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?

Thanks guys