Old Rotary Rail Dump System Service

On 2003 we installed ADS Dry Fog into a Rotary rail dump located Gerald Gentleman Station Power Station in Nebraska to help them reduce the amount of dust generated at each wagon dump. Few weeks ago our client told us that the system wasn't working as expected and probably will need an upgrade to make it run as it used to do it. Last week our Field Service Manager went on site to inspect the system but he ended up servicing the system. When he left this 16 year old dry fog system, it was running just as well now as the first day on install in 2003.  He mentioned that the system was running very good and it was way too foggy to see your hand in your face.