no pressure

Good afternoon, I am visiting my auntie here in kalihi. She owns a apartment on the first floor. The apartments were built years ago....it's a slab foundation and cement blocks... I took a shower the first day I got here and realized she only had Luke warm water, I didn't really think anything...

Good afternoon, I am visiting my auntie here in Kalihi. She owns a apartment on the first floor. The apartments were built years ago....it's a slab foundation and cement blocks... I took a shower the first day I got here and realized she only had Luke warm water, I didn't really think anything...

Last year we had a 150' drilled well with submersible pump installed for a new house. The house is nearing completion and we are trying to get the well online. From the well there is a check valve, a 40/60 pressure switch, a 35-gal Flex-Lite pressure tank, followed by a hose bibb with pressure...

Yesterday our pressure tank lost all water pressure. I got under the house to find the psi on the tank was next to zero. The bladder seems to be fine, as I checked the air pressure and it is at 28psi (I have a 30/50 tank). If I turn off the power, close the main water valve, drain the tank, then...