{"product_id":"pentairgridassemblyforfnsplus3659023500pen59023500","title":"Pentair Grid Assembly for FNS Plus 36 | 59023500","description":"\u003cdiv\u003e\n  \u003ch2\u003ePentair FNS Plus 36 Complete D.E. Grid Assembly (Element Cluster) | 59023500\u003c\/h2\u003e\n\n  \u003cp\u003e\n    The Pentair \u003cstrong\u003e59023500\u003c\/strong\u003e is a factory replacement \u003cstrong\u003ecomplete element grid assembly\u003c\/strong\u003e for\n    \u003cstrong\u003e36 sq. ft.\u003c\/strong\u003e vertical-grid D.E. pool filters. This pre-assembled grid cluster replaces the internal grids and\n    manifold\/collector assembly to restore proper filtration when your existing grids are torn, cracked, warped, or heavily\n    coated with scale and oils that won’t clean out.\n  \u003c\/p\u003e\n\n  \u003ch3\u003eCompatibility\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003e\n\u003cstrong\u003eFits:\u003c\/strong\u003e Pentair \u003cstrong\u003eFNS® Plus 36\u003c\/strong\u003e \/ \u003cstrong\u003eFNSP36\u003c\/strong\u003e vertical grid D.E. filters (where parts diagram specifies 59023500)\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eAlso used on:\u003c\/strong\u003e select \u003cstrong\u003eTitan RPM\u003c\/strong\u003e 36 sq. ft. vertical grid D.E. filters (where parts diagram specifies 59023500)\u003c\/li\u003e\n    \u003cli\u003e\n\u003cem\u003eTip:\u003c\/em\u003e Confirm your filter model and square footage (36 sq. ft.) before ordering—grid assemblies are not interchangeable across sizes.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch3\u003eKey Features\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003e\n\u003cstrong\u003eComplete 36 sq. ft. grid set:\u003c\/strong\u003e replaces the entire internal grid pack for consistent filtration performance.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003ePre-assembled cluster:\u003c\/strong\u003e designed to drop in as a complete assembly (reduces install time vs. replacing individual grids).\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eRestores water clarity:\u003c\/strong\u003e fresh grid fabric helps capture fine debris when properly charged with D.E.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eFixes D.E. blowback symptoms:\u003c\/strong\u003e helps correct D.E. returning to the pool caused by torn grid fabric or broken frames (after confirming the air relief and internal seals are in good condition).\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch3\u003eWhat’s Included\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003e\n\u003cstrong\u003eComplete internal grid assembly\u003c\/strong\u003e for 36 sq. ft. FNS Plus-style filters\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eGrid count:\u003c\/strong\u003e typically \u003cstrong\u003e7 full grids\u003c\/strong\u003e and \u003cstrong\u003e1 partial grid\u003c\/strong\u003e (pre-installed in the cluster)\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eManifold\/collector components\u003c\/strong\u003e and tie rods as supplied with the complete assembly\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch3\u003eSpecifications\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Pentair\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e 59023500\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eFilter Type:\u003c\/strong\u003e D.E. (vertical grid)\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eFiltration Area:\u003c\/strong\u003e 36 sq. ft.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eGrid Height:\u003c\/strong\u003e approx. 18\" (overall installed height varies slightly by assembly\/manifold measurement)\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eQuantity:\u003c\/strong\u003e 1 complete grid assembly (cluster)\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch3\u003eCommon Reasons to Replace\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003eD.E. powder returning to the pool (torn grid fabric, broken grid frame, or damaged manifold)\u003c\/li\u003e\n    \u003cli\u003ePersistent cloudy water even after proper backwash\/cleaning and correct D.E. recharge\u003c\/li\u003e\n    \u003cli\u003eCracked\/brittle grids from age, chemical damage, or freeze conditions\u003c\/li\u003e\n    \u003cli\u003eMajor filter rebuild where you want all-new internal filtration surfaces\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch3\u003eInstallation Notes\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003eShut off the pump, relieve pressure at the air relief, and open the filter per manufacturer procedure.\u003c\/li\u003e\n    \u003cli\u003eRemove the old grid assembly, then clean debris from the tank bottom and inspect the standpipe and sealing surfaces.\u003c\/li\u003e\n    \u003cli\u003eReinstall the new assembly, ensuring it seats fully and aligns correctly before closing the tank.\u003c\/li\u003e\n    \u003cli\u003eAfter restart, \u003cstrong\u003erecharge the filter with the correct amount of D.E.\u003c\/strong\u003e for a 36 sq. ft. filter (follow your filter manual for exact dosing).\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch3\u003eRelated Products\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003e\u003ca href=\"https:\/\/aquapoolsupply.com\/pages\/search-results-page?q=59023500\"\u003eSearch Aqua Pool Supply for 59023500\u003c\/a\u003e\u003c\/li\u003e\n    \u003cli\u003e\u003ca href=\"https:\/\/aquapoolsupply.com\/pages\/search-results-page?q=FNSP36%20parts\"\u003ePentair FNS Plus 36 (FNSP36) replacement parts\u003c\/a\u003e\u003c\/li\u003e\n    \u003cli\u003e\u003ca href=\"https:\/\/aquapoolsupply.com\/pages\/search-results-page?q=DE%20powder\"\u003eD.E. filter powder\u003c\/a\u003e\u003c\/li\u003e\n    \u003cli\u003e\u003ca href=\"https:\/\/aquapoolsupply.com\/pages\/search-results-page?q=filter%20tank%20o-ring%20FNS%20Plus\"\u003eFNS Plus tank O-rings\u003c\/a\u003e\u003c\/li\u003e\n    \u003cli\u003e\u003ca href=\"https:\/\/aquapoolsupply.com\/pages\/search-results-page?q=grid%20cleaner%20DE%20filter\"\u003eD.E. grid cleaner \/ degreaser\u003c\/a\u003e\u003c\/li\u003e\n    \u003cli\u003e\u003ca href=\"https:\/\/aquapoolsupply.com\/pages\/search-results-page?q=silicone%20pool%20lube\"\u003eSilicone lubricant for O-rings (filter-safe)\u003c\/a\u003e\u003c\/li\u003e\n    \u003cli\u003e\u003ca href=\"https:\/\/aquapoolsupply.com\/pages\/search-results-page?q=air%20relief%20assembly%20pentair%20DE%20filter\"\u003eFilter air relief assemblies\u003c\/a\u003e\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch3\u003eMaintenance Tips\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003eBackwash\/clean on schedule and recharge with the correct D.E. amount—running undercharged can reduce clarity and increase grid loading.\u003c\/li\u003e\n    \u003cli\u003eDeep-clean grids periodically (degrease, then descale if needed) to prevent oils and minerals from permanently restricting flow.\u003c\/li\u003e\n    \u003cli\u003eAlways relieve pressure before opening the filter, and inspect the tank O-ring each time you service the unit.\u003c\/li\u003e\n    \u003cli\u003eMaintain balanced water chemistry to reduce scale buildup that shortens grid life and hurts filtration performance.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/div\u003e\n","brand":"Pentair","offers":[{"title":"Default Title","offer_id":46797896614063,"sku":"59023500","price":329.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0734\/6415\/2239\/files\/pentair-grid-assembly-for-fns-plus-36-59023500-grids-4776307.jpg?v=1777068957","url":"https:\/\/freshized.com\/products\/pentairgridassemblyforfnsplus3659023500pen59023500","provider":"Freshized","version":"1.0","type":"link"}