That was the first way we tried and honestly there just wasn't enough 'push' to move things along. Thats what led to using the expandable bladder. It will hold water, thereby increasing pressure, until the bladder expands to fill the inside diameter of the pipe. Once reached, the water is forced out the bladder. It's a dedicated vacuum line that was added sometime after the original construction.

Thanks again for your input and for taking time to help us figure it out

doc