Severn Trent Services Supplies TETRA® LP Block(TM) Filter Underdrain System to Kansas City, Mo., Water Treatment Plant

FORT WASHINGTON, Pa. - Severn Trent Services was awarded a contract to supply its TETRA® LP Block(TM) filter underdrain system for the City of Kansas City, Mo., Water Services Department's primary water treatment plant - a 240-mgd plant located along the Missouri River. The equipment was specified by the project's engineer, Black & Veatch. The contract called for the installation of 24 14' X 50' filter cells covering a surface area of 16,800 square feet. In addition, Severn Trent provided new stainless steel backwash air headers for the filter to simultaneously backwash with air and water. The 10"-diameter air headers were uniquely designed to fit under the floor of the filters with J-Risers to bring air through holes in the concrete floors to the underdrain.

Joe Bonazza, filtration director for Severn Trent Services, said, "The TETRA LP Block is an excellent product within the water industry due to its low profile, low headloss, lightweight construction and easy installation. The TETRA LP Block is easy to assemble, has exceptional installation strength and a maintenance-free life."

The TETRA LP Block is a dual parallel lateral underdrain system constructed from HDPE molded plastic blocks that provide effective distribution of both air and water for either concurrent or sequential backwashing. The system's lightweight construction and easy assembly and installation make it ideal for both new and retrofit filter underdrain applications. Its nozzle-less design ensures there are no blockages that could potentially affect filter performance.

TETRA underdrain filters feature the patented Grout Grip(TM) design, which increases resistance to uplift from the filter floor and offers twice the pullout strength of a conventional underdrain filter block. The wide, low-profile design requires fewer blocks to be installed to cover a filter floor, so fewer joints and less grout are needed.

About Severn Trent Services

Severn Trent Services ( with global headquarters in Fort Washington, Pa., USA, is a leading supplier of water and wastewater solutions. The company's broad range of products and services is concentrated around disinfection, instrumentation and filtration technologies and contract operating services. Our analytical services group is the United Kingdom's leading environmental testing organization. Our operating services business provides contract management, operations support and systems improvements for utility, industrial and commercial water and wastewater customers in the United States, United Kingdom, Ireland and Italy. Severn Trent Services is a member of the Severn Trent Plc (London: SVT.L) group of companies. Severn Trent is a FTSE 100 company.

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