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By certification 
The filter ball is made of polyester fiber and is suitable for filtering materials. Compared with the filter ball, the filter ball has the advantages of high filtration accuracy, good elasticity, and can be backwashed.
1. Swimming pool water treatment
2. Industrial water treatment
3. Aquarium water treatment
4. Hot tub water treatment
5. Rain water treatment
6. Oilfiled water treatment
http://www.poolfilterball.com/
