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| Tetra Snap underdrain filter block Severn Trent Services has introduced the Tetra Snap T Underdrain Filter Block, which features a new 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. write your comments about the article :: © 2007 Construction News :: home page |