{"product_id":"unicel-filter-cartridge-65-sf-watkins-c-8465","title":"Unicel C-8465 Replacement Filter Cartridge for Hot Springs Spas, Tiger River \u0026 Caldera Spas | 65 Sq. Ft. | 10 1\/2\"","description":"\u003cp\u003eWhen your Hot Springs, Tiger River, or Caldera spa needs its primary filter replaced, the Unicel C-8465 delivers an upgraded solution — 65 sq. ft. of 3 oz. Reemay® 2033 spun-bonded polyester media packed into 234 precision pleats, a significant step up from the original OEM cartridge. Drop-in fit, no modifications required.\u003c\/p\u003e\n\n\u003cdiv style=\"background: #fff3cd; border: 2px solid #FFEAA7; padding: 15px; border-radius: 5px; margin: 15px 0;\"\u003e\n\u003cstrong\u003e⚠️ 5-Filter System Notice\u003c\/strong\u003e\u003cbr\u003e\nHot Springs Spas, Tiger River, and Caldera Spas use a 5-filter system: \u003cstrong\u003eone (1) large primary filter\u003c\/strong\u003e and \u003cstrong\u003efour (4) smaller secondary filters\u003c\/strong\u003e. The C-8465 is the single large primary filter — you need only \u003cstrong\u003eone (1) C-8465\u003c\/strong\u003e per spa. The four smaller secondary filters are a separate part (Unicel C-4401).\n\u003c\/div\u003e\n\n\u003cdiv style=\"background: #fff3cd; border: 2px solid #FFEAA7; padding: 15px; border-radius: 5px; margin: 15px 0;\"\u003e\n\u003cstrong\u003e⚠️ Upgraded Replacement\u003c\/strong\u003e\u003cbr\u003e\nThe original OEM cartridge was rated at 45 sq. ft. (162 pleats). The Unicel C-8465 is an upgraded direct-fit replacement at \u003cstrong\u003e65 sq. ft. (234 pleats)\u003c\/strong\u003e — 44% more filtration area in the same physical dimensions.\n\u003c\/div\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003ctable style=\"border-collapse: collapse; border: 1px solid #ccc; width: 100%; margin: 20px 0;\"\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;\"\u003e65 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;\"\u003e10 1\/2\"\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;\"\u003e8 1\/2\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 10px;\"\u003e\u003cstrong\u003eTop Inner Diameter\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 10px;\"\u003e3\"\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\u003eBottom Inner Diameter\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 10px;\"\u003e3\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\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;\"\u003e3 oz. Reemay® 2033 Spun-Bonded Polyester\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\u003ePleat Count\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 10px;\"\u003e234\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 10px;\" colspan=\"2\"\u003e\n\u003ctable style=\"width: 100%; border-collapse: collapse;\"\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 50%; text-align: center; padding: 10px;\"\u003e\n\u003cdiv style=\"font-size: 12px; margin-bottom: 8px;\"\u003e\u003cstrong\u003eTop Cap: Open\u003c\/strong\u003e\u003c\/div\u003e\n\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0920\/0687\/5411\/files\/open_lip_seal12.gif\" alt=\"Top Cap - Open\" style=\"max-width: 100%; height: auto;\"\u003e\n\u003c\/td\u003e\n\u003ctd style=\"width: 50%; text-align: center; padding: 10px;\"\u003e\n\u003cdiv style=\"font-size: 12px; margin-bottom: 8px;\"\u003e\u003cstrong\u003eBottom Cap: Open\u003c\/strong\u003e\u003c\/div\u003e\n\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0920\/0687\/5411\/files\/open_lip_seal12.gif\" alt=\"Bottom Cap - Open\" style=\"max-width: 100%; height: auto;\"\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eOEM Compatibility\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\u003cth style=\"border: 1px solid #ccc; padding: 10px; text-align: left;\"\u003eOEM Brand\u003c\/th\u003e\n\u003cth style=\"border: 1px solid #ccc; padding: 10px; text-align: left;\"\u003eFilter Model\u003c\/th\u003e\n\u003cth style=\"border: 1px solid #ccc; padding: 10px; text-align: left;\"\u003eOEM Part Number\u003c\/th\u003e\n\u003cth style=\"border: 1px solid #ccc; padding: 10px; text-align: left;\"\u003eNotes\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 10px;\"\u003eHot Springs Spas\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;\"\u003e71828\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 10px;\"\u003eCurrent OEM P\/N — 1 primary filter required\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #f8f9fa;\"\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 10px;\"\u003eHot Springs Spas\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;\"\u003e71827\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 10px;\"\u003eOlder OEM P\/N (superseded by 71828)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 10px;\"\u003eHot Springs Spas\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;\"\u003e31114\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 10px;\"\u003eEarlier generation OEM P\/N\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #f8f9fa;\"\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 10px;\"\u003eTiger River\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;\"\u003e31114\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 10px;\"\u003e1 primary filter required\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 10px;\"\u003eCaldera Spas\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;\"\u003e76136\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 10px;\"\u003e1 primary filter required\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003cp\u003e\u003cem\u003eVerify your OEM part number against your spa's owner manual or filter housing label before ordering.\u003c\/em\u003e\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003e🔧 Pro Tip:\u003c\/strong\u003e Measure your existing filter before ordering — confirm 10 1\/2\" length and 8 1\/2\" outer diameter match your spa's housing. When replacing, also inspect your four smaller secondary filters (Unicel C-4401) and replace the full set together for optimal system performance. The 44% increase in filter area means longer intervals between cleanings and improved water clarity compared to the original OEM cartridge.\u003c\/p\u003e\n\u003cp class=\"sku-aliases\"\u003e\u003csmall\u003eAlso known as: C8465\u003c\/small\u003e\u003c\/p\u003e","brand":"Unicel","offers":[{"title":"Default Title","offer_id":51588784259347,"sku":"C-8465","price":64.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0920\/0687\/5411\/files\/C-8465__c-8465_1.jpg?v=1771456292","url":"https:\/\/poolaroo.com\/products\/unicel-filter-cartridge-65-sf-watkins-c-8465","provider":"Poolaroo","version":"1.0","type":"link"}