Presby Environmental (PEI) was recently acquired by Infiltrator Water Technologies (IWT), uniting PEI’s market-leading combined treatment and dispersal technology with IWT’s broad offering of onsite wastewater treatment system technologies. PEI’s pipe-based combined treatment and dispersal products have a nearly 30-year history of demonstrated wastewater treatment performance, with third-party testing organizations including NSF, MASSTC, and BNQ documenting the excellent passive wastewater treatment performance of the AES and other combined treatment and dispersal systems.  IWT has been manufacturing drainfield, septic tank, and tank-based wastewater treatment products for over 30 years.