The Pentair Grid Assembly (59023400) is the OEM complete element grid assembly for the Pentair FNS Plus 48 sq. ft. D.E. filter. This is the full internal filtration core — all grids pre-assembled on the top manifold, ready for direct installation. ⚠️ IMPORTANT: THIS IS A COMPLETE KIT — NOT A SINGLE GRID This listing includes the entire grid assembly: 7 full-size grids and 1 partial grid, pre-assembled on the manifold. You are purchasing the complete set, not an individual replacement grid. ⚠️ IMPORTANT: FNS PLUS 48 ONLY — NOT COMPATIBLE WITH FNS 48 This assembly fits the Pentair FNS Plus 48 filter exclusively. It is not compatible with the older Pentair FNS 48 model. Confirm your filter model before ordering. The grid assembly is the filtration core of your FNS Plus D.E. filter. The fabric-coated grids serve as the substrate for diatomaceous earth powder, which captures particles as fine as 2–5 microns. When grids become torn or worn, D.E. powder bypasses the media and returns to the pool — typically visible as a white or grayish cloud in the water. Replacing the complete assembly restores full filtration performance. Specifications Pentair Part Number 59023400 Assembly Dimensions 17-3/4" L × 29-1/2" H × 18" W (internal assembly only — not filter tank dimensions) Filter Surface Area 48 sq. ft. Grid Count 8 grids (7 full-size, 1 partial) — pre-assembled on manifold Quantity Included Each (complete assembly) Fits Into Brand Equipment Line Model / Part Number Notes Pentair FNS Plus Filter — FNS Plus Series FNS PLUS 48 Complete element grid assembly, 48 sq. ft. filter Compatibility is based on Pentair parts documentation and available OEM records. This is not an exhaustive list. For certainty, verify the part number in your equipment's manual or on the original part itself before ordering. Pro Tip When replacing the grid assembly, inspect and replace the filter tank O-ring at the same time to ensure a leak-free seal on reassembly. Also confirm your filter is labeled FNS Plus — not simply FNS — before ordering. The model name is printed on the filter tank label.
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