Looking for opinons here. I have a customer that wants to install a water cooler that hasn't had water running through it for a couple years. It looks to be in good shape but I'm curious about the inside of the storage tank. It's had water sitting in it for this period of time and I'm thinking the water has become stagnant inside the tank and shoudn't be re-installed. Since we're protecting the health of the nation the last thing I would want is someone getting sick drinking from the cooler. Sure, I could flush with chlorine but by the time that labor is spent they coul almost foot the bill for a new cooler. Anyone else have experience with this?