Source text - English The TETRA media retention plate is designed and installed to ensure long-term stability and durability. It was designed as a replacement for the gravel supporting filter media beds equipped with the TETRA “U” Block and “LP” Block underdrains.
The media retention plate is manufactured of ultraviolet resistant HDPE which is fitted to the top of the underdrain block. The plate is fastened to the block with three rows of stainless steel self-tapping screws (18 minimum per block) and the edges are sealed in place by NSF certified, gasket forming, polyurethane sealant. The exposed edges of the plate will also be covered with the sealant to prevent side leakage. The media retention plate will provide uniform distribution at headloss equivalent to, or less than gravel headloss.
Translation - Chinese TETRA滤料固位板能提高长期稳定性和耐用性。它用于替代TETRE U和LP布水系统中支撑滤池滤料的砂砾。
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