Note: We focus on quality of life for many years and use great material. It is a great choice for you and your family. 700 Filter Ball For Sand Filter System-Environmentally Friendly Alternative-Reusable Pool Cleaner-Alternative To Sand FilterFeatures:Filter ball material: The filter ball of the sand filter system is made of specially treated polyester fiber, which is more durable, reusable and environmentally friendly. Filter ball diameter: 50 mm to 60 mm.Replacement of filter sand: filter ball is an ideal substitute for filter sand and filter glass. 700 g replaces about 25 kg of filter sand, which is light in weight and easy to operate.Sustainable and energy-saving: the filter ball can be cleaned and reused. Save energy, costs and other swimming accessories.High-efficiency filtration: The fiber filter ball can even filter out the smallest dirt particles up to 1.5 micron, and can also filter fat in the water Wide application range: The white filter ball is generally used in various sand filter systems, and also suitable for salt water. Filters for swimming pools, aquariums, ponds, etc.This product has good water permeability and breathability.Contains 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, fresh water may be).The package contains:1x1000g filter cotton Home Decoration,Cotton ball