In the case of air treatment systems I have come across the problem that lack of water pump page axis at the end of the shaft axis is often. I expected to be caused by a substance acid etch patterns in the tank.
In the case of air treatment system I found that the problem Shaft of the pump shaft ends often. I expected to be caused by the etching solution in the tank.
In the case of air treatment, I found the problem that the axle of the pump of the ends of the axle frequently. I expect to be caused by the etching solution in the tank .