I’m currently installing the macerator for grey water - this should be ok . My understanding is I need to get the initial vertical pipework high as possible then have a fall into the main drain . Thinking ahead though I wish to install a wc below ground . It’s going to be difficult ( I can’t see a way of doing it ) using this method for non grey waste ? From the photos can I do this ? . Run the waste horizontally for many metres then come up on the other side of the black waste ve