Air grid for underdrains and similar systems

摘要: Air grid systems for distributing a gas within treatment such as underdrain filters and contact clarifiers is disclosed. The air supported from above so that it can be lowered into position thus modified or repaired. Additionally, this feature permits retrofitting an existing system, filter, in which the bed of media overlying not upset by installation. Thus, methods installing are also In another aspect present invention, comprised manifold connected to laterals spreader conduit inserted through smooth bore walls manifold, thereby providing simple easy manufacture structure avoids problems found prior art components.