Our well feeds a 119 gallon Amtrol (?) pressure tank under the house. If it’s real quiet you can hear the solenoid click and a slight hum as water runs into the tank, so I sometimes know when it’s filling. Once in a while, it will cycle first thing in the morning shortly after the first flush or run of the tap. I’m not sure why this is…. seems like it should require many gallons drawn out before it calls for refilling. One possibility is an underground leak. I don’t suspect this because I put the piping in myself and it was under pressure and not leaking when I buried it. Sure, it could have a leak now, but… Second possibility is that the pressure tank is forcing water thru the check valve and back into the well. I can’t think of other reasons. There are no leaks in the house piping. It’s all accessible under the house and I’ve checked it all carefully… all dry. Any ideas?
And, how many gallons should the tank provide (from full) before cycling?