Designed to treat up to 500 gallons per day of domestic strength wastewater.

The one-tank CEN5 is the most compact of the company’s enhanced nitrogen removal systems, specifically designed for use in nutrient sensitive areas. With the smallest footprint of any comparable system, the unit is certified to NSF/ANSI 40/245 standards and has demonstrated best-in-class nitrogen removal performance in multiple-state field testing protocols.


The CEN5 is a stable, compact, one-tank workhorse. With a footprint of only 8′ x 4’2″, this system is rated to treat domestic strength wastewater flows of 500-gallons per day to NSF 40/245 standards making it a go-to choice for septic professionals designing systems in environmentally sensitive locations where maximum nitrogen reduction is required or desired.

Weighing in at a highly maneuverable 463 pounds, this fibre-reinforced plastic (FRP) unit can be squeezed into tight and difficult sites. Designed to accommodate variable flows and shock loadings as well as being highly energy efficient (1.2 kWh/day), this low maintenance system, like the other CEN residential models, is ideally suited for both replacement sites and new construction.