New high quality material The filter balls are made of a newly developed material consisting of polyethylene. It is an ultra-lightweight and eco-friendly material with good durability, good water permeability and good drainage, as well as good elasticity and polymerizability, it is a kind of ideal filter material. .Significant filter effect Are lighter and more efficient than conventional filter media. Filter sand can usually only filter about 40 microns of material, and our new generation of filter balls for sand filtration systems can filter 1 micron of material, and the filtration speed is 3-4 times that of conventional filter media. .Environmentally friendly and durable The alternative to filter sand and filter glass, 500 g replaces 18 kg of filter sand, easy handling thanks to its low weight, less backwashing is required with the most dirt absorption leve of each individual filter ball. Reusable many times to save energy, recyclable does not harm the environment. .Universally applicable The individual diameter of the pool filter balls is 50-60mm and the total weight is 500g. The filter balls are universally used in various sand filter systems, do not clog sand filter systems and are also suitable for dirty water. Can filter not only for swimming pools, but also for aquariums, ponds, etc. .Excellent service If you are not satisfied with the filter balls or do not know how to use the filter balls, please feel free to contact us. We will immediately deal with all questions regarding filter beads for sand filter systems for you. .