My 12 year old engineered Low-pressure-dose septic system was failing due to grey sludge in the leach field pipes. Flushed them out best I could and installed the Aero-stream Remediator. After several months, those aerobic bacteria seem to have eaten away at the grey sludge and revived the leach field, saving me thousands. Back pressure from the field was burning out the LPD pump prematurely. Now pump works effortlessly and leach field is clear. Thanks to Dave and Bob helping me through details, making it very easy to install. Love America!