I recently removed a manhole cover to inspect my waste at the property I have just purchased. My Kitchen waste runs down into the manhole, but does not drain away completely. I looked for and removed the next manhole which receives waste from my toilet / bathroom via the soil pipe. this is clear. On closer inspection the second manhole is deeper, is it normal for kitchen waste in this instance to remain in the pipe until the level is raised to allow it to drain away but not completely???? or do I have a problem? I have used rods and cleared what I can. (lots of kitchen fat) but the level is still there. Help and advice much appreciated.