{"product_id":"unicel-fg-1236-de-filter-grid-18-3-8-pentair-purex-sm-smbw-2036-4036","title":"Unicel FG-1236 Replacement DE Filter Grid | 18-3\/8\" | Pentair Purex SM\/SMBW 2036 \u0026 4036","description":"\u003cp\u003eThe Unicel FG-1236 is a single replacement DE filter grid engineered for Pentair Purex SM and SMBW series filter systems with 36 square feet total filtration capacity. Featuring a precision-engineered collar with single notch and black adapter covering for a secure manifold fit, this grid is built to withstand system pressure while delivering reliable debris capture and extended service life.\u003c\/p\u003e\n\n\u003cp style=\"background-color: #fff3cd; border: 2px solid #FFEAA7; padding: 15px; border-radius: 5px; margin: 15px 0;\"\u003e\n\u003cstrong\u003e⚠️ IMPORTANT: CHECK BEFORE YOU BUY\u003c\/strong\u003e\u003cbr\u003e\n\u003cstrong\u003eThis product is a single (1) replacement DE filter grid — it is NOT a complete set. A full filter service requires multiple grids. Please verify the quantity and type (full or partial) needed for your specific filter model before ordering.\u003c\/strong\u003e\n\u003c\/p\u003e\n\n\u003cp style=\"background-color: #fff3cd; border: 2px solid #FFEAA7; padding: 15px; border-radius: 5px; margin: 15px 0;\"\u003e\n\u003cstrong\u003e⚠️ IMPORTANT: Partial Grid Also Required for Full Filter Service\u003c\/strong\u003e\u003cbr\u003e\nThe Pentair Purex SM\/SMBW 2036 and SM\/SMBW 4036 filters require \u003cstrong\u003e7 full grids (FG-1236) + 1 partial grid\u003c\/strong\u003e for a complete re-grid. This listing is for the full grid only. You will also need companion partial grid \u003cstrong\u003eUnicel FG-1235 (OEM: 07-0022)\u003c\/strong\u003e to complete your filter service.\n\u003c\/p\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003ctable style=\"width: 100%; border-collapse: collapse; margin: 20px 0; border: 1px solid #ccc;\"\u003e\n\u003ctr style=\"background-color: #f8f9fa;\"\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 10px;\"\u003e\u003cstrong\u003eFilter System Area\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 10px;\"\u003e36 sq. ft. (total system)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 10px;\"\u003e\u003cstrong\u003eGrid Length\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 10px;\"\u003e18-3\/8\" (measured from collar notch to opposite end)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #f8f9fa;\"\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 10px;\"\u003e\u003cstrong\u003eCollar Configuration\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 10px;\"\u003eSingle notch with black adapter covering\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 10px;\"\u003e\u003cstrong\u003eMaterial\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 10px;\"\u003eHigh-grade DE filter fabric with reinforced seaming\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003cp\u003e\u003cstrong\u003eNote from Unicel:\u003c\/strong\u003e Collar has single notch and is covered with a black adapter. Length is measured from collar notch to opposite end of grid.\u003c\/p\u003e\n\n\u003ch3\u003eFits Into:\u003c\/h3\u003e\n\u003ctable style=\"width: 100%; border-collapse: collapse; margin: 20px 0; border: 1px solid #ccc;\"\u003e\n\u003ctr style=\"background-color: #f8f9fa;\"\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 10px;\"\u003e\u003cstrong\u003eOEM Brand\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 10px;\"\u003e\u003cstrong\u003eFilter Model\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 10px;\"\u003e\u003cstrong\u003eOEM Part Number\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 10px;\"\u003e\u003cstrong\u003eGrid Configuration\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 10px;\"\u003ePentair – Purex\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 10px;\"\u003eSM\/SMBW 2036\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 10px;\"\u003e07-0023\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 10px;\"\u003e7 full + 1 partial (FG-1235)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #f8f9fa;\"\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 10px;\"\u003ePentair – Purex\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 10px;\"\u003eSM\/SMBW 4036\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 10px;\"\u003e07-0023\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 10px;\"\u003e7 full + 1 partial (FG-1235)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003cp\u003e\u003cem\u003e(This is not an exhaustive list.)\u003c\/em\u003e\u003c\/p\u003e\n\n\u003cp style=\"background-color: #fff3cd; border: 2px solid #FFEAA7; padding: 15px; border-radius: 5px; margin: 15px 0;\"\u003e\n\u003cstrong\u003e⚠️ IMPORTANT: Do Not Mix Premier and Purex Grids\u003c\/strong\u003e\u003cbr\u003e\n\u003cstrong\u003eDo not substitute or mix Premier and Purex grids.\u003c\/strong\u003e These grid types use different manifold connections. Mixing them will compromise the seal, allowing DE powder to bypass filtration and return to the pool — and can cause equipment damage. Use only Purex-compatible grids in these systems.\n\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003ePro Tip:\u003c\/strong\u003e Always turn off the pump and release all pressure from the filter tank via the air relief valve before opening the tank to replace grids. During service, inspect the tank o-ring and manifold assembly to ensure a proper seal before repressurizing the system.\u003c\/p\u003e\n\u003cp class=\"sku-aliases\"\u003e\u003csmall\u003eAlso known as: FG1236\u003c\/small\u003e\u003c\/p\u003e","brand":"Unicel","offers":[{"title":"Default Title","offer_id":53828218224915,"sku":"FG-1236","price":26.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0920\/0687\/5411\/files\/FG-1236__FG-1236_1.jpg?v=1771456359","url":"https:\/\/poolaroo.com\/products\/unicel-fg-1236-de-filter-grid-18-3-8-pentair-purex-sm-smbw-2036-4036","provider":"Poolaroo","version":"1.0","type":"link"}