{"product_id":"darlly-sr300-inner-and-outer-cartridge-set-for-sta-rite-system-3-s7m120","title":"Darlly SR300 Inner and Outer Cartridge Set for Sta-Rite System 3 S7M120","description":"\n\n\n\u003cstyle\u003e\n  .dlsr300-wrap, .dlsr300-wrap * { box-sizing: border-box; }\n  .dlsr300-wrap { font-family: inherit; color: #3a404a; font-size: 16px; line-height: 1.65; }\n  .dlsr300-wrap :where(h2, h3, p, ul, ol, li, table) { margin: 0; padding: 0; letter-spacing: normal; }\n  .dlsr300-wrap strong { color: #14171c; font-weight: 700; }\n  .dlsr300-ico { display: block; flex: none; width: 24px; height: 24px; }\n\n  \/* Hero, with the stat strip built in *\/\n  .dlsr300-hero { background: #0f1a2a; border-radius: 16px; padding: 44px 44px 0; margin-bottom: 36px; overflow: hidden; }\n  .dlsr300-marks { list-style: none; display: flex; flex-wrap: wrap; gap: 8px 22px; margin-bottom: 16px; }\n  .dlsr300-marks li { display: inline-flex; align-items: center; gap: 7px; font-size: 0.9em; font-weight: 700; color: #d5dbe4; line-height: 1.3; }\n  .dlsr300-marks .dlsr300-ico { width: 16px; height: 16px; color: #ffa620; stroke-width: 2.75; }\n  .dlsr300-hero h2 { color: #fff; font-size: 2.4em; font-weight: 800; line-height: 1.12; letter-spacing: -0.015em; max-width: 20em; margin-bottom: 10px; text-wrap: balance; }\n  .dlsr300-tagline { font-size: 1.2em; color: #aab4c3; }\n  .dlsr300-stats { display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); margin: 34px -44px 0; border-top: 1px solid rgba(255,255,255,0.1); }\n  .dlsr300-stats.dlsr300-n4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }\n  .dlsr300-stats.dlsr300-n3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }\n  .dlsr300-stat { padding: 20px 22px 24px 44px; border-left: 1px solid rgba(255,255,255,0.1); }\n  .dlsr300-stat:first-child { border-left: 0; }\n  .dlsr300-stat + .dlsr300-stat { padding-left: 22px; }\n  .dlsr300-stat-v { font-size: 1.7em; font-weight: 800; color: #fff; line-height: 1.15; font-variant-numeric: tabular-nums; }\n  .dlsr300-stat-l { font-size: 0.75em; font-weight: 700; text-transform: uppercase; letter-spacing: 0.08em; color: #8d98a8; margin-top: 6px; }\n\n  .dlsr300-intro { max-width: 860px; margin-bottom: 44px; font-size: 1.12em; line-height: 1.7; }\n\n  \/* Sections *\/\n  .dlsr300-section { margin-bottom: 44px; }\n  .dlsr300-section \u003e h2 { font-size: 1.6em; font-weight: 800; color: #0f1a2a; line-height: 1.25; margin-bottom: 20px; }\n\n  \/* Feature cards, light so a short page keeps its contrast for the hero and CTA *\/\n  .dlsr300-cards { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 18px; }\n  .dlsr300-cards.dlsr300-n4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }\n  .dlsr300-card { border: 1px solid #e1e5eb; border-radius: 12px; padding: 22px; }\n  .dlsr300-card .dlsr300-ico { width: 26px; height: 26px; color: #b86a00; margin-bottom: 12px; }\n  .dlsr300-card h3 { font-size: 1.06em; font-weight: 800; color: #0f1a2a; line-height: 1.3; margin-bottom: 6px; }\n  .dlsr300-card p { font-size: 0.95em; }\n\n  \/* Warning *\/\n  .dlsr300-warning { display: flex; gap: 16px; background: #fff8e8; border: 1px solid #f1dfb2; border-radius: 12px; padding: 20px 22px; margin-bottom: 44px; }\n  .dlsr300-warning .dlsr300-ico { width: 26px; height: 26px; color: #b7791f; margin-top: 1px; }\n  .dlsr300-warning h3 { font-size: 1.06em; font-weight: 800; color: #7a4e00; margin-bottom: 4px; }\n  .dlsr300-warning