Hi all I'm making a mash tun out of two old buckets that I used to use as FV's. Done a bit of research a while ago on it and spoken to bloke at my LHBS. I have now fitted a tap to one of the buckets and about to start drilling holes in the bottom of the other, I'm wondering what size would be best 1 mm or 2mm. I have also got a bit of 15 mm copper pipe which I have blocked of one end and will screw onto tap of boiler for sparging I am wondering how big the holes should be for this and should it spray to edge of mash tun or would you just move it a little during sparge