Available in configurations of 9, 11, and 13 pipes, Septic Stack units allow for exceptional soil contact without the use of gravel. The Septic Stack units function as a trickle filter, dispersing effluent into the voids in and around the specially-banded ADS pipe. This pipe is engineered with holes and slots, allowing it to collect and disperse the effluent as it passes over the corrugations in the pipe. ADS Septic Stack Systems are available for use in both residential and commercial applications. Contact your local Health Department or County Sanitarian for information on which sizes meet your state & local requirements.