I once read a few people say that they never waste insulin. I can't figure out how to do that when I change cartridges. There is always 10 or so units left.
If I try to let her insulin get lower than that it seems she gets high glucose. Do the people that not waste insulin keep using the same cartridge and add more insulin to th sold insulin? That doesn't seem like a safe idea to me. DO they just run down to zero units?