I have a shallow well, and my above-ground pump has been turning on/off every 10-15 minutes. I can't find a leak anywhere. My pressure tank was down to 0, so I emptied it and pumped it back up to 30. Turned everything back on, and it seemed to work fine for about an hour. Then pressure dropped way back down, and the pump started cycling ever 10 minutes again. Even worse, I now have very low pressure in the house... even with the pump running. Again, I can't find any leakage in/under the house pipes. Any advice is welcomed at this point...