About this itemFilter balls 800g instead of 29kg filter sand instead of filter sand and filter strainer, lightweight, easy to use, faster filtration speed than conventional filter media.Super durability: the filter balls have a high dirt and dust retention capacity, high water permeability, easier and more efficient filtration.Material specifications: The material is made of 100% polyethylene, diameter 50mm, white, can be machine washed, does not agglomerate, is environmentally friendly, recyclable and can be reused.Cleaning resistance: the filter balls can filter out even the finest 1 micron dirt particles as well as grease, dirt and dirt in the water, making the water in the swimming pool clearer.Area of application: indoor and outdoor pools, filter pumps,.