Layne Christensen Co. and WSI Intl. are working together to provide high-efficiency, scalable, custom-engineered wastewater treatment plants. Standard plant sizes range from as large as 1 mgd to as small as 6,000 gpd. During aeration, these plants use a proprietary media to increase surface area and promote biological growth. This enables the reactor to carry up to four times the biological load. These turnkey plants are designed to produce R1 water under Title 22.