Fill it not quite full, trim up and down a few times. It's a good idea to put a rag under the trim pump area before trimming. It's because if it was real low, it will foam up and look over-filled, some may come out. You will have to let it sit overnight at that point and check again in the morning. If the air is settled out it may look low, top off and repeat trim till its full and air free.
