Swimming pool filter balls, filter balls, reusable filter balls. Product specifications: Name: filter ball. Material: polypropylene spherical surface. Applicable object: water. Performance: filtering. White. Ball appearance: round. 700g (filter ball 700g~25kg filter sand). li> Application: 1. Open the sand filter tank. 2. Remove the existing filter material (if in the container) and clean the filter container. 3. Fill the filter balls into the filter tank. 4. Close the filter container. 5. Turn on the machine and start working. Note: The data is purely manual measurement, please allow an error of 1-3 cm: (according to the main picture)