{"product_id":"no-8-filter-support-gravel-1-4-1-8-inch-50-lb","title":"No. 8 Pea Gravel Filter Support Media, 1\/4 × 1\/8 in., 50 lb Bag","description":"\u003cstyle\u003e\n  .atb-product-description {\n    --atb-teal: #198278;\n    --atb-teal-dark: #11675f;\n    --atb-orange: #e37c3f;\n    --atb-orange-dark: #af5b31;\n    --atb-navy: #123f46;\n    --atb-black: #202124;\n    --atb-gray: #5f6368;\n    --atb-light: #f5f8f8;\n    --atb-teal-light: #edf7f6;\n    --atb-orange-light: #fff5ef;\n    --atb-border: #d9e3e2;\n    --atb-white: #ffffff;\n    --atb-warning: #fff8e6;\n    --atb-warning-border: #e6b94f;\n    color: var(--atb-black);\n    font-family: inherit;\n    font-size: 16px;\n    line-height: 1.65;\n    margin: 0 auto;\n    max-width: 1000px;\n  }\n\n  .atb-product-description *,\n  .atb-product-description *::before,\n  .atb-product-description *::after {\n    box-sizing: border-box;\n  }\n\n  .atb-product-description h2,\n  .atb-product-description h3 {\n    color: 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var(--atb-teal);\n    border-radius: 50%;\n    color: var(--atb-white);\n    content: \"✓\";\n    display: inline-flex;\n    font-size: 12px;\n    font-weight: 900;\n    height: 18px;\n    justify-content: center;\n    left: 0;\n    position: absolute;\n    top: 4px;\n    width: 18px;\n  }\n\n  .atb-section {\n    margin: 30px 0;\n  }\n\n  .atb-section-title {\n    border-bottom: 3px solid var(--atb-orange);\n    display: inline-block;\n    margin-bottom: 17px;\n    padding-bottom: 7px;\n  }\n\n  .atb-layer-diagram {\n    border: 1px solid var(--atb-border);\n    border-radius: 12px;\n    margin: 24px 0;\n    overflow: hidden;\n  }\n\n  .atb-layer {\n    padding: 19px 21px;\n    text-align: center;\n  }\n\n  .atb-layer-water {\n    background: #dff5f3;\n    color: var(--atb-navy);\n  }\n\n  .atb-layer-sand {\n    background: #f5dfb9;\n    color: #624b28;\n  }\n\n  .atb-layer-gravel {\n    background: #d8d4cd;\n    color: #3f3b35;\n  }\n\n  .atb-layer-underdrain {\n    background: var(--atb-navy);\n    color: var(--atb-white);\n  }\n\n  .atb-layer strong {\n    display: block;\n    font-size: 17px;\n    margin-bottom: 3px;\n  }\n\n  .atb-layer span {\n    font-size: 14px;\n  }\n\n  .atb-spec-table,\n  .atb-quantity-table {\n    border: 1px solid var(--atb-border);\n    border-collapse: separate;\n    border-radius: 12px;\n    border-spacing: 0;\n    overflow: hidden;\n    width: 100%;\n  }\n\n  .atb-spec-table th,\n  .atb-spec-table td,\n  .atb-quantity-table th,\n  .atb-quantity-table td {\n    border-bottom: 1px solid var(--atb-border);\n    padding: 13px 15px;\n    text-align: left;\n    vertical-align: top;\n  }\n\n  .atb-spec-table th {\n    background: var(--atb-teal-light);\n    color: var(--atb-navy);\n    font-weight: 800;\n    width: 37%;\n  }\n\n  .atb-quantity-table thead th {\n    background: var(--atb-navy);\n    color: var(--atb-white);\n    font-weight: 800;\n  }\n\n  .atb-quantity-table tbody tr:nth-child(even) {\n    background: var(--atb-light);\n  }\n\n  .atb-spec-table tr:last-child th,\n  .atb-spec-table tr:last-child td,\n  .atb-quantity-table tr:last-child td {\n    border-bottom: 0;\n  }\n\n  .atb-installation-box {\n    background: var(--atb-orange-light);\n    border: 1px solid #efc8ad;\n    border-left: 5px solid var(--atb-orange);\n    border-radius: 12px;\n    margin: 24px 0;\n    padding: 21px;\n  }\n\n  .atb-installation-box h3 {\n    color: var(--atb-orange-dark);\n  }\n\n  .atb-box-label {\n    background: