I haven't used HC-110 for LF but I use it a lot for 120. My tank needs 600ml of solution, so I measure out 18.75ml of syrup into a graduated measuring cylinder (well, I go to just under half way between 18 and 20 ml marks. It's not exact but it's close enough for me. I guess I could get a more accurate graduated cylinder if I really wanted to). I then top the small cylinder up with water, stir it a bit, then pour into the main graduated cylinder. I keep doing this until there isn't any more syrup stuck to the inside of the small cylinder, then I just top the big one up until it's exactly 600ml. When I first used HC-110 I thought getting the syrup to dissolve was a complete PITA, but now I'm used to it it's not so bad really.