Pentair 152228 Standpipe & Lateral Assembly – SD40 / 19″ Tank Sand Filters

The Pentair 152228 is a genuine replacement internal piping assembly for 19-inch tank sand filters — including the Pentair Sand Dollar SD40 and compatible Sta‑Rite Cristal‑Flo II filters built after October 2004. It’s the complete standpipe and lateral set needed to restore or rebuild the internal water distribution system inside the filter tank.

Key Features

• Complete replacement assembly — includes standpipe plus hub and laterals required for proper flow distribution and backwashing.
• OEM-grade design — ensures correct spacing and alignment for even filtration and uniform water flow through the sand bed.
• Durable, pool-rated plastic construction — resistant to pool water chemicals and long-term use.
• Direct-fit for SD40 and compatible 19″-tank sand filters — designed for easy replacement without modification.

Specifications

• Manufacturer: Pentair Pool Products
• Part Number: 152228
• Applicable Tanks: 19″-diameter sand filter tanks (e.g. SD40, Cristal-Flo II 19″) manufactured after October 2004
• Includes: Central standpipe, lateral hub, multiple laterals as required for the filter tank
• Material: Pool-rated plastic (PVC / ABS mix) for corrosion and chemical resistance
• Function: Internal water distribution — ensures efficient filtration and backwash performance

When to Replace / Use

Use the 152228 assembly when the existing internal piping shows cracks, collapsed laterals, leaks, or sand return issues. Also use when rebuilding or refurbishing an older SD40 / 19″ filter — replacing internal plumbing restores correct flow and prevents future filter failures.

Installation & Maintenance Tips

• Drain and empty the filter completely before disassembly — remove sand carefully to avoid mess and damage to base or tank.
• Remove old standpipe and laterals; clean out sand and inspect the tank interior before installing new assembly.
• Install the new 152228 unit, ensuring the hub and laterals are properly seated and aligned for correct flow.
• Refill with sand (if required), then backwash and rinse thoroughly to clear out any loose debris before returning to normal operation.
• Inspect laterals periodically (especially after heavy use or backwash cycles) to ensure none are cracked or blocked — replace assembly if needed.

Why It’s Important

Internal piping like the standpipe and laterals are critical for evenly distributing water through the sand media during filtration and backwash cycles. A damaged or degraded assembly can lead to uneven flow, channeling, sand bypass, poor water clarity, and ultimately premature filter failure. The 152228 kit ensures a reliable, OEM-correct internal plumbing system — restoring filter performance and extending system life.