var(--atb-orange);\n    border-radius: 5px;\n    color: var(--atb-white);\n    display: inline-block;\n    font-size: 12px;\n    font-weight: 900;\n    letter-spacing: 0.05em;\n    margin-bottom: 10px;\n    padding: 4px 9px;\n    text-transform: uppercase;\n  }\n\n  .atb-quantity-box {\n    background: var(--atb-light);\n    border: 1px solid var(--atb-border);\n    border-radius: 12px;\n    margin: 24px 0;\n    padding: 21px;\n  }\n\n  .atb-formula {\n    background: var(--atb-teal-light);\n    border: 1px solid #b9dcd8;\n    border-radius: 9px;\n    color: var(--atb-navy);\n    font-size: 17px;\n    font-weight: 800;\n    margin: 15px 0;\n    padding: 15px;\n    text-align: center;\n  }\n\n  .atb-warning-box {\n    background: var(--atb-warning);\n    border: 1px solid var(--atb-warning-border);\n    border-left: 5px solid #c49115;\n    border-radius: 12px;\n    margin: 24px 0;\n    padding: 21px;\n  }\n\n  .atb-warning-box h3 {\n    color: #684b00;\n  }\n\n  .atb-warning-label {\n    background: #9a6b00;\n    border-radius: 5px;\n    color: var(--atb-white);\n    display: inline-block;\n    font-size: 12px;\n    font-weight: 900;\n    letter-spacing: 0.05em;\n    margin-bottom: 10px;\n    padding: 4px 9px;\n    text-transform: uppercase;\n  }\n\n  .atb-note {\n    background: var(--atb-teal-light);\n    border-left: 4px solid var(--atb-teal);\n    border-radius: 8px;\n    color: var(--atb-navy);\n    font-size: 14px;\n    margin-top: 15px;\n    padding: 14px 16px;\n  }\n\n  .atb-accordion {\n    border: 1px solid var(--atb-border);\n    border-radius: 10px;\n    margin-bottom: 10px;\n    overflow: hidden;\n  }\n\n  .atb-accordion summary {\n    align-items: center;\n    background: var(--atb-white);\n    color: var(--atb-navy);\n    cursor: pointer;\n    display: flex;\n    font-weight: 800;\n    justify-content: space-between;\n    list-style: none;\n    padding: 16px 18px;\n  }\n\n  .atb-accordion summary::-webkit-details-marker {\n    display: none;\n  }\n\n  .atb-accordion summary::after {\n    color: var(--atb-orange);\n    content: \"+\";\n    flex: 0 0 auto;\n    font-size: 25px;\n    font-weight: 500;\n    line-height: 1;\n    margin-left: 15px;\n  }\n\n  .atb-accordion[open] summary {\n    background: var(--atb-teal-light);\n  }\n\n  .atb-accordion[open] summary::after {\n    content: \"−\";\n  }\n\n  .atb-accordion-content {\n    border-top: 1px solid var(--atb-border);\n    padding: 16px 18px 2px;\n  }\n\n  .atb-support-box {\n    background: var(--atb-navy);\n    border-radius: 14px;\n    color: var(--atb-white);\n    margin-top: 30px;\n    padding: 25px;\n    text-align: center;\n  }\n\n  .atb-support-box h3 {\n    color: var(--atb-white);\n    font-size: 23px;\n    margin-bottom: 8px;\n  }\n\n  .atb-support-box p {\n    margin-bottom: 0;\n  }\n\n  .atb-brand-line {\n    color: #d6ecea;\n    font-size: 14px;\n    margin-top: 9px !important;\n  }\n\n  @media (max-width: 760px) {\n    .atb-stat-grid {\n      grid-template-columns: repeat(2, minmax(0, 1fr));\n    }\n\n    .atb-grid {\n      grid-template-columns: 1fr;\n    }\n  }\n\n  @media (max-width: 520px) {\n    .atb-product-hero {\n      padding: 19px;\n    }\n\n    .atb-spec-table,\n    .atb-spec-table tbody,\n    .atb-spec-table tr,\n    .atb-spec-table th,\n    .atb-spec-table td {\n      display: block;\n      width: 100%;\n    }\n\n    .atb-spec-table th {\n      border-bottom: 0;\n      padding-bottom: 5px;\n    }\n\n    .atb-spec-table td {\n      padding-top: 5px;\n    }\n\n    .atb-ordering-header {\n      align-items: flex-start;\n      font-size: 15px;\n    }\n  }\n\u003c\/style\u003e\n\n\u003cdiv class=\"atb-product-description\"\u003e\n\n  \u003cdiv class=\"atb-ordering-alert\" role=\"alert\" aria-label=\"Important ordering information\"\u003e\n    \u003cdiv class=\"atb-ordering-header\"\u003e\n      \u003cspan class=\"atb-alert-icon\" aria-hidden=\"true\"\u003e!