{"product_id":"k-series-specialty-add-on-filters","title":"K Series Specialty Add-On Filters","description":"\u003cstyle\u003e\n    .pw_filter_specs_only {\n      width: 100%;\n      max-width: 980px;\n      margin: 28px auto;\n      font-family: Arial, Helvetica, sans-serif;\n      color: #1f1f1f;\n      box-sizing: border-box;\n    }\n\n    .pw_filter_specs_panel {\n      padding: 22px;\n      border-radius: 24px;\n      background: linear-gradient(135deg, #eef6ff 0%, #ffffff 52%, #f3f8ff 100%);\n      border: 1px solid #d9eaff;\n      box-sizing: border-box;\n    }\n\n    .pw_filter_specs_grid {\n      display: grid;\n      grid-template-columns: repeat(3, 1fr);\n      gap: 12px;\n    }\n\n    .pw_filter_specs_item {\n      position: relative;\n      overflow: hidden;\n      border: 1px solid #e2edf8;\n      border-radius: 16px;\n      background: rgba(255,255,255,.88);\n      padding: 16px;\n      box-sizing: border-box;\n      transition: transform .32s ease, box-shadow .32s ease, border-color .32s ease;\n    }\n\n    .pw_filter_specs_item::before {\n      content: \"\";\n      position: absolute;\n      top: 0;\n      left: -70%;\n      width: 55%;\n      height: 100%;\n      background: linear-gradient(120deg, transparent, rgba(255,255,255,.75), transparent);\n      transform: skewX(-18deg);\n      transition: left .65s ease;\n      pointer-events: none;\n    }\n\n    .pw_filter_specs_item:hover {\n      border-color: #b7d7ff;\n      transform: translateY(-3px);\n      box-shadow: 0 10px 24px rgba(3,106,255,.09);\n    }\n\n    .pw_filter_specs_item:hover::before {\n      left: 120%;\n    }\n\n    .pw_filter_specs_item span {\n      position: relative;\n      z-index: 1;\n      display: block;\n      margin-bottom: 7px;\n      font-size: 12px;\n      line-height: 1.3;\n      color: #60758d;\n      text-transform: uppercase;\n      letter-spacing: .35px;\n      font-weight: 700;\n    }\n\n    .pw_filter_specs_item strong {\n      position: relative;\n      z-index: 1;\n      display: block;\n      font-size: 15px;\n      line-height: 1.45;\n      color: #1f1f1f;\n      font-weight: 800;\n    }\n\n    .pw_filter_primary {\n      background: linear-gradient(135deg, #036AFF 0%, #2088ff 100%);\n      border-color: #036AFF;\n    }\n\n    .pw_filter_primary span,\n    .pw_filter_primary strong {\n      color: #ffffff;\n    }\n\n    .pw_filter_primary span {\n      opacity: .88;\n    }\n\n    .pw_filter_soft {\n      background: #f4f9ff;\n      border-color: #cfe4ff;\n    }\n\n    .pw_filter_soft span {\n      color: #036AFF;\n    }\n\n    .pw_filter_warning {\n      background: #fff8eb;\n      border-color: #ffe0a6;\n    }\n\n    .pw_filter_warning span {\n      color: #a46400;\n    }\n\n    .pw_filter_options_wrap {\n      margin-top: 16px;\n      padding: 18px;\n      border-radius: 20px;\n      background: #ffffff;\n      border: 1px solid #dcecff;\n      box-sizing: border-box;\n    }\n\n    .pw_filter_section_title {\n      margin: 0 0 14px;\n      font-size: 14px;\n      line-height: 1.3;\n      color: #1f1f1f;\n      font-weight: 800;\n      text-transform: uppercase;\n      letter-spacing: .45px;\n    }\n\n    .pw_filter_options_grid {\n      display: grid;\n      grid-template-columns: repeat(2, 1fr);\n      gap: 12px;\n    }\n\n    .pw_filter_option_card {\n      position: relative;\n      overflow: hidden;\n      border-radius: 18px;\n      