High-quality material: the pool filter balls are made of 100% recyclable polyethylene, so are more durable and can be recycled due to the special feature of the material. Recyclable does not pollute the environment. Filter balls diameter: 50 mm to 60 mm, weight 700 g, can replace 25 kg filter sandIdeal replacement for filtration: Since the inner structure of the filter balls is finer than that of the filter sand, it can filter out even finer substances. Filter sand can generally only filter about 40 m of material, and our new generation of filter balls for sand filter systems can filter out 1 m of material, and the filter effect is 3-4 times as high as conventional filter media. These filter balls offer a first-class alternative to classic filter sand or filter glassReusable: Our filter balls for pool have a high pollutant holding capacity and are very durable. The lightweight 700 g filter balls reduce the pressure of the filter pump and thus extend the life of the filter system. With proper care and handling, the swimming pool filter balls for pool pump can last several seasons. Thanks to the intensive pool care, flocculants are also saved. It is an environmentally friendly and durable filter mediumWide range of applications: as a swimming pool cleaner, it is suitable for all sand filter systems. Whether it is a swimming pool in the garden or an aquarium, a filter pump, a fish box, a filter bucket, etc. Can effectively filter out finely suspended solids and improve water quality, bring a clean and clear water quality effect!High-quality service: our top priority is to ensure your satisfaction. If you are not satisfied with the filter balls or do not know the use of the filter balls, please feel free to contact us. We will process all questions about filter balls for sand filter systems immediately for you.Size: Ball diameter: 50 mmWeight: 700 gMaterial: 100% polyethyleneBall appearance: white, round700 g instead of 25 kg filter sandUse:1: Remove the filter sand (if the filter system contains sand).2: Clean the sand particles that could get stuck in the lower sides of the underbody.3: Fill the tank to 2/3 with filter balls. 700 g filter balls correspond to 25 kg of sand.4: Replace the control valve or water tank cap, rinse the new medium for 2 minutes and then rinse back for 2 minutes.5: Switch to filter mode.Content:1 pack of filter balls (700 g)