\u003c\/span\u003e\n      Important Ordering Information\n    \u003c\/div\u003e\n\n    \u003cdiv class=\"atb-ordering-body\"\u003e\n      \u003cp\u003e\n        \u003cstrong\u003e\n          This listing is for one 50 lb bag of No. 8 filter support gravel\n          sized from approximately 1\/8 inch to 1\/4 inch.\n        \u003c\/strong\u003e\n      \u003c\/p\u003e\n\n      \u003cp\u003e\n        This is support gravel, not No. 20 filtration sand. Use it only in\n        filters whose manufacturer specifically requires a gravel support\n        layer. Confirm the required media size and total weight before\n        ordering.\n      \u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003csection class=\"atb-product-hero\"\u003e\n    \u003cspan class=\"atb-eyebrow\"\u003e\n      Support Media for Layered Pool Sand Filters\n    \u003c\/span\u003e\n\n    \u003ch2\u003e\n      No. 8 Pea Gravel Filter Support Media, 1\/4 × 1\/8 Inch, 50 lb Bag\n    \u003c\/h2\u003e\n\n    \u003cp\u003e\n      No. 8 pea gravel is coarse filter support media designed for compatible\n      commercial, institutional and high-capacity swimming pool sand filters.\n      It is installed as the lower layer of the media bed, beneath the finer\n      filtration sand.\n    \u003c\/p\u003e\n\n    \u003cp\u003e\n      The gravel helps support the sand bed, surrounds the filter laterals or\n      underdrain assembly and promotes even movement of water through the\n      bottom of the filter. Each bag contains 50 pounds of gravel sized between\n      approximately 1\/8 inch and 1\/4 inch.\n    \u003c\/p\u003e\n\n    \u003cdiv class=\"atb-badge-row\"\u003e\n      \u003cspan class=\"atb-badge atb-badge-teal\"\u003e\n        1\/4 × 1\/8 Inch Media\n      \u003c\/span\u003e\n\n      \u003cspan class=\"atb-badge atb-badge-orange\"\u003e\n        50 lb Bag\n      \u003c\/span\u003e\n    \u003c\/div\u003e\n  \u003c\/section\u003e\n\n  \u003cdiv class=\"atb-stat-grid\"\u003e\n    \u003cdiv class=\"atb-stat\"\u003e\n      \u003cstrong\u003e50 lb\u003c\/strong\u003e\n      \u003cspan\u003eBag Weight\u003c\/span\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv class=\"atb-stat\"\u003e\n      \u003cstrong\u003eNo. 8\u003c\/strong\u003e\n      \u003cspan\u003eSupport Gravel\u003c\/span\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv class=\"atb-stat\"\u003e\n      \u003cstrong\u003e1\/8–1\/4 in.\u003c\/strong\u003e\n      \u003cspan\u003eMedia Size Range\u003c\/span\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv class=\"atb-stat\"\u003e\n      \u003cstrong\u003eBase Layer\u003c\/strong\u003e\n      \u003cspan\u003eFilter Application\u003c\/span\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"atb-grid\"\u003e\n    \u003cdiv class=\"atb-card\"\u003e\n      \u003cdiv class=\"atb-card-icon\" aria-hidden=\"true\"\u003e✓\u003c\/div\u003e\n\n      \u003ch3\u003eWhat Support Gravel Does\u003c\/h3\u003e\n\n      \u003cul class=\"atb-check-list\"\u003e\n        \u003cli\u003eForms the lower layer of a specified filter-media bed\u003c\/li\u003e\n        \u003cli\u003eSupports the finer filtration sand above