{"product_id":"pentair-pacfab-fns-plus-replacement-grid-assembly-36-sq-ft-oem-fit-18-1-2l-x-25h-x-18w-direct-swap-d-e-element","title":"Pentair PacFab FNS Plus replacement grid assembly 36 sq ft — OEM-fit 18-1\/2\"L x 25\"H x 18\"W, direct-swap D.E. element","description":"\u003cp\u003e\u003cstrong\u003eThis is a complete grid assembly engineered to replace the original 36-square-foot Pentair PacFab FNS Plus D.E. filter element.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eIf your pool or spa filter uses the Pentair PacFab FNS Plus platform with a 36 sq ft rating, this factory-dimensioned grid assembly restores filtration performance and fits the original tank spacing. The assembly measures 18-1\/2 inches long, 25 inches high, and 18 inches wide to match OEM geometry, making it a direct swap for worn or damaged elements. It’s designed for mechanical compatibility and consistent flow through the D.E. media surface you rely on for fine particulate capture.\u003c\/p\u003e\n\n\u003ch3\u003eWill this grid assembly fit my Pentair FNS Plus 36‑sqft filter?\u003c\/h3\u003e\n\u003cp\u003eYes — the assembly reproduces the original PacFab dimensions and connection points for the 36 sq ft model, so it installs without modification in compatible housings. Confirm your filter model number matches Pentair PacFab FNS Plus 36 sq ft before ordering.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eExact dimensions: 18-1\/2\" L x 25\" H x 18\" W for direct fit.\u003c\/li\u003e\n  \u003cli\u003eBuilt to match Pentair PacFab FNS Plus connection geometry.\u003c\/li\u003e\n  \u003cli\u003eIntended as a like-for-like replacement for 36 sq ft elements.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow does replacing the grid assembly affect pool water quality?\u003c\/h3\u003e\n\u003cp\u003eReplacing a degraded grid assembly restores the filter’s designed surface area and flow paths so the system captures finer debris and maintains consistent hydraulic performance. Fresh grids help the D.E. coating distribute evenly for efficient filtration cycles.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eRe-establishes the full 36 sq ft filtration area for particle capture.\u003c\/li\u003e\n  \u003cli\u003eReduces bypass and channeling that occurs with damaged grids.\u003c\/li\u003e\n  \u003cli\u003eHelps maintain pump pressure and lengthen run times between cleans.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat should I check before installing this replacement grid?\u003c\/h3\u003e\n\u003cp\u003eInspect the filter tank, manifold, and O-rings for wear before installing the new grid assembly. Proper seating and a clean manifold ensure an effective seal and even D.E. distribution when you recharge the filter.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eVerify tank interior is free of corrosion, cracks, or debris.\u003c\/li\u003e\n  \u003cli\u003eReplace worn O-rings and clean manifold openings prior to assembly.\u003c\/li\u003e\n  \u003cli\u003eFollow manufacturer torque and alignment guidance for reassembly.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow long will the grid assembly last and how do I maintain it?\u003c\/h3\u003e\n\u003cp\u003eLifespan depends on pool usage, water chemistry, and cleaning frequency; with regular backwashing and proper D.E. application, a grid assembly can remain serviceable for multiple seasons. Periodic inspection for tears, deformities, or clogging preserves performance and helps determine when a full replacement is required.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eInspect grids annually and after heavy debris events.\u003c\/li\u003e\n  \u003cli\u003eRinse and backwash according to Pentair recommendations during servicing.\u003c\/li\u003e\n  \u003cli\u003eReplace immediately if fabric tears, frame distortion, or severe fouling appears.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for: Pool and spa technicians, homeowners, and maintenance professionals who own or service Pentair PacFab FNS Plus 36 sq ft D.E. filters and need an OEM-dimensioned replacement grid assembly. If your filter’s element shows wear, damage, or loss of filtration efficiency, this assembly restores original sizing and fits for a straightforward reinstall. Confirm your FNS Plus model is the 36-square-foot configuration before purchase, and follow Pentair’s instructions when handling DE media and reassembly.\u003c\/p\u003e\n\u003csection class=\"product-faq-snippet\"\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Is this grid assembly compatible with all FNS Plus models?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: No. This assembly is specifically for the Pentair PacFab FNS Plus 36 sq ft model. Verify your filter’s model and sq ft rating before buying.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Can I install the grid assembly myself?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes, a competent DIYer can install it if they follow Pentair’s reassembly and DE handling instructions; replace O-rings if worn.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"Pentair","offers":[{"title":"Default Title","offer_id":56806008291668,"sku":"B004W4TR1I","price":557.81,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1063\/2652\/4244\/files\/pentair-grid-assembly-front-view.jpg?v=1786811446","url":"https:\/\/gardenluxe.co.uk\/products\/pentair-pacfab-fns-plus-replacement-grid-assembly-36-sq-ft-oem-fit-18-1-2l-x-25h-x-18w-direct-swap-d-e-element","provider":"Gardenluxe Uk","version":"1.0","type":"link"}