Pentair 60 SqFt FNS Plus Standpipe Assembly

The Pentair 60 SqFt FNS Plus Standpipe Assembly (part number 59023700 or 59023700Z) is a critical internal plumbing manifold component designed exclusively for the vertical core structure of the maximum-capacity Pentair FNS Plus 60-square-foot Diatomaceous Earth (D.E.) pool and spa filtration system. Injection-molded from thick-walled, high-impact PVC and ABS thermoplastic polymers, this elongated vertical pipe assembly positions itself securely within the center of the pressurized filter tank chassis, connecting the top manifold down to the lower bulkhead. Its primary operational role is to safely channel clean, finely filtered water out of the D.E. grid array and route it back out through the lower bulkhead fitting toward the pool return lines under continuous operating pressures up to 50 PSI without fluid bypass or flow bottlenecks. Built to endure constant submersion in highly chlorinated pool water, abrasive media friction, and intense backwash flow reversals, its robust plastic architecture completely resists structural warping, cracking, and mechanical fatigue over decades of constant service. Due to its thick-walled, elongated configuration engineered to manage high-velocity commercial and residential flow rates, this individual 60-square-foot standpipe assembly carries a net product and shipping weight of approximately 1.50 to 1.75 pounds (about 24 to 28 ounces).