Filter Block provides positioning stability during backwash.
January 23, 2007 -
Equipped with snap-locking mechanism to interconnect underdrain blocks, Model TETRA® Snap T(TM) Block restricts movement of blocks by offsetting upward forces of backwash. System features ¼ in. opening between each block to allow backwash water into and filtered water out of the filter. Covered with polyethylene plastic for easy installation, units offer resistance to corrosion and can support up to 8 m of media.
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|Original Press release |
Severn Trent Services
580 Virginia Ave., Ste. 300
Fort Washington, PA, 19034-2707
Severn Trent Services Introduces the TETRA® SNAP T(TM) Underdrain Filter Block
Revolutionary design promotes block stability during backwash procedures; new block features.
10-year repair and free replacement warranty.
FORT WASHINGTON, Pa. - December 12, 2006 - Severn Trent Services has introduced the TETRA® Snap T(TM) Underdrain Filter Block (U.S. Patent Number 7,141,164), which features a revolutionary design incorporating interlocking blocks that promote stability of the block position during backwash procedures.
Water, wastewater and industrial filtration facilities typically have an underdrain system to support filter media and to separate the filter media from the bottom of the filter. In addition to providing support for the filter media, the underdrain system serves two primary purposes: to allow filtered water to pass through to the collection system and to start the distribution of backwash water and backwash air across the filter.
The TETRA Snap T Block is equipped with a snap-locking mechanism, which interconnects a row of underdrain blocks, substantially limiting the movement of the underdrain blocks during backwash procedures by providing the weight of the entire row to counteract the upward forces of the backwash. A ¼" opening between each block is maintained to allow backwash water into and filtered water out of the filter. Jacketed with high density polyethylene plastic for ease of installation, the blocks are corrosion resistant and are capable of supporting up to eight meters of media.
The Snap T Block features a 10-year repair and free replacement warranty.
About Severn Trent Services
Severn Trent Services (www.severntrentservices.com), based in Fort Washington, Pa., is a leading supplier of water and wastewater treatment solutions. The company's broad range of products and services is concentrated around disinfection, instrumentation, and filtration technologies, contract operating services and state-of-the-art residential metering products and services. Our international management services business provides support in all aspects of water and wastewater utility operational development and business transformation. Severn Trent Services is a member of the Severn Trent Plc (London: SVT.L) group of companies. Severn Trent is a FTSE 100 company.