On 28 May 2009 09:26:33 GMT someone who may be YAPH
wrote this:-

You might be using the bidet when Fireman Sam comes along and attaches his
water pump to the hydrant down the road, dropping the pressure to your
house and sucking the water and unmentionables back out of your pipework
into the common main. Then Sam turns his pump off and Mrs Jones down the
road finds she can fill a glass of water again ...

The chances of this happening when the bidet is fed from the mains
and a double check valve is fitted to the hot and cold supply are, I
suspect, so small as to not be worth considering. Mrs Jones' house
is probably more likely to be destroyed by an aeroplane falling out
of the sky.

Is the water supply often contaminated in this way in comparable
places with a more relaxed attitude to such things?



--
David Hansen, Edinburgh
I will *always* explain revoked encryption keys, unless RIP prevents me
http://www.opsi.gov.uk/acts/acts2000/00023--e.htm#54