Great morning to ya Smokey and friends. In Jamaica last Feb. i asked Doc about this and told him i was using one of those lil 30ml. plastic measuring cups that come with medicine etc. I said i fill that up for every 2 gals. of water , which is 15mls/gal. This is my Drench strength ,NO MATTER what Drench , or when i give them, it;s always the same 15mls. per gal. of water. EVERY TIME!