it\u003c\/li\u003e\n        \u003cli\u003eSurrounds compatible laterals and underdrain components\u003c\/li\u003e\n        \u003cli\u003eHelps distribute water through the bottom of the media bed\u003c\/li\u003e\n        \u003cli\u003eHelps reduce fine media migration toward the underdrain\u003c\/li\u003e\n      \u003c\/ul\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv class=\"atb-card\"\u003e\n      \u003cdiv class=\"atb-card-icon\" aria-hidden=\"true\"\u003e◎\u003c\/div\u003e\n\n      \u003ch3\u003eCommon Applications\u003c\/h3\u003e\n\n      \u003cul class=\"atb-check-list\"\u003e\n        \u003cli\u003eCommercial swimming pool sand filters\u003c\/li\u003e\n        \u003cli\u003eInstitutional and municipal aquatic facilities\u003c\/li\u003e\n        \u003cli\u003eHigh-capacity layered-media filtration systems\u003c\/li\u003e\n        \u003cli\u003eComplete filter-media replacement projects\u003c\/li\u003e\n        \u003cli\u003eFilters specifically requiring 1\/4 × 1\/8 support gravel\u003c\/li\u003e\n      \u003c\/ul\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003csection class=\"atb-section\"\u003e\n    \u003ch2 class=\"atb-section-title\"\u003eHow the Filter Media Layers Work\u003c\/h2\u003e\n\n    \u003cdiv class=\"atb-layer-diagram\" role=\"img\" aria-label=\"Diagram showing pool water above filtration sand, support gravel and filter underdrain\"\u003e\n      \u003cdiv class=\"atb-layer atb-layer-water\"\u003e\n        \u003cstrong\u003ePool Water Enters the Filter\u003c\/strong\u003e\n        \u003cspan\u003eWater is distributed across the top of the media bed.\u003c\/span\u003e\n      \u003c\/div\u003e\n\n      \u003cdiv class=\"atb-layer atb-layer-sand\"\u003e\n        \u003cstrong\u003eNo. 20 Filtration Sand\u003c\/strong\u003e\n        \u003cspan\u003e\n          The upper media layer captures suspended dirt and debris.\n        \u003c\/span\u003e\n      \u003c\/div\u003e\n\n      \u003cdiv class=\"atb-layer atb-layer-gravel\"\u003e\n        \u003cstrong\u003eNo. 8 Support Gravel\u003c\/strong\u003e\n        \u003cspan\u003e\n          The lower gravel layer supports the sand and surrounds the\n          underdrain.\n        \u003c\/span\u003e\n      \u003c\/div\u003e\n\n      \u003cdiv class=\"atb-layer atb-layer-underdrain\"\u003e\n        \u003cstrong\u003eLaterals or Underdrain System\u003c\/strong\u003e\n        \u003cspan\u003e\n          Filtered water is collected and directed out of the vessel.\n        \u003c\/span\u003e\n      \u003c\/div\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv class=\"atb-note\"\u003e\n      The number, size and depth of media layers vary by filter design. Follow\n      the exact loading sequence and quantities specified by the filter\n      manufacturer.\n    \u003c\/div\u003e\n  \u003c\/section\u003e\n\n  \u003csection class=\"atb-section\"\u003e\n    \u003ch2 class=\"atb-section-title\"\u003eProduct Specifications\u003c\/h2\u003e\n\n    \u003ctable class=\"atb-spec-table\"\u003e\n      \u003ctbody\u003e\n        \u003ctr\u003e\n          \u003cth scope=\"row\"\u003eProduct Name\u003c\/th\u003e\n          \u003ctd\u003eNo. 8 Pea Gravel Filter Support Media\u003c\/td\u003e\n        \u003c\/tr\u003e\n\n        \u003ctr\u003e\n          \u003cth scope=\"row\"\u003eProduct Type\u003c\/th\u003e\n          \u003ctd\u003eCoarse support gravel for compatible filtration systems\u003c\/td\u003e\n        \u003c\/tr\u003e\n\n        \u003ctr\u003e\n          \u003cth scope=\"row\"\u003eMedia