A couple of months ago I changed the pressure switch on my well. To relieve the pressure I opened a tap and let it run for a few minutes with the power to the pump off. When I removed the switch, water went everywhere.I did get the switch in place and rewired.Since then, the switch "jumps" (as it did before) and water pressure is little better than a medium trickle. How much air can be readded to the tank, if necessary?