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An interesting update…but one that will require a day or two to confirm. We’ve only lived here one week. The house has an irrigation system that had the water valve closed (from last winter). Last Wednesday I opened the valve so I could water the lawn. It seemed to me that we had not heard the foghorn prior to that. So, this afternoon I closed that valve. So far, no foghorn. Will give it a couple days to confirm.
Since I am not a “lawn overachiever”…I may use the system during drought periods but not routinely. Not a big deal to pop the cover and open the valve when needed. Time will tell. Of course, no idea why that would cause the hum.
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Mike
“I wouldn’t want to live under the conditions a person could get used to”. -My paternal grandmother having immigrated to America shortly before WWll.
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