CT Softwash LLC - Power Washing & Roof CleaningAddress: 919 Colonel Ledyard Hwy, Ledyard, CT 06339Phone: (860) 993-9770PSI and GPM: Usually do not miss out on the meaning of PSI (lbs for every sq. inch) and GPM (gallon per moment) values included to the stress washer And just how they have an affect on the cleaning approach. An incredibly higher PS