Pentair Bottom Grid Locator

The Pentair Bottom Grid Locator (part number 59023400 or 59023400Z) is a specialized internal structural alignment component engineered exclusively for the lower assembly of Pentair FNS Plus and select curved-element Diatomaceous Earth (D.E.) pool and spa filtration systems. Injection-molded from a heavy-walled, high-impact, and chemically inert polymer composite, this slotted template coordinates directly with the bottom manifold of the filter vessel. Its primary structural role is to serve as a stabilizing foundation plate that firmly anchors the bottom tips of the vertical D.E. grid elements, spacing them perfectly in a radial layout to prevent them from rubbing, shifting, or rattling against one another during high-velocity water movement. By enforcing this rigid spacing matrix, the locator prevents hydraulic stress distribution imbalances and ensures the filter core safely withstands surging internal pressures up to 50 PSI without crushing or causing a structural tear in the delicate grid fabric. Designed to remain permanently submerged in a highly dynamic, chemical-laden environment, it completely resists degradation from concentrated chlorine, bromine, salt-chlorine generator outputs, and seasonal acid cleanses. Due to its lightweight, hollowed-out spoke design optimized to maximize internal water space while reducing material mass, this individual grid locator assembly carries a net product and shipping weight of approximately 0.60 to 0.75 pounds (about 9.6 to 12.0 ounces).