Material of filter balls: 700g swimming pool filter balls for sand filter systems, the new type F7-H polyethylene is used, which is harmless, environmentally friendly and recyclable, filtering deep and harmless to the human body. Cleanliness of the filter balls: Due to the larger surface area of the filter balls for sand filtration systems, their higher activity and adsorption, the filter balls have an excellent effect on the capture fine sand, treatment of dirt and cleaning of the swimming pool. High efficiency and energy saving: filter ball for sand filter systems 700g swimming pool filter balls can replace 25kg sand filters, quartz sand or filter glass of 20 kg, for low weight and cost savings. Long-term stability: filter ball pool for sand filter system fiber filaments floating with water can change the space, not easily blocked by biofilm, have strong chemical stability, do not need to be replaced frequently and can be used continuously. Cleaning pool accessories: whether outdoor pools, water parks, children's pools, aquariums or filter pumps, the swimming pool filtration system The marbles 700g pool filter can bring you a good experience. Specification: Color: White Weight: 700G Diameter: 50 -60 MM Appearance: spherical / elliptical white Filtration rate: 20-50 M/H Sewage collection capacity: 6-10 kg/m Properties: 1. Replace 25KGS and filters, save space and cost 2. High stability, recyclable, environmental protection and energy saving 3. Lightweight, strong adsorption, can remove tiny particles and microorganisms