I was going to do a 2stage acid/base process and bought a 15L drum of H2s04 - i attempted to make one batch so have used about 200ml of the drum - i did not have a great success with it and have now moved on to two stage no titration production.

Anyone interested in this - it is only about 4 months old - still in the black container - make an offer - would have to be collected from the North Shore in Sydney