Pentair FNS Plus Filter Template

The Pentair FNS Plus Filter Grid Template (part number 98725800) is a specialized structural alignment tool engineered for assembling and maintaining vertical grid Diatomaceous Earth (D.E.) filtration networks. This genuine original equipment manufacturer (OEM) part is designed explicitly for the full range of Pentair FNS Plus D.E. filters (models FNSP24, FNSP36, FNSP48, and FNSP60), and it offers backward compatibility with legacy Nautilus and Titan CM D.E. filter lines.

Injection-molded as a flat, lightweight polymer guide, the template measures exactly 11.75 inches in length by 11.75 inches in width, with a nominal thickness of 1/8 inch ($11-3/4" \times 11-3/4" \times 1/8"$). Its primary operational role is to provide a physical layout grid during the rebuild or replacement of internal filter elements. When a technician services the internal grid nest, seven full-sized curved D.E. fabric grids and one partial grid must be set into a perfect radial configuration. Placing this spacing template over the grid fingers securely locks them into uniform positioning, allowing the user to seamlessly align and install the heavy plastic upper manifold and thread the central tie rods without the grid elements shifting, pitching, or collapsing under their own weight.

By facilitating correct internal seating, this template ensures a tight hydraulic seal at the manifold ports, maximizing the functional filtration surface area and preventing unfiltered water or loose D.E. powder from bypassing the core. Made from a durable, chemically inert plastic resin that resists fading and brittleness, this tool carries a nominal net product weight of approximately 0.10 pounds.