Watts - BBC-150-D - Big-Bubba Melt-Blown Polypropylene Depth CartridgeWatts Big Bubba Series BBC 150 D Melt Blown Polypropylene Depth Cartridge Depth filtration engineered for gelatinous sediment and chemically aggressive water applications Melt Blown Polypropylene Depth Filtration Chemical Resistant WHY IT WORKS Built for Difficult Sediment Depth Filtration Melt blown polypropylene construction traps sediment throughout the entire cartridge thickness, not just the surface, for higher dirt holding capacity and longer