Designation\u003c\/th\u003e\n          \u003ctd\u003eNo. 8 support gravel\u003c\/td\u003e\n        \u003c\/tr\u003e\n\n        \u003ctr\u003e\n          \u003cth scope=\"row\"\u003eNominal Size Range\u003c\/th\u003e\n          \u003ctd\u003e1\/8 inch to 1\/4 inch\u003c\/td\u003e\n        \u003c\/tr\u003e\n\n        \u003ctr\u003e\n          \u003cth scope=\"row\"\u003eBag Weight\u003c\/th\u003e\n          \u003ctd\u003e50 lb\u003c\/td\u003e\n        \u003c\/tr\u003e\n\n        \u003ctr\u003e\n          \u003cth scope=\"row\"\u003eQuantity Included\u003c\/th\u003e\n          \u003ctd\u003eOne bag\u003c\/td\u003e\n        \u003c\/tr\u003e\n\n        \u003ctr\u003e\n          \u003cth scope=\"row\"\u003ePosition in Filter\u003c\/th\u003e\n          \u003ctd\u003eLower support layer beneath the filtration sand\u003c\/td\u003e\n        \u003c\/tr\u003e\n\n        \u003ctr\u003e\n          \u003cth scope=\"row\"\u003ePrimary Application\u003c\/th\u003e\n          \u003ctd\u003e\n            Compatible commercial, institutional and high-capacity sand\n            filters\n          \u003c\/td\u003e\n        \u003c\/tr\u003e\n\n        \u003ctr\u003e\n          \u003cth scope=\"row\"\u003eCompatible Upper Media\u003c\/th\u003e\n          \u003ctd\u003e\n            No. 20 silica sand or other media specifically approved by the\n            filter manufacturer\n          \u003c\/td\u003e\n        \u003c\/tr\u003e\n\n        \u003ctr\u003e\n          \u003cth scope=\"row\"\u003eInstallation Requirement\u003c\/th\u003e\n          \u003ctd\u003e\n            Use only when the filter manual specifies support gravel of this\n            size\n          \u003c\/td\u003e\n        \u003c\/tr\u003e\n\n        \u003ctr\u003e\n          \u003cth scope=\"row\"\u003eNot a Substitute For\u003c\/th\u003e\n          \u003ctd\u003e\n            No. 20 filtration sand, cartridge elements or diatomaceous-earth\n            media\n          \u003c\/td\u003e\n        \u003c\/tr\u003e\n\n        \u003ctr\u003e\n          \u003cth scope=\"row\"\u003eNot Intended For\u003c\/th\u003e\n          \u003ctd\u003e\n            Decorative landscaping, playgrounds or general construction use\n          \u003c\/td\u003e\n        \u003c\/tr\u003e\n      \u003c\/tbody\u003e\n    \u003c\/table\u003e\n  \u003c\/section\u003e\n\n  \u003csection class=\"atb-quantity-box\"\u003e\n    \u003ch3\u003eHow Many 50 lb Bags Do I Need?\u003c\/h3\u003e\n\n    \u003cp\u003e\n      Find the required support-gravel weight in the filter manual,\n      manufacturer data sheet or approved project specification. Divide that\n      amount by 50 and round up to the next full bag when necessary.\n    \u003c\/p\u003e\n\n    \u003cdiv class=\"atb-formula\"\u003e\n      Required Gravel Weight ÷ 50 = Number of Bags to Purchase\n    \u003c\/div\u003e\n\n    \u003ctable class=\"atb-quantity-table\"\u003e\n      \u003cthead\u003e\n        \u003ctr\u003e\n          \u003cth scope=\"col\"\u003eRequired Support Gravel\u003c\/th\u003e\n          \u003cth scope=\"col\"\u003e50 lb Bags to Purchase\u003c\/th\u003e\n        \u003c\/tr\u003e\n      \u003c\/thead\u003e\n\n      \u003ctbody\u003e\n        \u003ctr\u003e\n          \u003ctd\u003e50 lb\u003c\/td\u003e\n          \u003ctd\u003e1 bag\u003c\/td\u003e\n        \u003c\/tr\u003e\n\n        \u003ctr\u003e\n          \u003ctd\u003e100 lb\u003c\/td\u003e\n          \u003ctd\u003e2 bags\u003c\/td\u003e\n        \u003c\/tr\u003e\n\n        \u003ctr\u003e\n          \u003ctd\u003e150 lb\u003c\/td\u003e\n          \u003ctd\u003e3 bags\u003c\/td\u003e\n        \u003c\/tr\u003e\n\n        \u003ctr\u003e\n          \u003ctd\u003e200 lb\u003c\/td\u003e\n          \u003ctd\u003e4 bags\u003c\/td\u003e\n        \u003c\/tr\u003e\n\n        \u003ctr\u003e\n          \u003ctd\u003e250 lb\u003c\/td\u003e\n          \u003ctd\u003e5 bags\u003c\/td\u003e\n        \u003c\/tr\u003e\n\n        \u003ctr\u003e\n          \u003ctd\u003e300 lb\u003c\/td\u003e\n          \u003ctd\u003e6 bags\u003c\/td\u003e\n        \u003c\/tr\u003e\n\n        \u003ctr\u003e\n          \u003ctd\u003e350 lb\u003c\/td\u003e\n          \u003ctd\u003e7 bags\u003c\/td\u003e\n        \u003c\/tr\u003e\n\n        \u003ctr\u003e\n          \u003ctd\u003e500 lb\u003c\/td\u003e\n          \u003ctd\u003e10 bags\u003c\/td\u003e\n        \u003c\/tr\u003e\n\n        \u003ctr\u003e\n          \u003ctd\u003e600 lb\u003c\/td\u003e\n          \u003ctd\u003e12 bags\u003c\/td\u003e\n        \u003c\/tr\u003e\n\n        \u003ctr\u003e\n          \u003ctd\u003e700 lb\u003c\/td\u003e\n          \u003ctd\u003e14 bags\u003c\/td\u003e\n        \u003c\/tr\u003e\n\n        \u003ctr\u003e\n          \u003ctd\u003e1,000 lb\u003c\/td\u003e\n          \u003ctd\u003e20 bags\u003c\/td\u003e\n        \u003c\/tr\u003e\n\n        \u003ctr\u003e\n          \u003ctd\u003e2,000 lb\u003c\/td\u003e\n          \u003ctd\u003e40 bags\u003c\/td\u003e\n        \u003c\/tr\u003e\n      \u003c\/tbody\u003e\n    \u003c\/table\u003e\n\n    \u003cdiv class=\"atb-note\"\u003e\n      \u003cstrong\u003eExample:\u003c\/strong\u003e\n      A filter requiring 275 pounds of support gravel requires six 50-pound\n      bags to provide enough material. Add only the specified 275 pounds and\n      retain or dispose of any unused material appropriately.\n    \u003c\/div\u003e\n  \u003c\/section\u003e\n\n  \u003csection class=\"atb-installation-box\"\u003e\n    \u003cspan class=\"atb-box-label\"\u003eInstallation Guidance\u003c\/span\u003e\n\n    \u003ch3\u003eSupport Gravel Is Installed Before the Filter Sand\u003c\/h3\u003e\n\n    \u003cp\u003e\n      Shut down the circulation system, isolate the filter and fully relieve\n      internal pressure before opening the vessel. Follow the filter\n      manufacturer’s safety, access and media-loading instructions.\n    \u003c\/p\u003e\n\n    \u003cul class=\"atb-check-list\"\u003e\n      \u003cli\u003eRemove the old media when performing a complete media change\u003c\/li\u003e\n      \u003cli\u003eInspect laterals, hubs, strainers and underdrain components\u003c\/li\u003e\n      \u003cli\u003eReplace damaged or missing internal components before loading\u003c\/li\u003e\n      \u003cli\u003eVerify that the filter vessel is clean and free of debris\u003c\/li\u003e\n      \u003cli\u003eAdd gravel slowly to avoid damaging internal components\u003c\/li\u003e\n      \u003cli\u003eSpread the support layer evenly around the underdrain\u003c\/li\u003e\n      \u003cli\u003eAdd only the specified gravel depth or total weight\u003c\/li\u003e\n      \u003cli\u003eInstall the filtration sand above the completed gravel layer\u003c\/li\u003e\n      \u003cli\u003eFollow the required backwash and rinse startup procedure\u003c\/li\u003e\n    \u003c\/ul\u003e\n\n    \u003cdiv class=\"atb-note\"\u003e\n      Do not pour the filtration sand into the vessel before completing the\n      required gravel support layer. Reversing the media order can interfere\n      with water distribution and may allow finer media to reach the\n      underdrain.