The message
from MM contains these words:

I can't visualise the quantity. Is it a lot? It's 219 UK gallons, but
that is still a quantity I can't really get my head around. How much
would I use watering the garden? 20 minutes with a spray head on a
hose over approx 75 square meters, that is.

10 normal-sized water-butts.

--
Rusty
Open the creaking gate to make a horrid.squeak, then lower the foobar.
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