Thanks Rainman, not sure of how much cfm I will have from the new pump. I didnt order it my hunting partner did and I have yet to lay my eye's on it. The goal for us is to keep a roost open for late conservation season for greater snow geese. That extra half hour of shooting and no plug,and ecaller with open freash water can be a deadly combination. I will post some pics of the new install when I get home. Based on your post I gather no matter what the goal small fine bubbles from the vertex would work better than large coarse bubbles for water lift?

shoot'em in the lipps