Return on Investment Calculator Manual Flushings per month per site (fire hydrant) A value is required. Duration (minutes per flushing) A value is required. Figures and costs by flushing manually Water outflow per month (gallons) 1500 gpm at 75 psi Total Cost of Flushed Water (monthly) per site $ 0.006 per gallon Total Cost of Flushed Water (annual) per site $ Estimated Cost of Labor/Transportation (annual) per site. $ $ 50.00/ hour at 1.5 hrs / site COST OF FLUSHING PER SITE (annually) $ Figures and costs by flushing with Hydro-Guard Flushing with Hydro-Guard per month per site Duration (minutes per flushing) Water outlfow per month (gallons) 150 gpm at 75 psi Total Cost for Flushing (monthly) $ 0.006 per gallon COST OF FLUSHING PER SITE (annually) $ Water Savings (gallons) TOTAL ANNUAL SAVINGS PER SITE $ Cost of Hydro-Guard Flushing System (price will vary) $ ESTIMATED COST SAVINGS $ NET GAIN FIRST YEAR (per site total savings less cost of unit).