Your Blast Zone Inflatable operates by pumping air constantly in, and through the inflatable. The air then escapes through the seams, or back out through the blower during jumping. It is perfectly normal to hear hissing, whistling, "air leaking," and to see bubble at seams in water parks. This is all part of the normal operation. Some areas of the inflatable may be louder than others. This process is also referenced in the manual, on the label and sometimes printed on the product.