The Retro-Air rejuvenator system from Septic Services improves flow and returns failed drain systems to optimal performance by delivering a constant flow of air to the diffuser. The system is designed for 500- to 2,000-gallon tanks and can be installed in single or multiple compartment septic tanks. Available in four models, the system includes linear air pump, housing with platform, air line diffuser assembly, outlet baffle filter and installation manual. 800/536-5564; www.septicserv.com/store