I have a shallow point in the ground at 17 feet for 25 plus years. We don't believe it is low on water as the water table has not gone down . When the pump has stopped running and you turn on the water it runs about right until the pump kicks in and then you will get blasts of air. The air blast will continue off and on while the pump is running. I will be using some of the Nu Well tablets to clean the point, but while reading this forum it sounds like it could be an air leak. If it is an air leak, how do I test for that? The check valve keeps the pump primed for weeks. The tanks bladder also keeps a charge.