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Issue with tower water level
The attached pictures are of a level control (BAC part EWLC-4) The tower is Baltimore air coil VTL130 installed in 1992. The level control, and solenoid were replaced about 5 years ago, this issue just starting occurring in the past few weeks. The issue is that this foam like substance gets between the probes, causing the level control to not send the signal to the fill solenoid. The tower runs low, the pump eventually stops pumping, and then the units go off on high head pressure. I remove the level control from the stand pipe wipe the probes dry, and then the controller calls for the fill solenoid to come on. The operation is normal for about two weeks, and then the process repeats. I have drained the tower completely thinking that this was something that was added by the water treatment company, but the issue occurred again. With both the pump, and fan on their does not appear to be excessive vibration that would cause some type of water surging. Any suggestions would be much appreciated. Thanks to all.