The Pentair 170017 Bottom Tank is a genuine replacement component engineered for use with 48 square-foot FNS-Plus diatomaceous earth (D.E.) pool filters. This structural tank forms the lower housing of the filter assembly and supports internal grids and manifolds while directing filtered water back to the pool circulation system. Constructed from durable, corrosion-resistant material, the bottom tank restores proper filter integrity and flow patterns when servicing or rebuilding the filtration unit.

────────────────────────────────────────

Key Features

• Bottom tank replacement specifically designed for 48 sq ft FNS-Plus D.E. filters.
• Forms the lower housing and water chamber for filter operation.
• Durable construction resists corrosion and environmental exposure.
• Precision-molded to ensure proper alignment with FNS-Plus internal grids and manifolds.
• Restores original filter geometry for efficient water flow and filtration.
• Ideal service part for maintenance, repair, or complete filter rebuilds.

────────────────────────────────────────

Product Overview

The Pentair 170017 Bottom Tank serves as the foundational lower housing for 48 square-foot FNS-Plus diatomaceous earth pool filters. Installed beneath the internal grid assembly and manifold system, this component directs incoming water through the D.E. media and into the central return path, enabling thorough particulate removal and clean water circulation. When original bottom tanks become cracked, warped, or compromised due to age, impact, or chemical exposure, performance can diminish and leaks may occur; replacing the bottom tank restores proper filtration dynamics.

Manufactured from robust, pool-grade materials engineered to withstand continuous contact with treated water and sanitizing chemicals, the 170017 bottom tank provides lasting durability in outdoor pool environments. Proper fitment with compatible upper housings, internal grids, and sealing gaskets ensures leak-resistant operation and efficient flow throughout the filter system. This replacement part is suitable for maintenance and rebuild projects that aim to return a 48 sq ft FNS-Plus filter to optimal performance.