Grams, I did not feel any restriction on till my first fill [2cc] Second Fill {an other 2cc ] got me close to the Ideal amount of restriction.8 Weeks later [Yesterday] I ask for one more cc and found out Today it was a little bit to much. I was able to drink the Water after the Fill, but today it completely choked me off. Had to go in to take some out again[ 1.5 cc ]. so next time I try with maybe only .75 cc to get me at 4.25cc total . then will see , maybe it is better with smaller Steps ,specially approaching the Ideal SPOT.