I have a 2 gallon galvanized waterer similar to this one . I am having trouble with it staying filled. I go check on my girls a couple times a day, and I notice that the water in the dish area of the waterer is low. I have to go twist it around, break the vacuum, pick up the top and replace it to get the dish to refill with water. Is there any trick to getting this thing to refill on its own? I went out there today and made sure that the cinder block that it is resting on is level. It was a little off, so I leveled it, but still seem to be having the same problem. Thanks!