For what it is worth, I am new to the boating industry and have a post going on while I rebuild a 34ft DC I pulled the lectra/san system off the boat last week, I know it has not run in over five years. I pulled the bolts, removed the top, no solids inside whatsoever. Flushed thuroughly and checked to see if all worked. Both motors turned the way they were supposed to and everthing else I could check seemed to be ok. I don't know about other systems,,,,but to me that tells me they are made pretty well. I will just reassemble and reinstall this week,,,,and will even hook up the other head to it as well as one system will handle two heads. You can also install a holding tank, for the occaision that some marinas forbid there use while docked. I have heard they post at the marinas if its not okay to use them.