Calling on any water softener experts. I have a Ecowater 3500R30 that is about 12 years old. Recently, after water usage, I can hear a small amount of trickling in what sounds like the resin tank. It sounds like it’s dripping from the control head down back into the tank. It last for a few minutes, then it stops. It doesn’t always do it, but it’s started again last night. Any ideas?