Gina we have the complete system and it does work great.
Check the internet for good deals.
I think we will use the wag bags in our Scamp
tiolet when cold so we do not have to deal with the black water tank.
Coming from a white water back ground this is easiest and best that I have ever seen. This is the only unit that can be dumped in any trash container( great when boondocking).
The price may scare some but once you have it you will love it.
The shelter works great for a shower also.