Features: It is light in weight and high in strength. It is and can help you clean the pool. Instructions: Open the filter container of the sand filter system. Remove the existing filter material (if it is in the container) and clean the filter container. Fill the filter container with a filter ball. Close the filter container. Turn on the machine and start working. weight: 500g Material: Polyester colour: white Package Contents: 1 x Pool Filter Ball Set Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.