improve the quality and hygiene of the pool. Excellent microparticle filtration Donemore Reusable Pool Filter Balls - Eco-Friendly Pool Sand Filter Balls - Suitable for Swimming Pool Sand Filter, Aquarium Scum and Other Sand Filter System Properties: