I have a Kinetico model 18117? (circa 1989) and I have noticed a sound coming from seems like the line from the brine tank. It seems there is some type of internal pressure leakage as I can hear water entering my aeration tank approx every 5 minutes which also seems to coincide with my submersible pump coming on/ off. The softener is working as salt is still being consumed, but I started to disassemble the head yesterday as the water disc looked dirty, and I found of lot of sediment inside the head which I cleaned the best I could (see attached pic). I do have a sediment filter located downstream of my aeration tank, and before my softener, which also seems to get very dirty faster than what I am accustomed to from past experience. I have lived in the house since 1999, and have not really touched the system that much before expect to clean out the brine tank. Is it possible the "valves" in the head are now leaking due to the sediment deposits and allowing pressure to "escape" which in turn is causing my pump to come on? I have tightened up the fittings on the brine tank line, but the sound etc persists.