Digby wrote:

That's a good thought but my macine will be about 20 feet from the
nearest point I can connect to the sewer - doesn't this imply that I
will constantly have grey water lying in this pipe work ?
How should I protect against flowback into the outhouse?

You really need to raise the level as close to the washing machine as
possible. Is it out of the question to run a 32mm or 40mm waste pipe
from next to the washing machine to the point at which it drops into the
main waste?

If not, raise the waste pipe close to the washing machine and then run
from there to the waste at an elevated height.

Do not be tempted to run the waste at floor level all the way across. It
wouldn't be a great idea - if winter caused the pipe to freeze then you
are asking for trouble.

* and thanks for your helpful replies ; )

That's what we are here for.

Well, some of us are anyway. There's at least one person who appears
like a jack in the box to provide entertainment value. Hysterically he
tends to get involved in providing advice on comb boilers and similar so
this thread may have escaped his attention.....

Andrew

--
Please note that the email address used for posting
usenet messages is configured such that my antispam
filter will automatically update itself so that the
senders email address is flagged as spam. If you do
need to contact me please visit my web site and
submit an enquiry - http://www.kazmax.co.uk