{"product_id":"puret-fspp-45-foam-pad-4-5-for-big-blue-empty-cartridges-copy","title":"PureT FSPP-45 Foam Pad 4.5\" Diameter x 0.5” Depth For Big Blue Empty Cartridges","description":"\u003cp\u003e \u003c\/p\u003e\n\u003cstyle\u003e\n  .ro-wrap {\n    --deep:#0a1628;--ocean:#0f3460;--blue:#1565c0;--sky:#2196f3;--aqua:#4dd0e1;\n    --white:#ffffff;--offwhite:#f2f7fc;--slate:#dce8f5;--text:#0d1f38;--muted:#4a6280;\n    --gold:#f59e0b;--radius:12px;\n    font-family:'DM Sans',sans-serif;color:var(--text);line-height:1.6;-webkit-font-smoothing:antialiased;overflow-wrap:break-word;word-break:break-word;min-width:0;\n  }\n  .ro-wrap .ro-hero{background:linear-gradient(135deg,var(--deep) 0%,var(--ocean) 50%,#1a5276 100%);color:var(--white);padding:52px 40px 44px;position:relative;overflow:hidden;border-radius:var(--radius) var(--radius) 0 0;}\n  .ro-wrap .ro-hero::before{content:'';position:absolute;inset:0;background:radial-gradient(ellipse 70% 55% at 95% 45%,rgba(77,208,225,.15) 0%,transparent 65%),radial-gradient(ellipse 40% 40% at 5% 80%,rgba(255,255,255,.05) 0%,transparent 60%);pointer-events:none;}\n  .ro-wrap .ro-eyebrow{font-size:13px !important;font-weight:600;letter-spacing:.18em;text-transform:uppercase;color:var(--aqua);margin-bottom:12px;}\n  .ro-wrap .ro-hero h2{font-family:'DM Serif Display',serif;font-size:clamp(26px,4vw,40px) !important;line-height:1.15;font-weight:400;margin-bottom:16px;color:var(--white);}\n  .ro-wrap .ro-hero h2 em{font-style:italic;color:var(--aqua);}\n  .ro-wrap .ro-tagline{font-size:18px !important;color:rgba(255,255,255,.75);font-weight:300;margin-bottom:28px;}\n  .ro-wrap .ro-badges{display:flex;flex-wrap:wrap;gap:10px;}\n  .ro-wrap .ro-badge{display:inline-flex;align-items:center;gap:6px;background:rgba(255,255,255,.12);border:1px solid rgba(255,255,255,.2);color:var(--white);font-size:15px !important;font-weight:500;padding:6px 14px;border-radius:40px;backdrop-filter:blur(6px);}\n  .ro-wrap .ro-callout{background:var(--offwhite);border-left:4px solid var(--sky);padding:20px 24px;}\n  .ro-wrap .ro-callout p{font-size:18px !important;color:var(--text);line-height:1.7;margin:0;}\n  .ro-wrap .ro-callout strong{color:var(--ocean);}\n  .ro-wrap .ro-section{padding:36px 40px;border-bottom:1px solid var(--slate);}\n  .ro-wrap .ro-label{font-size:13px !important;font-weight:700;letter-spacing:.2em;text-transform:uppercase;color:var(--sky);margin-bottom:8px;}\n  .ro-wrap .ro-title{font-family:'DM Serif Display',serif;font-size:24px !important;color:var(--deep);margin-bottom:20px;font-weight:400;}\n  .ro-wrap .stage-pipeline{display:flex;flex-direction:column;gap:0;margin-top:4px;}\n  .ro-wrap .stage-row{display:flex;flex-direction:row;gap:12px;position:relative;min-width:0;align-items:flex-start;width:100%;box-sizing:border-box;}\n  .ro-wrap .stage-row:not(:last-child) .stage-line{position:absolute;left:17px;top:40px;bottom:0;width:2px;background:var(--slate);}\n  .ro-wrap .stage-num{width:36px;height:36px;min-width:36px;max-width:36px;border-radius:50%;background:linear-gradient(135deg,var(--ocean),var(--sky));color:white;display:flex;align-items:center;justify-content:center;font-size:16px !important;font-weight:700;flex:0 0 36px;position:relative;z-index:1;margin-top:16px;}\n  .ro-wrap .stage-body{background:var(--offwhite);border:1px solid var(--slate);border-radius:var(--radius);padding:16px 18px;margin-bottom:12px;flex:1 1 0;min-width:0;overflow:hidden;overflow-wrap:break-word;word-break:break-word;box-sizing:border-box;}\n  .ro-wrap .stage-body h3{font-size:20px !important;font-weight:600;color:var(--deep);margin-bottom:8px;margin-top:6px;}\n  .ro-wrap .stage-tag{display:block;font-size:12px !important;font-weight:700;letter-spacing:.04em;text-transform:uppercase;background:var(--slate);color:var(--ocean);padding:3px 8px;border-radius:4px;margin-bottom:8px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;max-width:100%;line-height:1.5 !important;box-sizing:border-box;}\n  .ro-wrap .stage-body p{font-size:18px !important;color:var(--muted);line-height:1.6;margin:0;display:block;}\n  .ro-wrap .stage-body .stage-part{font-size:15px !important;color:var(--sky);margin-top:6px;font-weight:500;}\n  .ro-wrap .specs-table{width:100%;border-collapse:collapse;font-size:18px !important;}\n  .ro-wrap .specs-table tr{border-bottom:1px solid var(--slate);}\n  .ro-wrap .specs-table tr:last-child{border-bottom:none;}\n  .ro-wrap .specs-table td{padding:11px 6px;vertical-align:top;}\n  .ro-wrap .specs-table td:first-child{font-weight:500;color:var(--deep);width:44%;padding-right:16px;}\n  .ro-wrap .specs-table td:last-child{color:var(--muted);}\n  .ro-wrap .specs-table tr:hover td{background:var(--offwhite);}\n  .ro-wrap .conditions-table{width:100%;border-collapse:collapse;font-size:18px !important;margin-top:4px;}\n  .ro-wrap .conditions-table th{background:var(--deep);color:var(--white);font-size:15px !important;font-weight:600;letter-spacing:.06em;text-transform:uppercase;padding:10px 12px;text-align:left;}\n  .ro-wrap .conditions-table th:first-child{border-radius:var(--radius) 0 0 0;}\n  .ro-wrap .conditions-table th:last-child{border-radius:0 var(--radius) 0 0;}\n  .ro-wrap .conditions-table td{padding:10px 12px;border-bottom:1px solid var(--slate);color:var(--text);}\n  .ro-wrap .conditions-table tr:nth-child(even) td{background:var(--offwhite);}\n  .ro-wrap .ro-feature-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(min(220px,100%),1fr));gap:16px;margin-top:4px;}\n  .ro-wrap .ro-feature-card{background:var(--offwhite);border:1px solid var(--slate);border-radius:var(--radius);padding:20px 18px;}\n  .ro-wrap .ro-feat-icon{width:40px;height:40px;background:linear-gradient(135deg,var(--ocean),var(--sky));border-radius:10px;display:flex;align-items:center;justify-content:center;margin-bottom:12px;}\n  .ro-wrap .ro-feature-card h3{font-size:20px !important;font-weight:600;color:var(--deep);margin-bottom:6px;}\n  .ro-wrap .ro-feature-card p{font-size:18px !important;color:var(--muted);line-height:1.55;margin:0;}\n  .ro-wrap .pro-tip{display:block;background:#fffbeb;border:1px solid #f5d87a;border-radius:var(--radius);padding:18px 20px;margin-top:20px;box-sizing:border-box;width:100% !important;}\n  .ro-wrap .pro-tip-icon{font-size:22px !important;display:inline;margin-right:8px;line-height:1.6 !important;}\n  .ro-wrap .pro-tip p{font-size:18px !important;color:#5a4500;line-height:1.6 !important;margin:0;display:block;width:100%;}\n  .ro-wrap .pro-tip strong{color:#3d2e00;}\n  .ro-wrap .install-steps{counter-reset:step;list-style:none;padding:0;margin:4px 0 0;display:flex;flex-direction:column;gap:14px;}\n  .ro-wrap .install-steps li{counter-increment:step;display:flex;align-items:flex-start;gap:14px;font-size:18px !important;color:var(--text);}\n  .ro-wrap .install-steps li::before{content:counter(step);display:flex;align-items:center;justify-content:center;width:28px;height:28px;border-radius:50%;background:var(--ocean);color:white;font-size:15px !important;font-weight:700;flex-shrink:0;margin-top:1px;}\n  .ro-wrap .filter-schedule{display:grid;grid-template-columns:repeat(auto-fill,minmax(min(180px,100%),1fr));gap:12px;margin-top:4px;}\n  .ro-wrap .schedule-card{background:var(--offwhite);border:1px solid var(--slate);border-radius:var(--radius);padding:16px;}\n  .ro-wrap .schedule-card .interval{font-size:22px !important;font-family:'DM Serif Display',serif;color:var(--sky);font-weight:400;margin-bottom:4px;}\n  .ro-wrap .schedule-card h4{font-size:18px !important;font-weight:600;color:var(--deep);margin-bottom:4px;}\n  .ro-wrap .schedule-card p{font-size:15px !important;color:var(--muted);margin:0;line-height:1.45;}\n  .ro-wrap .benefits-strip{display:flex;flex-wrap:wrap;background:var(--deep);color:var(--white);border-radius:0 0 var(--radius) var(--radius);overflow:hidden;}\n  .ro-wrap .benefit-item{flex:1 1 200px;padding:24px 22px;border-right:1px solid rgba(255,255,255,.1);}\n  .ro-wrap .benefit-item:last-child{border-right:none;}\n  .ro-wrap .bi-icon{font-size:22px !important;margin-bottom:10px;}\n  .ro-wrap .benefit-item h4{font-size:15px !important;font-weight:600;color:var(--aqua);margin-bottom:5px;text-transform:uppercase;letter-spacing:.05em;}\n  .ro-wrap .benefit-item p{font-size:15px !important;color:rgba(255,255,255,.65);line-height:1.55;margin:0;}\n  .ro-wrap .faucet-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(min(200px,100%),1fr));gap:16px;margin-top:4px;}\n  .ro-wrap .faucet-card{border:2px solid var(--slate);border-radius:var(--radius);padding:18px;text-align:center;}\n  .ro-wrap .faucet-icon{font-size:28px !important;margin-bottom:10px;}\n  .ro-wrap .faucet-card h4{font-size:18px !important;font-weight:600;color:var(--deep);margin-bottom:6px;}\n  .ro-wrap .faucet-card p{font-size:15px !important;color:var(--muted);line-height:1.5;margin:0;}\n  .ro-wrap .spec-cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(min(180px,100%),1fr));gap:12px;margin-top:4px;}\n  .ro-wrap .spec-card{background:var(--offwhite);border:1px solid var(--slate);border-radius:var(--radius);padding:16px;}\n  .ro-wrap .spec-card .sc-label{font-size:13px !important;font-weight:700;letter-spacing:.08em;color:var(--sky);text-transform:uppercase;margin-bottom:4px;}\n  .ro-wrap .spec-card .sc-value{font-size:20px !important;font-weight:600;color:var(--deep);margin-bottom:4px;}\n  .ro-wrap .spec-card .sc-note{font-size:15px !important;color:var(--muted);}\n  @media(max-width:640px){\n    .ro-wrap .ro-hero{padding:36px 24px 32px;}\n    .ro-wrap .ro-section{padding:28px 20px;}\n    .ro-wrap .ro-feature-grid,.ro-wrap .faucet-grid,.ro-wrap .filter-schedule,.ro-wrap .spec-cards{grid-template-columns:1fr;}\n    .ro-wrap .benefits-strip{flex-direction:column;}\n    .ro-wrap .benefit-item{border-right:none;border-bottom:1px solid rgba(255,255,255,.1);}\n  }\n  \/* ── Nuclear override — force all text inside ro-wrap to be readable ── *\/\n  .ro-wrap p,\n  .ro-wrap li,\n  .ro-wrap td,\n  .ro-wrap th,\n  .ro-wrap .ro-section \u003e p {\n    font-size: 18px !important;\n    line-height: 1.6 !important;\n  }\n  .ro-wrap .ro-section \u003e p,\n  .ro-wrap .ro-callout p,\n  .ro-wrap .stage-body p,\n  .ro-wrap .ro-feature-card p,\n  .ro-wrap .schedule-card p,\n  .ro-wrap .faucet-card p,\n  .ro-wrap .spec-card .sc-note,\n  .ro-wrap .pro-tip p {\n    font-size: 18px !important;\n    line-height: 1.6 !important;\n  }\n  .ro-wrap h2 { font-size: clamp(26px,4vw,40px) !important; line-height:1.15 !important; }\n  .ro-wrap h3 { font-size: 20px !important; line-height:1.3 !important; }\n  .ro-wrap h4 { font-size: 18px !important; line-height:1.3 !important; }\n  .ro-wrap .ro-label,\n  .ro-wrap .stage-tag,\n  .ro-wrap .sc-label { font-size: 14px !important; }\n  .ro-wrap .ro-title { font-size: 24px !important; }\n  .ro-wrap .interval { font-size: 22px !important; }\n  .ro-wrap .stage-num { font-size: 16px !important; }\n  .ro-wrap .ro-eyebrow { font-size: 14px !important; }\n  .ro-wrap .ro-badge { font-size: 15px !important; }\n\u003c\/style\u003e\n\u003cdiv class=\"ro-wrap\"\u003e\n\u003cdiv class=\"ro-callout\"\u003eThe PureT FSPP-45 is a 4.5-inch diameter foam pad separator designed specifically for Big Blue 10\" and 20\" empty filter cartridges. This lightweight media separator keeps different filtration materials properly divided or serves as void fill to prevent media migration inside your custom filter housings.\u003c\/div\u003e\n\u003cdiv class=\"ro-section\"\u003e\n\u003cdiv class=\"ro-label\"\u003eSPECIFICATIONS\u003c\/div\u003e\n\u003ch2 class=\"ro-title\"\u003ePureT FSPP-45 Foam Pad Technical Specifications\u003c\/h2\u003e\n\u003ctable class=\"specs-table\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eManufacturer\u003c\/td\u003e\n\u003ctd\u003ePureT\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel Number\u003c\/td\u003e\n\u003ctd\u003eFSPP-45\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePad Diameter\u003c\/td\u003e\n\u003ctd\u003e4.5 inches ; 0.5 inch thickness\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaterial\u003c\/td\u003e\n\u003ctd\u003eFoam\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompatible Cartridge Sizes\u003c\/td\u003e\n\u003ctd\u003e10\" and 20\" Big Blue empty cartridges\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePrimary Function\u003c\/td\u003e\n\u003ctd\u003eMedia separation and void fill\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Type\u003c\/td\u003e\n\u003ctd\u003eMedia pad separator\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"ro-section\"\u003e\n\u003cdiv class=\"ro-label\"\u003eCOMPATIBILITY \u0026amp; APPLICATIONS\u003c\/div\u003e\n\u003ch2 class=\"ro-title\"\u003eHow to Use the FSPP-45 Foam Separator\u003c\/h2\u003e\n\u003cp\u003eThe FSPP-45 foam pad is ideal for DIY water filter builders who need to separate different filtration media layers inside Big Blue empty cartridges. Use it to keep KDF from mixing with activated carbon, separate ion exchange resin from sediment media, or simply as void fill to prevent loose media from shifting during operation. The 4.5\" diameter fits standard Big Blue 10-inch and 20-inch empty housings, allowing you to build custom multi-media filters with proper layer separation. This separator prevents channeling and ensures each media performs its intended filtration role without cross-contamination.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"pro-tip\"\u003e💧 When building custom filters, use multiple FSPP-45 pads to create distinct filtration zones and prevent lighter media from floating above denser materials during backwash or high flow conditions.\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Puregen","offers":[{"title":"Default Title","offer_id":46084876927147,"sku":"FSPP-45","price":1.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0446\/7677\/6098\/products\/FI-ECPAD45.jpg?v=1759500601","url":"https:\/\/www.isopurewater.com\/products\/puret-fspp-45-foam-pad-4-5-for-big-blue-empty-cartridges-copy","provider":"Isopure Water","version":"1.0","type":"link"}