Chuck, glad all arrived AOK.You are fine in 7 ft of water with the Vertex Co Active Shallow water model, in fact your fine even at 8 ft and youll see our site state that as our web people are making that and a few other changes.Where you are not fine is that if you are pushing the 0523 to that one station it is too much air for both the diffuser and too much back pressure on the pump if 9 psi is accurate.It should read zero if you do not have a check valve on the pump when it is shut off.If a checkvalve is on the intake (air filter side) it will register some pressure in the line at shut off. ( I dont like 9 psi on a 10 psi pump as its working too hard for pump longevity)) Take the gauge I sent you and put it on the vane to test for a true reading and let me know. Take Cary's caution on startup as the gospel this time of year.
