How long should it take to fill a 85 gallon bladder tank? The pump is a 3/4 hp 3 wire flotec submersible. The tank is flotec and I'm on a 40/60 switch. I just replaced the switch, pressure tank, control box, and pump. Pump does have a check valve built in. I flipped on the power and it seems to be working fine. The only thing I am concerned about is the 85 gallon tank is empty. I'm at 36 psi on bladder and I have it turning back on at around 38psi. Also from the pump down at bottom of the well, what size pipe should I be using? 3/4 inch or 1inch?