Dear David:

"I would like to take this opportunity to thank you for introducing me to your Water Conservation Program.  While only a few months into the program, the savings have exceeded my initial expectation.  The workmanship displayed by your staff during the performance of the conversion was outstanding.  The customer service received from your company has been outstanding and your management staff is very professional.  In closing, I would like to thank you for your assistance in the reduction of our water consumption and for the money you have saved our company."