border: 1px solid #dcecff;\n      background: linear-gradient(180deg, #f6fbff 0%, #ffffff 100%);\n      padding: 18px;\n      box-sizing: border-box;\n      transition: transform .32s ease, box-shadow .32s ease, border-color .32s ease;\n    }\n\n    .pw_filter_option_card:hover {\n      transform: translateY(-3px);\n      border-color: #b7d7ff;\n      box-shadow: 0 10px 24px rgba(3,106,255,.09);\n    }\n\n    .pw_filter_option_top {\n      display: flex;\n      flex-wrap: wrap;\n      align-items: center;\n      justify-content: space-between;\n      gap: 10px;\n      margin-bottom: 12px;\n    }\n\n    .pw_filter_option_name {\n      margin: 0;\n      font-size: 18px;\n      line-height: 1.35;\n      color: #111;\n      font-weight: 800;\n    }\n\n    .pw_filter_item_badge {\n      display: inline-block;\n      padding: 6px 10px;\n      border-radius: 999px;\n      background: #036AFF;\n      color: #ffffff;\n      font-size: 12px;\n      line-height: 1.2;\n      font-weight: 800;\n      letter-spacing: .2px;\n    }\n\n    .pw_filter_option_block {\n      margin-top: 14px;\n    }\n\n    .pw_filter_option_label {\n      display: block;\n      margin-bottom: 8px;\n      font-size: 11px;\n      line-height: 1.3;\n      color: #60758d;\n      text-transform: uppercase;\n      font-weight: 800;\n      letter-spacing: .35px;\n    }\n\n    .pw_filter_option_card ul {\n      margin: 0;\n      padding-left: 18px;\n      font-size: 13px;\n      line-height: 1.58;\n      color: #333;\n    }\n\n    .pw_filter_feature_tags {\n      display: flex;\n      flex-wrap: wrap;\n      gap: 7px;\n      margin-top: 8px;\n    }\n\n    .pw_filter_feature_tags em {\n      display: inline-block;\n      padding: 6px 9px;\n      border-radius: 999px;\n      background: #eef6ff;\n      color: #036AFF;\n      font-size: 12px;\n      line-height: 1.2;\n      font-style: normal;\n      font-weight: 800;\n    }\n\n    .pw_filter_perf_grid {\n      display: grid;\n      grid-template-columns: 1fr;\n      gap: 8px;\n      margin-top: 10px;\n    }\n\n    .pw_filter_perf_item {\n      padding: 10px 12px;\n      border-radius: 12px;\n      background: #f4f9ff;\n      border: 1px solid #e2edf8;\n      box-sizing: border-box;\n    }\n\n    .pw_filter_perf_item span {\n      display: block;\n      margin-bottom: 4px;\n      font-size: 11px;\n      line-height: 1.3;\n      color: #60758d;\n      text-transform: uppercase;\n      font-weight: 800;\n      letter-spacing: .35px;\n    }\n\n    .pw_filter_perf_item strong {\n      display: block;\n      font-size: 13px;\n      line-height: 1.45;\n      color: #1f1f1f;\n      font-weight: 800;\n    }\n\n    .pw_filter_notes_wrap {\n      margin-top: 16px;\n      padding: 18px;\n      border: 1px solid #dcecff;\n      border-radius: 20px;\n      background: rgba(255,255,255,.84);\n      box-sizing: border-box;\n    }\n\n    .pw_filter_notes_grid {\n      display: grid;\n      grid-template-columns: repeat(2, 1fr);\n      gap: 10px;\n    }\n\n    .pw_filter_note_item {\n      position: relative;\n      overflow: hidden;\n      display: flex;\n      gap: 10px;\n      padding: 13px 14px;\n      border-radius: 14px;\n      background: #ffffff;\n      border: 1px solid #edf3fb;\n      box-sizing: border-box;\n      transition: transform .3s ease, box-shadow .3s ease, border-color .3s ease;\n    }\n\n    .pw_filter_note_item::before {\n      content: \"\";\n      