Pleated Sediment Cartridge 20″ x 4.5″ 50 Micron Suit: 20″ Big Blue These sediment cartridges are constructed from polypropylene, spun & melted simultaneously. This means, no centre core to restrict performance. Compatible with most liquids & highly effective for sediment, rust, sand, silt, & algae removal. These have no chemical residuals. High performance, carry a heavy load before replacement. We use these sediment filters over other types due to the performance, high flow rate, high load capacity, and their inability to grow bacterial slime.