Have been using for more than 12 years. Septic truck driver's are friendly & really know their business, speaks up when they see problems, always have answers for our questions, or at least tells us who to ask if they don't know. A relief to know he's not there to BS us (no pun intended ;^). And always has a laugh. If I was around that smell all day, everyday, I don't think I would be able crack jokes all day. These people are the BEST.