wrote in message
oups.com...
I'm presuming the problem is that the rain butt is vented to the
atmosphere at the
top?
Simply replacing this style of "cistern" with a sealed "tank" would
solve your
problems?

Or perhaps do as I did: sat the water butt on a high wooden platform to
make use of
the wasted upper space and to give me lots of flow pressure.

We did that too - but so that we could put a watering can under the tap to
fill it. It was a bonus that we could run a hose down the garden from it.

Another solution is to have another one - or more - butts round the gaden,
all connected. That way the level in each is equalised.

The water we get from the roof is so clean I'd be prepared to drink it raw.
If there are any solid deposits they must fall to the bottom of the butt
because we never see any - nor do we from the water we collect in another
butt from the greenhouse roof.

Mary