Rather than hijack Tony's macerater thread dealing with black waste I started this one for grey waste.. Getting rid of grey waste can be a real chore, we tend to use more water than European vans, automatic washing machine, dish washer, tub, shower all produce huge amounts of waste .. Driving every couple of days to a dump point is not only a chore but does the engine no good whatsoever, pulling a waste carrier is the other option, but this is a heavy task if not done at least twice a day.. On a fully serviced pitch you don't have this problem but they are a) expensive b) few and far between, if like me you like to either use an aire, cl or wild camp then there is a better alternative.. Use a length of 1" hose, say 10mt and run the grey to the nearest hedge .. or ditch and leave the gate valve open.. , this is 'greener' than filling up a site waste tank and is actively encouraged on many CLs who don't want to have to pay for getting rid of it .. I use the macertor discharge hose.. another good reason for having a round rather than flat hose. On one aire I was on, a guy had bought several lengths of domestic Marley waste pipe, some couplings and had piped his into the next field.. It won't always be allowed, ask the site owner first, but it's another option which I have used many times.. This pic shows the grey waste connection..