About Product: Bestway - Filter Media OverviewFlowClear™ Polysphere™ is an innovative pool and spa filtration media designed to replace traditional sand or cartridge filters. Made of high‑density, microfiber spheres, it traps dirt and debris down to microscopic levels while allowing optimal water flow. A 500 g bag of Ø 5 cm Polyspheres treats the same volume as 18 kg of conventional filter sand—delivering superior clarity with far less bulk. Features Ultra‑Fine Filtration– Captures particles as small as 5 µm, out‑performing sand and cartridge media. Lightweight & Space‑Saving– 500 g of Polyspheres equals the filtering power of 18 kg sand, reducing filter load. Recyclable Polyester Construction– Durable, eco‑friendly fibers resist compaction and repel bacterial growth. Chemical‑Free Cleaning– Simply rinse spheres in a bucket of water every 4–6 weeks; no backwashing required. Easy to Install– Fits standard filter tanks and canisters—just pour in, replace lid, and run pump. Long‑Lasting Performance– Polyspheres can be rinsed and reused for up to a year before replacement. Improves Water Balance– Reduces reliance on chlorine and other sanitizers by removing organic contaminants more effectively. Compatible with Most Systems– Ideal for above‑ground pools, small in‑ground pools, hot tubs, and spa filters.