My water softner (sears 10 years old) Is dieing being replaced next sat with a fleck. It does not rechage very good and the brine well fills with water after a while not to the top just untill the fill float floats. Water is really hard now can not wait untill next sat. Anyway I have also noticed on occasion a little air in the line, like when you shut the water off and back on. Is this most likely the busted softner or just some stray air from the main?