{"id":3703,"date":"2025-08-07T12:53:43","date_gmt":"2025-08-07T17:53:43","guid":{"rendered":"https:\/\/sumiowater.com\/en\/?page_id=3703"},"modified":"2025-08-07T14:07:21","modified_gmt":"2025-08-07T19:07:21","slug":"multibloc-gravity-filter-underdrain","status":"publish","type":"page","link":"https:\/\/sumiowater.com\/en\/multibloc-gravity-filter-underdrain\/","title":{"rendered":"Multiblock\u00ae Gravity Filter Underdrain"},"content":{"rendered":"\n<p>The MULTIBLOCK\u00ae gravity filter underdrain system utilizes compensating lateral technology through a design of continuous, interlocking laterals formed from structural high-density polyethylene (HDPE). This configuration provides even hydraulic distribution for consistent performance in both service and backwash operations in water treatment filters.<\/p>\n\n\n\n<p>For any water treatment facility relying on <strong>gravity filters, the underdrains<\/strong> are the backbone of the system, responsible for ensuring reliable water collection and efficient backwashing. Whether undergoing <strong>new construction, expansion, or rehabilitation,<\/strong> the performance of these components is paramount.<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"325\" height=\"278\" src=\"https:\/\/sumiowater.com\/en\/wp-content\/uploads\/sites\/5\/2025\/08\/image.png\" alt=\"Multibloc Underdrain System\" class=\"wp-image-3705\" srcset=\"https:\/\/sumiowater.com\/en\/wp-content\/uploads\/sites\/5\/2025\/08\/image.png 325w, https:\/\/sumiowater.com\/en\/wp-content\/uploads\/sites\/5\/2025\/08\/image-300x257.png 300w\" sizes=\"auto, (max-width: 325px) 100vw, 325px\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">What is the MULTIBLOCK\u00ae Gravity Filter Underdrain System?<\/h2>\n\n\n\n<p>The MULTIBLOCK\u00ae system is a modular underdrain composed of high-strength, interlocking blocks. These blocks are joined on-site using a simple <strong>snap-together construction<\/strong> to form robust, continuous laterals. Each block is manufactured from lightweight, corrosion-proof structural foam HDPE (High-Density Polyethylene) and is certified to <strong>NSF\u00ae Standard 61<\/strong> for use in potable water applications.<\/p>\n\n\n\n<p>The system&#8217;s core strength lies in its compensating orifice design. This hydraulic engineering ensures that filtered water is collected evenly across the entire filter bed and that backwash air and water are distributed with exceptional uniformity, keeping filter media clean and performing at its peak.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Key Features and Core Benefits of Multiblock Gravity Filter Underdrains<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Superior Hydraulic Performance:<\/strong> A dual-lateral design with compensating flow orifices guarantees uniform distribution during both filtering and backwashing cycles, eliminating dead zones and maximizing filter efficiency.<\/li>\n\n\n\n<li><strong>Simplified, Robust Installation:<\/strong> The lightweight blocks feature a unique gasket seal that eliminates the common issues of o-ring rolling and the need for lubrication during assembly. This provides a more positive, reliable seal and simplifies the installation process.<\/li>\n\n\n\n<li><strong>Durable, Corrosion-Proof Construction:<\/strong> Made from structural foam HDPE, MULTIBLOCK\u00ae underdrains are immune to corrosion and designed to withstand a design loading of 850 psf and a downward force of 1,400 psf, ensuring a long, low-maintenance service life.<\/li>\n\n\n\n<li><strong>Proven and Tested:<\/strong> The MULTIBLOCK\u00ae design has been rigorously validated through extensive hydraulic and structural testing in dedicated facilities and test flumes, verifying the strength and performance of every component.<\/li>\n\n\n\n<li><strong>Versatile Applications:<\/strong> The system is adaptable to conventional concrete <strong>gravity filter<\/strong> cells.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Advanced Media Support: Tailored for Your Application<\/h2>\n\n\n\n<p>The MULTIBLOCK\u00ae system offers a complete range of media support options, allowing engineers to select the perfect solution for any project requirement, from traditional gravel beds to advanced direct retention plates.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Laser Shield\u2122: The Premium Direct Media Retention Solution<\/h3>\n\n\n\n<p>For applications demanding direct media retention without compromising performance, the Laser Shield\u2122 is the state-of-the-art choice.