Okay, maybe....... However in most cases the bubbles could only exist in the zone where there was low pressure, even with the pumps you use that zone is still relatively small, upon exiting that zone the water pressure would collapse the bubbles. I will admit that I am making a lot of assumptions as I have never seen your set up in detail but unless the entire system is submerged without a single joint exposed to air than there is a possibility (likelyhood) that there was air coming in from outside of the system.johnptc;840094; said:except the mag drive was totally under water.........the air must have come out of solution with the change in pressure and did not redisolve before existing the pump.....
as for the conservation of mass.........i am sure mass was conserved however water contains many gases in solution.....think what happens when you open a soda can....co2 comes out of solution with the change in pressuer ( opening)...many bubbles
In response to the original post: From my humble experience I would say if you dont mind the looks of the bubbles than leave it alone, they can only help