\n    \u003c\/div\u003e\n  \u003c\/section\u003e\n\n  \u003csection class=\"atb-warning-box\"\u003e\n    \u003cspan class=\"atb-warning-label\"\u003eCompatibility Warning\u003c\/span\u003e\n\n    \u003ch3\u003eNot Every Sand Filter Uses Support Gravel\u003c\/h3\u003e\n\n    \u003cp\u003e\n      Many residential sand filters are filled entirely with No. 20 silica\n      sand and do not require a separate gravel layer. Other commercial and\n      high-capacity filters require a specific combination of sand and support\n      gravel.\n    \u003c\/p\u003e\n\n    \u003cp\u003e\n      Do not add gravel solely because the vessel is large or because another\n      filter uses it. Confirm the exact filter model, media specification,\n      gravel size, gravel weight, sand weight and loading sequence before\n      installation.\n    \u003c\/p\u003e\n  \u003c\/section\u003e\n\n  \u003csection class=\"atb-section\"\u003e\n    \u003ch2 class=\"atb-section-title\"\u003eFrequently Asked Questions\u003c\/h2\u003e\n\n    \u003cdetails class=\"atb-accordion\"\u003e\n      \u003csummary\u003e\n        What is No. 8 filter support gravel used for?\n      \u003c\/summary\u003e\n\n      \u003cdiv class=\"atb-accordion-content\"\u003e\n        \u003cp\u003e\n          It is installed as the lower layer in compatible layered-media sand\n          filters. The gravel supports the finer sand above it, surrounds the\n          underdrain or lateral system and helps distribute water through the\n          bottom of the filter bed.\n        \u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails class=\"atb-accordion\"\u003e\n      \u003csummary\u003e\n        Is this the same product as No. 20 filter sand?\n      \u003c\/summary\u003e\n\n      \u003cdiv class=\"atb-accordion-content\"\u003e\n        \u003cp\u003e\n          No. No. 8 support gravel is much coarser and is used beneath the\n          filtration sand. No. 20 silica sand is the finer upper media layer\n          that performs most of the particle filtration.\n        \u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails class=\"atb-accordion\"\u003e\n      \u003csummary\u003e\n        What does 1\/4 × 1\/8 inch mean?\n      \u003c\/summary\u003e\n\n      \u003cdiv class=\"atb-accordion-content\"\u003e\n        \u003cp\u003e\n          It identifies the nominal gravel particle range. The media is sized\n          between approximately 1\/8 inch and 1\/4 inch for compatible filter\n          support-layer applications.\n        \u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails class=\"atb-accordion\"\u003e\n      \u003csummary\u003e\n        How much gravel is included?\n      \u003c\/summary\u003e\n\n      \u003cdiv class=\"atb-accordion-content\"\u003e\n        \u003cp\u003e\n          This listing includes one 50-pound bag. Increase the order quantity\n          to purchase the number of bags required by the filter specification.\n        \u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails class=\"atb-accordion\"\u003e\n      \u003csummary\u003e\n        Does every commercial sand filter require support gravel?\n      \u003c\/summary\u003e\n\n      \u003cdiv class=\"atb-accordion-content\"\u003e\n        \u003cp\u003e\n          No. Requirements vary by manufacturer and filter design. Some\n          commercial filters specify a sand-and-gravel media bed, while others\n          use sand alone or a different layered-media arrangement.