CT Softwash LLC - Power Washing & Roof CleaningAddress: 919 Colonel Ledyard Hwy, Ledyard, CT 06339Phone: (860) 993-9770PSI and GPM: Don't pass up the indicating of PSI (lbs for every square inch) and GPM (gallon for every moment) values added into the force washer And just how they have an effect on the cleaning approach. A particularly high PSI an