p { color: #5a4216; }\n\n  \/* Specs: one column, striped, groups under an amber rule *\/\n  .dlsr300-specs-box { max-width: 900px; border: 1px solid #e1e5eb; border-radius: 14px; overflow: hidden; }\n  .dlsr300-specs { width: 100%; border-collapse: collapse; }\n  .dlsr300-specs th, .dlsr300-specs td { border: 0; padding: 12px 20px; text-align: left; vertical-align: top; font-size: 0.97em; line-height: 1.5; }\n  .dlsr300-specs tr:nth-child(even of :not(.dlsr300-grp)) \u003e * { background: #f6f7f9; }\n  .dlsr300-specs th { width: 38%; font-weight: 700; color: #0f1a2a; }\n  .dlsr300-specs td { color: #3a404a; font-weight: 500; }\n  .dlsr300-specs .dlsr300-grp th { width: auto; padding: 15px 20px 9px; font-size: 0.78em; font-weight: 800; text-transform: uppercase; letter-spacing: 0.08em; color: #0f1a2a; border-bottom: 2px solid #ffa620; }\n  .dlsr300-specs tbody + tbody .dlsr300-grp th { padding-top: 24px; }\n  .dlsr300-mono { font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; font-size: 0.92em; color: #0f1a2a; }\n\n  \/* FAQ *\/\n  .dlsr300-faq { max-width: 900px; display: grid; gap: 12px; }\n  .dlsr300-faq-card { border: 1px solid #e1e5eb; border-radius: 12px; padding: 18px 22px; }\n  .dlsr300-faq-card h3 { font-size: 1.06em; font-weight: 800; color: #0f1a2a; line-height: 1.35; margin-bottom: 6px; }\n\n  \/* CTA *\/\n  .dlsr300-cta { display: grid; grid-template-columns: minmax(0, 1.2fr) minmax(0, 1fr); gap: 30px; align-items: center; background: #0f1a2a; border-radius: 16px; padding: 38px 44px; }\n  .dlsr300-cta h2 { color: #fff; font-size: 1.7em; font-weight: 800; line-height: 1.2; margin-bottom: 8px; text-wrap: balance; }\n  .dlsr300-cta p { color: #aab4c3; font-size: 1.02em; }\n  .dlsr300-perks { list-style: none; display: grid; gap: 11px; }\n  .dlsr300-perks li { display: flex; align-items: center; gap: 10px; font-weight: 700; color: #fff; line-height: 1.3; }\n  .dlsr300-perks .dlsr300-ico { width: 20px; height: 20px; color: #ffa620; stroke-width: 2.5; }\n\n  @media (max-width: 989px) {\n    .dlsr300-cards, .dlsr300-cards.dlsr300-n4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }\n  }\n  @media (max-width: 749px) {\n    .dlsr300-hero { padding: 30px 20px 0; }\n    .dlsr300-hero h2 { font-size: 1.75em; }\n    .dlsr300-stats { grid-template-columns: repeat(2, minmax(0, 1fr)); margin: 24px -20px 0; }\n    .dlsr300-stat, .dlsr300-stat + .dlsr300-stat { padding: 15px 20px; border-left: 0; border-top: 1px solid rgba(255,255,255,0.1); }\n    .dlsr300-stat:first-child { grid-column: 1 \/ -1; border-top: 0; }\n    .dlsr300-stat:nth-child(odd):not(:first-child) { border-left: 1px solid rgba(255,255,255,0.1); }\n    .dlsr300-stats.dlsr300-n4 .dlsr300-stat:first-child { grid-column: auto; }\n    .dlsr300-stats.dlsr300-n4 .dlsr300-stat:nth-child(2) { border-top: 0; }\n    .dlsr300-stats.dlsr300-n4 .dlsr300-stat:nth-child(odd) { border-left: 0; }\n    .dlsr300-stats.dlsr300-n4 .dlsr300-stat:nth-child(even) { border-left: 1px solid rgba(255,255,255,0.1); }\n    .dlsr300-intro { font-size: 1.06em; }\n    .dlsr300-cards, .dlsr300-cards.dlsr300-n4 { grid-template-columns: 1fr; }\n    .dlsr300-specs th, .dlsr300-specs td { padding: 11px 14px; }\n    .dlsr300-specs .dlsr300-grp th { padding-left: 14px; }\n    .dlsr300-specs th { width: 42%; }\n    .dlsr300-cta { grid-template-columns: 1fr; padding: 28px 20px; gap: 20px; }\n  }\n\u003c\/style\u003e\n\n\u003cdiv