\n        \u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails class=\"atb-accordion\"\u003e\n      \u003csummary\u003e\n        Can this be used in a residential pool sand filter?\n      \u003c\/summary\u003e\n\n      \u003cdiv class=\"atb-accordion-content\"\u003e\n        \u003cp\u003e\n          Only when the residential filter’s manufacturer specifically calls\n          for a 1\/4-inch by 1\/8-inch support-gravel layer. Do not add it to a\n          filter designed to use No. 20 sand only.\n        \u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails class=\"atb-accordion\"\u003e\n      \u003csummary\u003e\n        Which media is installed first?\n      \u003c\/summary\u003e\n\n      \u003cdiv class=\"atb-accordion-content\"\u003e\n        \u003cp\u003e\n          In a filter designed for this layered arrangement, the support gravel\n          is installed first around the underdrain. The finer filtration sand\n          is then installed above the completed gravel layer.\n        \u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails class=\"atb-accordion\"\u003e\n      \u003csummary\u003e\n        Can I use ordinary landscaping pea gravel?\n      \u003c\/summary\u003e\n\n      \u003cdiv class=\"atb-accordion-content\"\u003e\n        \u003cp\u003e\n          Ordinary landscaping gravel should not be substituted. Filter media\n          must meet the size, cleanliness, screening and material requirements\n          specified by the filter manufacturer or project engineer.\n        \u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails class=\"atb-accordion\"\u003e\n      \u003csummary\u003e\n        How do I calculate the number of bags?\n      \u003c\/summary\u003e\n\n      \u003cdiv class=\"atb-accordion-content\"\u003e\n        \u003cp\u003e\n          Divide the required gravel weight by 50. Round up to the next whole\n          bag when the result contains a fraction. Add only the exact amount\n          specified for the filter.\n        \u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails class=\"atb-accordion\"\u003e\n      \u003csummary\u003e\n        Should the filter be backwashed after installing new media?\n      \u003c\/summary\u003e\n\n      \u003cdiv class=\"atb-accordion-content\"\u003e\n        \u003cp\u003e\n          Follow the manufacturer’s startup procedure. Most sand-filter media\n          changes require an initial backwash and rinse before the filter is\n          returned to normal filtration service.\n        \u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n  \u003c\/section\u003e\n\n  \u003csection class=\"atb-support-box\"\u003e\n    \u003ch3\u003eNot Sure Whether Your Filter Requires Support Gravel?\u003c\/h3\u003e\n\n    \u003cp\u003e\n      Locate the filter manufacturer, complete model number and media-loading\n      specification before ordering. Commercial filters may require separate\n      gravel and sand weights.\n    \u003c\/p\u003e\n\n    \u003cp class=\"atb-brand-line\"\u003e\n      Aqua Terra Backyard | Pool Equipment, Parts and Backyard Expertise\n    \u003c\/p\u003e\n  \u003c\/section\u003e\n\n\u003c\/div\u003e","brand":"Generic","offers":[{"title":"Default Title","offer_id":52545693647122,"sku":"SNDFGRIT50","price":16.5,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0733\/2279\/1186\/files\/No._8_pea_gravel_filter_support_media_sized_1_4_by_1_8_inch_in_a_50_pound_bag.png?v=1784922593","url":"https:\/\/www.aquaterrabackyard.com\/products\/no-8-filter-support-gravel-1-4-1-8-inch-50-lb","provider":"Aqua Terra Backyard","version":"1.0","type":"link"}