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DISTRIBUTING wastewater on soil is essential for most on-site domestic wastewater renovation systems. Pressurized distribution systems are necessary for the application of wastewater to all portions of filter fields located on sloping sites. Current design criteria for pressurized distribution sytems that will function properly on sloping sites are site specific. Components of the systems vary from site to site, and hence cannot be premanufactured. The newly developed parallel distribution controller is not site specific in its design. It performs well on any sloping site where distribution laterals are at different elevations, and can be premanufactured in mass and made available to consumers in all areas.