<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"640\" height=\"348\" src=\"https:\/\/sumiowater.com\/en\/wp-content\/uploads\/sites\/5\/2025\/08\/image-1.png\" alt=\"\" class=\"wp-image-3722\" style=\"width:382px;height:auto\" srcset=\"https:\/\/sumiowater.com\/en\/wp-content\/uploads\/sites\/5\/2025\/08\/image-1.png 640w, https:\/\/sumiowater.com\/en\/wp-content\/uploads\/sites\/5\/2025\/08\/image-1-300x163.png 300w\" sizes=\"auto, (max-width: 640px) 100vw, 640px\" \/><\/figure>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Ultra-Low Profile:<\/strong> At less than a tenth of an inch thick (&lt;0.1 inches), it saves valuable filter depth compared to porous plate designs.<\/li>\n\n\n\n<li><strong>Minimal Fouling Potential:<\/strong> The stainless-steel, open-slot design has up to 200 times less open surface area than porous bead designs, drastically reducing the potential for biological or chemical fouling.<\/li>\n\n\n\n<li><strong>Superior Cleanability:<\/strong> Should any fouling occur, the open slots are easily and effectively cleaned, a significant advantage over porous structures.<\/li>\n\n\n\n<li><strong>Application:<\/strong> Ideal for media with an effective size of 0.20 mm and larger, with precise 0.008\u201d slot openings.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">MULTIBLOCK\u00ae Shields: Reliable HDPE Media Retention<\/h3>\n\n\n\n<p>When project specifications call for a porous bead design, we provide factory-installed HDPE media retaining shields. The <strong>MS-500 Shield<\/strong> is designed for media larger than 0.45 mm, while the <strong>MS-250 Shield<\/strong> is suited for finer, mixed-media applications.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Traditional Gravel Support<\/h3>\n\n\n\n<p>For systems utilizing a gravel support bed, MULTIBLOCK\u00ae underdrains are designed to match the application perfectly. When air scour is required, the system can incorporate a reverse-graded bed or an in-bed air wash grid located at the media-gravel interface to achieve the widest range of air and water rates.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Unmatched Backwash Performance with MULTIWASH\u00ae Integration<\/h2>\n\n\n\n<p>When coupled with the proven <strong>MULTIWASH\u00ae baffled trough system<\/strong>, MULTIBLOCK\u00ae underdrains provide virtually unlimited and sustained simultaneous air and water backwashing capabilities. This powerful combination, which has benefitted hundreds of installations, ensures the most aggressive and effective media cleaning, leading to longer filter runs and superior performance.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Technical Specifications at a Glance<\/h2>\n\n\n\n<figure class=\"wp-block-table is-style-regular\"><table><thead><tr><th>Parameter<\/th><th>Value<\/th><\/tr><\/thead><tbody><tr><td><strong>Filtering Operation<\/strong><\/td><td>2\u221210\u00a0gpm\/ft<sup>2<\/sup><\/td><\/tr><tr><td><strong>Water Only Backwashing<\/strong><\/td><td>5\u221225\u00a0gpm\/ft<sup>2<\/sup><\/td><\/tr><tr><td><strong>Air Scour Only<\/strong><\/td><td>2\u22125\u00a0scfm\/ft<sup>2<\/sup><\/td><\/tr><tr><td><strong>Combined Air\/Water Backwash<\/strong><\/td><td>5\u00a0gpm\/ft<sup>2<\/sup>\u00a0water\u00a0and\u00a03\u00a0scfm\/ft<sup>2<\/sup>\u00a0air<\/td><\/tr><tr><td><strong>Nominal Block Dimensions<\/strong><\/td><td>11&#8243;&nbsp;W\u00d712&#8243;&nbsp;H\u00d736&#8243;&nbsp;L<\/td><\/tr><tr><td><strong>Installation Tolerance<\/strong><\/td><td>\u00b11\/8&#8243;<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">Frequently Asked Questions (FAQ)<\/h2>\n\n\n\n<p><strong>Q: What are the dimensions of a MULTIBLOCK\u00ae lateral?<\/strong> A: A single block is nominally 11\u201d wide x 12\u201d high x 36\u201d long. Blocks are joined to form laterals that can extend up to 50 feet from the central <a href=\"https:\/\/en.wikipedia.org\/wiki\/Flume\">flume<\/a>.<\/p>\n\n\n\n<p><strong>Q: Why is a gasket used between blocks instead of an O-ring?<\/strong> A: The flat gasket is simpler to install, held in place by an adhesive backing, and compresses to create a highly effective seal. This design eliminates the need for lubricant and prevents the common problem of O-rings rolling out of their groove during assembly.<\/p>\n\n\n\n<p><strong>Q: What makes the Laser Shield\u2122 so effective against fouling?