class=\"dlsr300-wrap\"\u003e\n\n  \u003csection class=\"dlsr300-hero\"\u003e\n    \u003cul class=\"dlsr300-marks\"\u003e\n\u003cli\u003e\n\u003csvg class=\"dlsr300-ico\" viewbox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"1.75\" stroke-linecap=\"round\" stroke-linejoin=\"round\" aria-hidden=\"true\" focusable=\"false\"\u003e\u003cpath d=\"M20 6 9 17l-5-5\"\u003e\u003c\/path\u003e\u003c\/svg\u003eDarlly SR300\u003c\/li\u003e\n\u003cli\u003e\n\u003csvg class=\"dlsr300-ico\" viewbox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"1.75\" stroke-linecap=\"round\" stroke-linejoin=\"round\" aria-hidden=\"true\" focusable=\"false\"\u003e\u003cpath d=\"M20 6 9 17l-5-5\"\u003e\u003c\/path\u003e\u003c\/svg\u003eInner and outer cartridges\u003c\/li\u003e\n\u003cli\u003e\n\u003csvg class=\"dlsr300-ico\" viewbox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"1.75\" stroke-linecap=\"round\" stroke-linejoin=\"round\" aria-hidden=\"true\" focusable=\"false\"\u003e\u003cpath d=\"M20 6 9 17l-5-5\"\u003e\u003c\/path\u003e\u003c\/svg\u003eS7M120 fitment\u003c\/li\u003e\n\u003c\/ul\u003e\n    \u003ch2\u003eDarlly SR300 Inner and Outer Cartridge Set for Sta-Rite System 3 S7M120\u003c\/h2\u003e\n    \u003cp class=\"dlsr300-tagline\"\u003eReplace both cartridges with one set.\u003c\/p\u003e\n    \u003cdiv class=\"dlsr300-stats dlsr300-n4\"\u003e\n      \u003cdiv class=\"dlsr300-stat\"\u003e\n\u003cdiv class=\"dlsr300-stat-v\"\u003eSR300\u003c\/div\u003e\n\u003cdiv class=\"dlsr300-stat-l\"\u003eDarlly Model\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"dlsr300-stat\"\u003e\n\u003cdiv class=\"dlsr300-stat-v\"\u003eS7M120\u003c\/div\u003e\n\u003cdiv class=\"dlsr300-stat-l\"\u003eCompatible Filter\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"dlsr300-stat\"\u003e\n\u003cdiv class=\"dlsr300-stat-v\"\u003e2\u003c\/div\u003e\n\u003cdiv class=\"dlsr300-stat-l\"\u003eCartridges Included\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"dlsr300-stat\"\u003e\n\u003cdiv class=\"dlsr300-stat-v\"\u003e4 oz\u003c\/div\u003e\n\u003cdiv class=\"dlsr300-stat-l\"\u003eFilter Media Grade\u003c\/div\u003e\n\u003c\/div\u003e\n    \u003c\/div\u003e\n  \u003c\/section\u003e\n\n  \u003cp class=\"dlsr300-intro\"\u003eThe Darlly \u003cstrong\u003eSR300\u003c\/strong\u003e replacement cartridge set includes the inner and outer filters for the Sta-Rite System 3 S7M120. It gives you both elements when worn or damaged media needs replacement. Match your filter tank model to S7M120 before ordering this set, listed as SKU PST-17-777-2700.\u003c\/p\u003e\n\n  \u003csection class=\"dlsr300-section\"\u003e\n    \u003ch2\u003eWhy PST Customers Pick This\u003c\/h2\u003e\n    \u003cdiv class=\"dlsr300-cards dlsr300-n3\"\u003e\n      \u003cdiv class=\"dlsr300-card\"\u003e\n\u003csvg class=\"dlsr300-ico\" viewbox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"1.75\" stroke-linecap=\"round\" stroke-linejoin=\"round\" aria-hidden=\"true\" focusable=\"false\"\u003e\u003cpath d=\"M12 22a7 7 0 0 0 7-7c0-2-1-3.9-3-5.5s-3.5-4-4-6.5c-.5 2.5-2 4.9-4 6.5C6 11.1 5 13 5 15a7 7 0 0 0 7 7z\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\u003ch3\u003eInner and Outer Included\u003c\/h3\u003e\n\u003cp\u003eThe set supplies both cartridges used in the compatible filter, keeping the inner and outer replacement elements together in one order.