This bundle includes the Watts BBH-150 Big Bubba 40-inch filter housing with 2" Flange and Watts BBC-150-ACP Big Bubba activated carbon block filter (5-micron) cartridge. The Big Bubba Filter Housing is a glass-reinforced polypropylene housing that is made to be durable and long-lasting. Thanks to its heavy-duty non-metallic construction, the Big Bubba is able to withstand both seawater and high pressure applications. The system does use proprietary cartridges that are designed to be both easy to install and designed to handle high-flow situations.