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A RO PP Spun Filter (Reverse Osmosis Polypropylene Spun Filter) is a type of pre-filter used in reverse osmosis water purification systems. It is made from high-quality polypropylene fibers that are spun together to form a dense, multi-layered structure. The primary purpose of this filter is to remove sediment, dirt, rust, sand, and other suspended particles from the water before it enters the RO membrane.