position: absolute;\n      left: 0;\n      top: 0;\n      width: 3px;\n      height: 100%;\n      background: #b9d8ff;\n      transition: width .3s ease, background .3s ease;\n    }\n\n    .pw_filter_note_item:hover {\n      transform: translateY(-2px);\n      border-color: #dcecff;\n      box-shadow: 0 8px 18px rgba(3,106,255,.08);\n    }\n\n    .pw_filter_note_item:hover::before {\n      width: 5px;\n      background: #036AFF;\n    }\n\n    .pw_filter_note_num {\n      position: relative;\n      z-index: 1;\n      min-width: 24px;\n      font-size: 12px;\n      line-height: 1.5;\n      color: #036AFF;\n      font-weight: 800;\n    }\n\n    .pw_filter_note_text {\n      position: relative;\n      z-index: 1;\n      margin: 0;\n      font-size: 13px;\n      line-height: 1.55;\n      color: #4f5f70;\n    }\n\n    .pw_filter_specs_note {\n      margin-top: 14px;\n      padding: 14px 16px;\n      border-radius: 14px;\n      background: #eef6ff;\n      border: 1px solid #dcecff;\n      font-size: 13px;\n      line-height: 1.6;\n      color: #4f5f70;\n      box-sizing: border-box;\n    }\n\n    @media (max-width: 768px) {\n      .pw_filter_specs_only {\n        padding: 0 14px;\n        margin: 22px auto;\n      }\n\n      .pw_filter_specs_panel {\n        padding: 16px;\n        border-radius: 20px;\n      }\n\n      .pw_filter_specs_grid,\n      .pw_filter_options_grid,\n      .pw_filter_notes_grid {\n        grid-template-columns: 1fr;\n      }\n\n      .pw_filter_specs_item,\n      .pw_filter_option_card {\n        padding: 15px;\n      }\n\n      .pw_filter_specs_item strong {\n        font-size: 14px;\n      }\n\n      .pw_filter_option_card ul {\n        font-size: 13px;\n      }\n\n      .pw_filter_notes_wrap,\n      .pw_filter_options_wrap {\n        padding: 15px;\n      }\n\n      .pw_filter_note_item {\n        padding: 12px 13px;\n      }\n\n      .pw_filter_note_text {\n        font-size: 13px;\n      }\n    }\n  \u003c\/style\u003e\n\u003cdiv class=\"pw_filter_specs_only\"\u003e\n\u003cdiv class=\"pw_filter_specs_panel\"\u003e\n\u003cdiv class=\"pw_filter_specs_grid\"\u003e\n\u003cdiv class=\"pw_filter_specs_item pw_filter_primary\"\u003e\n\u003cspan\u003eProduct Type\u003c\/span\u003e \u003cstrong\u003eSupplemental Filter\u003c\/strong\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"pw_filter_specs_item pw_filter_primary\"\u003e\n\u003cspan\u003eFiltration Options\u003c\/span\u003e \u003cstrong\u003e5-Stage \/ 3-Stage\u003c\/strong\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"pw_filter_specs_item pw_filter_primary\"\u003e\n\u003cspan\u003eRequired Pairing\u003c\/span\u003e \u003cstrong\u003eCore Filter\u003c\/strong\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"pw_filter_specs_item pw_filter_soft\"\u003e\n\u003cspan\u003ePackage Quantity\u003c\/span\u003e \u003cstrong\u003e1 Box \/ 2 Supplemental Filters\u003c\/strong\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"pw_filter_specs_item pw_filter_soft\"\u003e\n\u003cspan\u003eFilter Life\u003c\/span\u003e \u003cstrong\u003eUp to 200–1,000 Gallons per Box\u003c\/strong\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"pw_filter_specs_item pw_filter_soft\"\u003e\n\u003cspan\u003eFlow Rate\u003c\/span\u003e \u003cstrong\u003eDepends on Core Filter Flow and Water Pressure\u003c\/strong\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"pw_filter_specs_item\"\u003e\n\u003cspan\u003eSeries\u003c\/span\u003e \u003cstrong\u003eK Series\u003c\/strong\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"pw_filter_specs_item\"\u003e\n\u003cspan\u003eFilter Size\u003c\/span\u003e \u003cstrong\u003eApprox. 