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"dlsr300-card\"\u003e\n\u003csvg class=\"dlsr300-ico\" viewbox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"1.75\" stroke-linecap=\"round\" stroke-linejoin=\"round\" aria-hidden=\"true\" focusable=\"false\"\u003e\u003ccircle cx=\"12\" cy=\"12\" r=\"10\"\u003e\u003c\/circle\u003e \u003ccircle cx=\"12\" cy=\"12\" r=\"6\"\u003e\u003c\/circle\u003e \u003ccircle cx=\"12\" cy=\"12\" r=\"2\"\u003e\u003c\/circle\u003e\u003c\/svg\u003e\u003ch3\u003eMatch the S7M120 Model\u003c\/h3\u003e\n\u003cp\u003eUse the model on your filter tank to confirm fitment. This SR300 listing is specified for the Sta-Rite System 3 S7M120 cartridge arrangement.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"dlsr300-card\"\u003e\n\u003csvg class=\"dlsr300-ico\" viewbox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"1.75\" stroke-linecap=\"round\" stroke-linejoin=\"round\" aria-hidden=\"true\" focusable=\"false\"\u003e\u003cpath d=\"M14.7 6.3a1 1 0 0 0 0 1.4l1.6 1.6a1 1 0 0 0 1.4 0l3.77-3.77a6 6 0 0 1-7.94 7.94l-6.91 6.91a2.12 2.12 0 0 1-3-3l6.91-6.91a6 6 0 0 1 7.94-7.94l-3.76 3.76z\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\u003ch3\u003eReplace Worn Filter Media\u003c\/h3\u003e\n\u003cp\u003eReplace damaged or worn cartridges with the matched Darlly set. Follow the filter system manual when removing, seating and reinstalling the cartridges.\u003c\/p\u003e\n\u003c\/div\u003e\n    \u003c\/div\u003e\n  \u003c\/section\u003e\n\n  \n\n  \u003csection class=\"dlsr300-section\"\u003e\n    \u003ch2\u003eSpecifications\u003c\/h2\u003e\n    \u003cdiv class=\"dlsr300-specs-box\"\u003e\u003ctable class=\"dlsr300-specs\"\u003e\n\u003ctbody\u003e\n\u003ctr class=\"dlsr300-grp\"\u003e\u003cth colspan=\"2\" scope=\"colgroup\"\u003eProduct Identification\u003c\/th\u003e\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eManufacturer\u003c\/th\u003e\n\u003ctd\u003eDarlly Filtration\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003ePart Number\u003c\/th\u003e\n\u003ctd class=\"dlsr300-mono\"\u003eSR300\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eSKU\u003c\/th\u003e\n\u003ctd class=\"dlsr300-mono\"\u003ePST-17-777-2700\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eProduct Type\u003c\/th\u003e\n\u003ctd\u003eReplacement pool filter cartridge set\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003ctbody\u003e\n\u003ctr class=\"dlsr300-grp\"\u003e\u003cth colspan=\"2\" scope=\"colgroup\"\u003eFitment\u003c\/th\u003e\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eCompatible Series\u003c\/th\u003e\n\u003ctd\u003eSta-Rite System 3\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eCompatible Model\u003c\/th\u003e\n\u003ctd\u003eS7M120\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003ctbody\u003e\n\u003ctr class=\"dlsr300-grp\"\u003e\u003cth colspan=\"2\" scope=\"colgroup\"\u003eSet Contents\u003c\/th\u003e\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eCartridge Quantity\u003c\/th\u003e\n\u003ctd\u003e2\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eInner Cartridge\u003c\/th\u003e\n\u003ctd\u003eIncluded\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eOuter Cartridge\u003c\/th\u003e\n\u003ctd\u003eIncluded\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eFilter Media Grade\u003c\/th\u003e\n\u003ctd\u003e4 oz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003c\/div\u003e\n  \u003c\/section\u003e\n\n  \n  \u003csection class=\"dlsr300-section\"\u003e\n    \u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n    \u003cdiv class=\"dlsr300-faq\"\u003e\n      \u003cdiv class=\"dlsr300-faq-card\"\u003e\n\u003ch3\u003eWhich filter model does the SR300 set fit?