Had a similar problem. What caused the problem was long term expansion and contraction of the tank when the IBA would draw water via a 1" pipe (caused the water pressure to from form 80psi to 45psi and so the tank would expand and contract). A pressure regulator fixed the cause. The tanks needed to be replaced after many different types of fixes were attemped. I purchased the tanks, sand and the resin online, had it shipped, poured in the sand & resin and screwed in the tanks. Saved about 50% from having Culligan come in and do it. very simple to do if you do need to change them.