Pentair Cristal-Flo™ SD70 Standpipe Assembly

The Pentair Cristal-Flo™ SD70 Standpipe Assembly (part number 152227) is a vital internal plumbing backbone engineered specifically for 24-inch Pentair Sand Dollar SD70 and Sta-Rite Cristal-Flo II top-mount pool and spa sand filtration systems. Injection-molded from heavy-walled, high-impact PVC and ABS thermoplastic composites, this rigid center column serves as the primary vertical conduit for water circulation inside the pressurized sand tank. Its critical structural role is to connect the top-mounted multiport backwash control valve directly to the lateral collector hub positioned at the very base of the filter shell, ensuring that high-velocity water is seamlessly transported through the core of the system without disrupting or channeling the surrounding sand bed. Built to withstand continuous internal hydraulic operating pressures up to 50 PSI, forceful backwashing flow reversals, and a relentless downward load from up to 300 pounds of dense silica sand or glass media, this assembly features reinforced joints to prevent cracking or internal pressure bypass leaks. Because it consists of an elongated, robust plastic pipe pre-fitted with heavy-duty connection couplers, the complete center standpipe assembly carries an individual product and shipping weight of approximately 1.95 pounds (about 31.2 ounces).