mascerator installation

Hi

I have just had a loft conversion done by a specialist company (my DIY skill really weren't up to that kind of heavy steel!).

They put in a bathroom up there - loo, sink and shower. They insisted a mascerator was necessary for the loo (the outflow had to cross under the bedroom with a very limited drop, and then down the back of the house, so I guess it needed all the help it could get).

Now - my question to you experts is this: would you expect the mascerator to "go off" (with it's unique hideous grinding noise) not only when the loo is flushed, but also when the sink is used, and the shower? If one attempts to have a shower, you have to tolerate the noise of the mascerator (sounding like someone riding a small motorcycle stuck in first gear) going off pointlessly every 10 seconds.

We are having worse problems in that the mascerator is making even stranger noises than usual, the loo sometimes fills up, and we are getting smelly water flowing up into the shower tray. Nice.

All this makes me wonder is the whole bathroom installation is misconceived - whether the way that the loo, the sink and the shower all share an outflow, the triggering of the mascerator by the sink and the shower, and the way that some kind of mascerator failure is causing water to back up into the shower - is all this linked?

I want to get a basic answer, so that when I go back to the builders to beat them up about this, I am armed with the basic plumbing common sense on this. All (good) advice most welcome!

cheers

P.

Never mind the poo mincer and it's inevitable problems waht about a biolet?(expensive) Only trouble is they seem to be dehydrators ather than composters, but I could be wrong. There are others as well, and some . low cost models.[/url]

biolet what about a basinolet and a showerolet . In my humble opinion, the whole project should have been designed round the sani. accomodation......but then I`m not a Smoke-dwelling poncy extension designer I`m just a simple Country plumber

See my comment at //www.diynot.com/forums/viewtopic.php?t=51583&highlight=saniflo.
I'd only add that the gods should also have a rule applying to lofts.
And you'll probably still need the long rubber gloves.

If the horrid thing is back-flowing, it's probably fitted wrong or defective. All the appliances (WC, basin, shower, ..) should be connected to it. They must not share a waste pipe in any other way.