{"product_id":"unicel-filter-cartridge-20-sf-aqua-spa-c-4402","title":"Unicel C-4402 Replacement Filter Cartridge for Aqua Spa | 20 Sq. Ft. | 9¾\"","description":"\u003cp\u003eThe Unicel C-4402 delivers 20 square feet of filtration area in a compact 9¾\" spa cartridge built for Aqua Spa filter systems. Constructed with 4 oz. Reemay® 2040 spunbond polyester media across 138 precision pleats, it provides thorough debris capture and reliable flow performance. The molded cone handle top cap and slotted open bottom are engineered to seat securely in compatible Aqua Spa housings.\u003c\/p\u003e\n\n\u003cdiv style=\"background-color: #fff3cd; border: 2px solid #FFEAA7; padding: 15px; border-radius: 5px; margin: 15px 0;\"\u003e\n\u003cp\u003e\u003cstrong\u003e⚠️ Compatibility Note\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThis cartridge is listed as compatible with select Aqua Spa models. No specific model number or OEM part number is confirmed in the Unicel database. Always measure your existing cartridge before ordering and verify dimensions match: 20 sq. ft. | 9¾\" L × 4 5\/8\" OD × 1 7\/8\" bottom ID.\u003c\/p\u003e\n\u003c\/div\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 Area\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 10px;\"\u003e20 sq. ft.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 10px;\"\u003e\u003cstrong\u003eLength\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 10px;\"\u003e9¾\"\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\u003eOuter Diameter\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 10px;\"\u003e4 5\/8\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 10px;\"\u003e\u003cstrong\u003eBottom Inner Diameter\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 10px;\"\u003e1 7\/8\"\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\u003eTop Cap\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 10px;\"\u003eMolded cone handle (solid — no top opening)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 10px;\"\u003e\u003cstrong\u003eBottom Cap\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 10px;\"\u003eOpen with slots\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\u003eFilter Media\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 10px;\"\u003e4 oz. Reemay® 2040 spunbond polyester\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 10px;\"\u003e\u003cstrong\u003ePleat Count\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 10px;\"\u003e138\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #f8f9fa;\"\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 10px; text-align: center;\" colspan=\"2\"\u003e\n\u003cp style=\"font-size: 12px; margin: 5px 0;\"\u003e\u003cstrong\u003eTop Cap\u003c\/strong\u003e\u003c\/p\u003e\n\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0920\/0687\/5411\/files\/molded_cone_handle1.gif\" alt=\"Molded Cone Handle Top Cap\" style=\"max-width: 100%; height: auto;\"\u003e\n\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 10px; text-align: center;\"\u003e\n\u003cp style=\"font-size: 12px; margin: 5px 0;\"\u003e\u003cstrong\u003eBottom Cap\u003c\/strong\u003e\u003c\/p\u003e\n\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0920\/0687\/5411\/files\/open_with_slots1.gif\" alt=\"Open with Slots Bottom Cap\" style=\"max-width: 100%; height: auto;\"\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\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 #\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 10px;\"\u003e\u003cstrong\u003eNotes\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 10px;\"\u003eAqua Spa\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 10px;\"\u003eSelect Models\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 10px;\"\u003e—\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 10px;\"\u003eVerify dimensions against your existing cartridge before ordering.\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\u003ch3\u003ePro Tip\u003c\/h3\u003e\n\u003cp\u003eThis cartridge installs with the slotted bottom end seated over the standpipe in your filter housing — the solid molded cone handle at the top provides a secure grip for removal. Before ordering, measure your existing cartridge: length from end cap to end cap, outer diameter, and the inner diameter of the bottom opening. Dimensions should match within ⅛\" for proper fit and seal.\u003c\/p\u003e","brand":"Unicel","offers":[{"title":"Default Title","offer_id":51589743214867,"sku":"C4402","price":38.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0920\/0687\/5411\/files\/c-4402_1_2.jpg?v=1771959041","url":"https:\/\/poolaroo.com\/products\/unicel-filter-cartridge-20-sf-aqua-spa-c-4402","provider":"Poolaroo","version":"1.0","type":"link"}