Features:1. FIBER POOL FILTER BALLS: Compared with the traditional filter material, this product has good elastic effect, no floating surface, large gap and long working period. The fiber ball has a stronger adsorption capacity, and the floc effect is better when the oily sewage is degreased. Dense design, high water permeability, more efficient, excellent filtration.2. ALTERNATIVE TO SAND: They are a substitute for heavy and inflexible filter sand, they are also much lightweight than other filter media, the filter balls are easy to handle and have a high collection capacity. Thanks to the long service life of the filter balls, you save money and energy.3. MORE PRACTICAL: In general, filter balls are more efficient than traditional sand-based filter media. The filter capacity of 700g filter balls corresponds to a sandbag of 25 kg. In addition, their filtering is more precise as they can filter particles as small as 1.5 microns in pool water. 4. LONGER LIFE SPAN: With proper care and handling, the swimming pool balls can last for several seasons. These reusable filter balls are machine wash friendly and you can clean them whenever needed. Perfect replacement for your pool filtration sand filter.5. SCOPE OF APPLICATION: Pool, swimming pool, filter pump, aquarium, etc. Notice:Actual color may be slightly different from the image due to different monitor and light effect. Please allow 1-3cm deviation due to manual measurement. Material: polyester fiber, modified fiberSize: 25MM/30MM/40MM/50MM/80MMColor/Style: As the picture shownWeight: 500/700/1400g