2.76 in × 6.30 in \/ Φ7 × 16 cm\u003c\/strong\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"pw_filter_specs_item pw_filter_warning\"\u003e\n\u003cspan\u003eImportant Use\u003c\/span\u003e \u003cstrong\u003eAdd-on filter only. Not intended to be used alone.\u003c\/strong\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"pw_filter_options_wrap\"\u003e\n\u003cdiv class=\"pw_filter_section_title\"\u003eFiltration Options \u0026amp; Item Numbers\u003c\/div\u003e\n\u003cdiv class=\"pw_filter_options_grid\"\u003e\n\u003cdiv class=\"pw_filter_option_card\"\u003e\n\u003cdiv class=\"pw_filter_option_top\"\u003e\n\u003ch3 class=\"pw_filter_option_name\"\u003e5-Stage Reduce Fluoride\u003c\/h3\u003e\n\u003cdiv class=\"pw_filter_item_badge\"\u003eItem No. K8003\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"pw_filter_option_block\"\u003e\n\u003cspan class=\"pw_filter_option_label\"\u003eFilter Material\u003c\/span\u003e\n\u003cul\u003e\n\u003cli\u003eFirst PP Cotton\u003c\/li\u003e\n\u003cli\u003eActivated Carbon\u003c\/li\u003e\n\u003cli\u003eSecond PP Cotton\u003c\/li\u003e\n\u003cli\u003eFluoride Reduction Material\u003c\/li\u003e\n\u003cli\u003eThird PP Cotton\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"pw_filter_option_block\"\u003e\n\u003cspan class=\"pw_filter_option_label\"\u003eKey Functions\u003c\/span\u003e\n\u003cdiv class=\"pw_filter_feature_tags\"\u003e\n\u003cem\u003eReduces Chlorine\u003c\/em\u003e \u003cem\u003eReduces Fluoride\u003c\/em\u003e \u003cem\u003eAdd-on Filtration\u003c\/em\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"pw_filter_option_block\"\u003e\n\u003cspan class=\"pw_filter_option_label\"\u003ePerformance Details\u003c\/span\u003e\n\u003cdiv class=\"pw_filter_perf_grid\"\u003e\n\u003cdiv class=\"pw_filter_perf_item\"\u003e\n\u003cspan\u003eFilter Life\u003c\/span\u003e \u003cstrong\u003eUp to 1,000 Gallons per Box\u003c\/strong\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"pw_filter_perf_item\"\u003e\n\u003cspan\u003eBox Weight\u003c\/span\u003e \u003cstrong\u003eApprox. 1.39 lb Net \/ 1.52 lb Gross\u003c\/strong\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"pw_filter_option_card\"\u003e\n\u003cdiv class=\"pw_filter_option_top\"\u003e\n\u003ch3 class=\"pw_filter_option_name\"\u003e3-Stage Alkaline Filter\u003c\/h3\u003e\n\u003cdiv class=\"pw_filter_item_badge\"\u003eItem No. K8002\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"pw_filter_option_block\"\u003e\n\u003cspan class=\"pw_filter_option_label\"\u003eFilter Material\u003c\/span\u003e\n\u003cul\u003e\n\u003cli\u003eFirst PP Cotton\u003c\/li\u003e\n\u003cli\u003eAlkaline Material\u003c\/li\u003e\n\u003cli\u003eSecond PP Cotton\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"pw_filter_option_block\"\u003e\n\u003cspan class=\"pw_filter_option_label\"\u003eKey Functions\u003c\/span\u003e\n\u003cdiv class=\"pw_filter_feature_tags\"\u003e\n\u003cem\u003eRaises PH Level\u003c\/em\u003e \u003cem\u003eAdd-on Filtration\u003c\/em\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"pw_filter_option_block\"\u003e\n\u003cspan class=\"pw_filter_option_label\"\u003ePerformance Details\u003c\/span\u003e\n\u003cdiv class=\"pw_filter_perf_grid\"\u003e\n\u003cdiv class=\"pw_filter_perf_item\"\u003e\n\u003cspan\u003eFilter Life\u003c\/span\u003e \u003cstrong\u003eUp to 200 Gallons per Box\u003c\/strong\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"pw_filter_perf_item\"\u003e\n\u003cspan\u003eBox Weight\u003c\/span\u003e \u003cstrong\u003eApprox. 