"David in Normandy" wrote in message
...
I want to reduce our metered mains water usage. So I'm
considering using rain water collected from the roof via a
huge water butt outside for flushing the downstairs toilet.
I've heard of others that have done this. I just wondered
what issues I need to think about?

I don't know what French regs are but the Green Building Store sells
specially designed rainwater/mains water WCs which are very efficient and
switch automatically between the two water sources.

They are expensive though ...

http://www.greenbuildingstore.co.uk/

Mary