I hope somebody will be able to help me with some issues related to the BIAB method. I've been preparing beer several times in this way and the taste was very good. However, what constantly troubles me is efficiency. I'm always about 55% and I do not know where I'm wrong. I have done sparging and full volume method and the result is the same. Maybe it's a problem in maintaining the temperature, because I'm working manually. I used grist to water ratio 1: 3. What do you think may be the main problem in BIAB method?