1.39 lb Net \/ 1.52 lb Gross\u003c\/strong\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"pw_filter_notes_wrap\"\u003e\n\u003cdiv class=\"pw_filter_section_title\"\u003eUse Notes\u003c\/div\u003e\n\u003cdiv class=\"pw_filter_notes_grid\"\u003e\n\u003cdiv class=\"pw_filter_note_item\"\u003e\n\u003cdiv class=\"pw_filter_note_num\"\u003e01\u003c\/div\u003e\n\u003cp class=\"pw_filter_note_text\"\u003eThis is a supplemental filter and must be used together with compatible K Series or SS Series core filters.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"pw_filter_note_item\"\u003e\n\u003cdiv class=\"pw_filter_note_num\"\u003e02\u003c\/div\u003e\n\u003cp class=\"pw_filter_note_text\"\u003eChoose 5-Stage Reduce Fluoride if you want added fluoride reduction after the core filter stage.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"pw_filter_note_item\"\u003e\n\u003cdiv class=\"pw_filter_note_num\"\u003e03\u003c\/div\u003e\n\u003cp class=\"pw_filter_note_text\"\u003eChoose 3-Stage Alkaline Filter if you want an additional alkaline material layer designed to raise PH level.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"pw_filter_note_item\"\u003e\n\u003cdiv class=\"pw_filter_note_num\"\u003e04\u003c\/div\u003e\n\u003cp class=\"pw_filter_note_text\"\u003eAlso works with Travel, Big, Royal, Imperial, Light, and Crown Berkey models as an additional gravity filter option.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"pw_filter_note_item\"\u003e\n\u003cdiv class=\"pw_filter_note_num\"\u003e05\u003c\/div\u003e\n\u003cp class=\"pw_filter_note_text\"\u003eDo not over-tighten during installation. Make sure the supplemental filter is securely attached to the core filter stem.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"pw_filter_note_item\"\u003e\n\u003cdiv class=\"pw_filter_note_num\"\u003e06\u003c\/div\u003e\n\u003cp class=\"pw_filter_note_text\"\u003eReplace the supplemental filters when the rated capacity is reached or when water flow becomes noticeably slower.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"pw_filter_specs_note\"\u003eNote: This product is an add-on supplemental filter and is not designed to replace the main core filter by itself. Filter life and flow rate may vary depending on source water quality, water pressure, core filter condition, usage frequency, and maintenance conditions. Third-party brand and model names are used for compatibility reference only.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Purewell","offers":[{"title":"5-Stage Reduce Fluoride","offer_id":45830413844645,"sku":"FL-2\/K8003","price":59.99,"currency_code":"USD","in_stock":true},{"title":"3-Stage Alkaline Filter","offer_id":45830413877413,"sku":"PH-2\/K8002","price":59.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0562\/2788\/9317\/files\/Specialty-Add-On-Filters-for-Gravity-Water-Systems-Purewell-40490661.jpg?v=1783475058","url":"https:\/\/www.purewell.com\/products\/k-series-specialty-add-on-filters","provider":"Purewell","version":"1.0","type":"link"}