Actually the bubble size in oil does not matter unlike water. complete different animals. also the part where you and lots of others state low flow = more O3 - Ozone concentration; that is correct with low flow devices. mine are high flow 10 g/hr it is taking me 12 hours to ozone 800 ml. of olive oil. i have a .50oz container sitting out of fridge in 72-80 degree room for 2 weeks as soon as i take cap off you can smell the ozone emitting from the salve from 1-2' away. had i went much longer ozonating the oil i would have started to make plastic. the olive oil i'm currently using is called ZOE i think amazon may actually own it.