Drainfield recovery using microbubble aeration

This system had effluent surfacing within 8 years of being constructed.  A heavy biomat build up in the drainfield caused the failure.  The drainfield rockbed was completely full of liquid.


  • The University of Minnesota was consulted to confirm soil conditions and reason for failure.
  • A Microbubble aerator was installed in the septic tank.
  • Surfacing was eliminated within a month.
  • The liquid level in the rockbed was normal at 60 days.