<\/strong> A: Its effectiveness comes from three key features:<\/p>\n\n\n\n<ol start=\"1\" class=\"wp-block-list\">\n<li><strong>Low Profile:<\/strong> The plate is only 0.06\u201d thick, preventing depth fouling.<\/li>\n\n\n\n<li><strong>Minimal Surface Area:<\/strong> It has only 16&nbsp;in2 of open surface area per square foot, compared to as much as 3,000&nbsp;in2 for porous bead designs, leaving far less area for fouling to occur.<\/li>\n\n\n\n<li><strong>Hydraulic Control:<\/strong> The total slot area is greater than the underdrain\u2019s final distribution orifices, meaning flow is controlled by the underdrain itself, not the shield.<\/li>\n<\/ol>\n\n\n\n<p><strong>Q: What components do we provide versus the installer?<\/strong> A: We provide the underdrain blocks, sealing gaskets, anchors, end caps, and, if required, the Laser Shield\u2122 retainer, flume bridges, and air headers. The installing contractor is responsible for providing the grout and all labor for assembly and installation.<\/p>\n\n\n\n<p><strong>Q: Is the MULTIBLOCK\u00ae system considered a &#8220;Base Bid&#8221; standard?<\/strong> A: Yes, due to its proven track record and reliability, the MULTIBLOCK\u00ae system is often specified as the Base Bid equipment on major water treatment projects. Alternate suppliers must undergo a rigorous prequalification process to demonstrate their equipment provides comparable or superior performance, quality, and features<\/p>\n\n\n\n<div class=\"wp-block-uagb-separator uagb-block-0ac25e85 wp-block-uagb-separator--icon\"><div class=\"uagb-separator-spacing-wrapper\"><div class=\"wp-block-uagb-separator__inner\" style=\"--my-background-image:\"><div class=\"wp-block-uagb-separator-element\"><svg xmlns=\"https:\/\/www.w3.org\/2000\/svg\" viewBox=\"0 0 384 512\"><path d=\"M16 319.1C16 245.9 118.3 89.43 166.9 19.3C179.2 1.585 204.8 1.585 217.1 19.3C265.7 89.43 368 245.9 368 319.1C368 417.2 289.2 496 192 496C94.8 496 16 417.2 16 319.1zM112 319.1C112 311.2 104.8 303.1 96 303.1C87.16 303.1 80 311.2 80 319.1C80 381.9 130.1 432 192 432C200.8 432 208 424.8 208 416C208 407.2 200.8 400 192 400C147.8 400 112 364.2 112 319.1z\"><\/path><\/svg><\/div><\/div><\/div><\/div>\n\n\n\n<h4 class=\"wp-block-heading\" style=\"padding-top:0;padding-bottom:0\">More Info<\/h4>\n\n\n\n<div class=\"wp-block-group is-nowrap is-layout-flex wp-container-core-group-is-layout-3ef57df4 wp-block-group-is-layout-flex\" style=\"padding-top:var(--wp--preset--spacing--xxx-small);padding-bottom:var(--wp--preset--spacing--xxx-small)\">\n<div class=\"wp-block-uagb-buttons uagb-buttons__outer-wrap uagb-btn__default-btn uagb-btn-tablet__default-btn uagb-btn-mobile__default-btn uagb-block-100626e2\"><div class=\"uagb-buttons__wrap uagb-buttons-layout-wrap \">\n<div class=\"wp-block-uagb-buttons-child uagb-buttons__outer-wrap uagb-block-57ffe7a7 wp-block-button\"><div class=\"uagb-button__wrapper\"><a class=\"uagb-buttons-repeater wp-block-button__link\" aria-label=\"\" href=\"https:\/\/sumiowater.com\/en\/water-filtration\/multimedia-filters-commercial\/\" rel=\"follow noopener\" target=\"_blank\" role=\"button\"><div class=\"uagb-button__link\">Multimedia Filters &#8211; Commercial <\/div><\/a><\/div><\/div>\n<\/div><\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>The MULTIBLOCK\u00ae gravity filter underdrain system utilizes compensating lateral technology through a design of continuous, interlocking laterals formed from structural high-density polyethylene (HDPE). This configuration provides even hydraulic distribution for consistent performance in both service and backwash operations in water treatment filters. For any water treatment facility relying on gravity filters, the underdrains are the [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":3708,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_uag_custom_page_level_css":"","_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"_swt_meta_header_display":false,"_swt_meta_footer_display":false,"_swt_meta_site_title_display":false,"_swt_meta_sticky_header":false,"_swt_meta_transparent_header":false,"footnotes":""},"class_list":["post-3703","page","type-page","status-publish","has-post-thumbnail","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Multibloc\u00ae Gravity Filter Underdrain<\/title>\n<meta name=\"description\" content=\"Multibloc\u00ae Gravity Filter Underdrain. 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