"Doreen Taylor" wrote in message
Can anyone help me source large plastic tanks for collecting water please?

Many dairy farmers who make silage spray a mixture of chemicals (formalin
and sulphuric acid) on the grass as it is collected. (And cows love it when
it has matured!) These chemicals come in those large blue barrels and the
main problem is getting the water out of them. Cutting the tops off
seriously weakens them. the best way of using them is to put siphons between
them plus a siphon into a normal water butt fitted with a tap.

Should you find a source of these barrels, make sure you put plenty of
washing soda in them to neutralise the sulphuric acid they contained and
formalin is not very nice either but is very soluble so use plenty of water.