The Pentair 152229 standpipe assembly is a replacement internal component designed for Sand Dollar SD35 and Sta-Rite Cristal-Flo II 16-inch pool and spa sand filters. This assembly connects the lateral system inside the filter tank to the multiport valve, directing filtered water from the sand bed back to the pool circulation system. It restores proper water distribution and supports efficient filtration performance.

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Key Features

• Replacement standpipe assembly designed for Pentair Sand Dollar SD35 and Sta-Rite Cristal-Flo II 16-inch sand filter systems.
• Central standpipe channels filtered water from the lateral hub to the multiport valve outlet.
• Includes standpipe, lateral hub, and multiple laterals for complete internal filter plumbing replacement.
• Evenly distributes water through the sand bed to maintain balanced filtration and debris removal.
• Durable molded construction resists water pressure, pool chemicals, and continuous filtration cycles.
• Ideal replacement when internal standpipes or laterals become cracked, clogged, or worn inside the filter tank.

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Product Overview

The Pentair 152229 standpipe assembly forms the core of the internal underdrain system in Sand Dollar SD35 and Sta-Rite Cristal-Flo II sand filters. Installed at the center of the filter tank, the standpipe connects the bottom lateral assembly to the multiport valve, allowing filtered water to flow out of the tank and back into the pool circulation system.

This assembly typically includes the central standpipe, lateral hub, and several laterals that distribute incoming water evenly across the sand media. Proper water distribution is critical for effective filtration and preventing sand from returning to the pool. Replacing a worn or damaged standpipe assembly restores efficient water flow and helps maintain reliable filtration performance in compatible Pentair sand filter systems.