The Pentair 152228 standpipe assembly is a replacement internal component designed for Sand Dollar SD40 and Sta-Rite Cristal-Flo II 19-inch pool and spa sand filters. This assembly connects the filter’s lateral system to the multiport valve, allowing filtered water to flow from the sand bed to the return plumbing. It restores proper water distribution and ensures efficient filtration performance.

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Key Features

• Replacement standpipe assembly designed for Pentair Sand Dollar SD40 and Sta-Rite Cristal-Flo II 19-inch sand filter systems.
• Central standpipe channels filtered water from the lateral assembly to the multiport valve outlet.
• Includes standpipe, lateral hub, and multiple laterals required for internal filter water distribution.
• Evenly distributes water through the sand bed to maintain efficient filtration and balanced flow cycles.
• Durable molded construction resists water pressure, pool chemicals, and continuous filtration operation.
• Ideal replacement when internal standpipes or laterals become cracked, worn, or clogged inside the filter tank.

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Product Overview

The Pentair 152228 standpipe assembly forms the core of the internal underdrain system in Sand Dollar SD40 and Sta-Rite Cristal-Flo II sand filters. Located in the center of the filter tank, the standpipe connects the bottom lateral hub to the multiport valve, directing filtered water back to the pool circulation system.

This assembly typically includes the central standpipe, the lateral hub, and several laterals that distribute water evenly through the sand media during filtration cycles. Balanced water distribution is essential for effective debris removal and proper filtration pressure. Replacing a damaged standpipe assembly restores proper water flow and helps maintain reliable filtration performance in compatible Pentair sand filter systems.