\u003c\/h3\u003e\n\u003cp\u003eThis set is specified for the \u003cstrong\u003eSta-Rite System 3 S7M120\u003c\/strong\u003e. Confirm S7M120 on your filter tank label and match the existing inner and outer cartridge arrangement before ordering.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"dlsr300-faq-card\"\u003e\n\u003ch3\u003eWhat is included in this cartridge set?\u003c\/h3\u003e\n\u003cp\u003eThe Darlly SR300 set includes \u003cstrong\u003eone inner cartridge and one outer cartridge\u003c\/strong\u003e. The listing is for replacement cartridges; retain your compatible filter tank and its serviceable hardware.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"dlsr300-faq-card\"\u003e\n\u003ch3\u003eHow do I install the replacement cartridges?\u003c\/h3\u003e\n\u003cp\u003eFollow the Sta-Rite filter manual. Shut off the pump, isolate its power and release all filter pressure before opening the tank. Seat both cartridges as directed and inspect the tank seal and closure before restarting the system.\u003c\/p\u003e\n\u003c\/div\u003e\n    \u003c\/div\u003e\n  \u003c\/section\u003e\n  \n\n  \n  \u003csection class=\"dlsr300-cta\"\u003e\n    \u003cdiv\u003e\n      \u003ch2\u003eMatch Your System 3 Cartridge Set\u003c\/h2\u003e\n      \u003cp\u003eConfirm the S7M120 tank model, then order the Darlly SR300 inner and outer set together.\u003c\/p\u003e\n    \u003c\/div\u003e\n    \u003cul class=\"dlsr300-perks\"\u003e\n\u003cli\u003e\n\u003csvg class=\"dlsr300-ico\" viewbox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"1.75\" stroke-linecap=\"round\" stroke-linejoin=\"round\" aria-hidden=\"true\" focusable=\"false\"\u003e\u003cpath d=\"M20 6 9 17l-5-5\"\u003e\u003c\/path\u003e\u003c\/svg\u003eGenuine Darlly cartridges\u003c\/li\u003e\n\u003cli\u003e\n\u003csvg class=\"dlsr300-ico\" viewbox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"1.75\" stroke-linecap=\"round\" stroke-linejoin=\"round\" aria-hidden=\"true\" focusable=\"false\"\u003e\u003cpath d=\"M20 6 9 17l-5-5\"\u003e\u003c\/path\u003e\u003c\/svg\u003eInner and outer set\u003c\/li\u003e\n\u003cli\u003e\n\u003csvg class=\"dlsr300-ico\" viewbox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"1.75\" stroke-linecap=\"round\" stroke-linejoin=\"round\" aria-hidden=\"true\" focusable=\"false\"\u003e\u003cpath d=\"M20 6 9 17l-5-5\"\u003e\u003c\/path\u003e\u003c\/svg\u003eShips free from the USA\u003c\/li\u003e\n\u003cli\u003e\n\u003csvg class=\"dlsr300-ico\" viewbox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"1.75\" stroke-linecap=\"round\" stroke-linejoin=\"round\" aria-hidden=\"true\" focusable=\"false\"\u003e\u003cpath d=\"M20 6 9 17l-5-5\"\u003e\u003c\/path\u003e\u003c\/svg\u003eSpa techs on support\u003c\/li\u003e\n\u003c\/ul\u003e\n  \u003c\/section\u003e\n  \n\n\u003c\/div\u003e\n","brand":"Darlly Filtration","offers":[{"title":"Default Title","offer_id":50945325006913,"sku":"PST-17-777-2700","price":522.3,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0633\/1623\/0209\/files\/17-777-2700_XL.jpg?v=1793939064","url":"https:\/\/www.pstpoolsupplies.com\/products\/darlly-sr300-inner-and-outer-cartridge-set-for-sta-rite-system-3-s7m120","provider":"PST Pool Supplies","version":"1.0","type":"link"}