I have a 100 ft well, waterace 1hp pump, packer ejector, 2" PVC schudule 40 casing, 86 gal. bladder tank. Been working fine for 8 years. When the valve is closed between the pump and tank with the pump off, I can hear water flowing back into the well and see the pressure drop on the gauge. It only takes about 3 min. to drop from 55lbs to 20 lbs. and then the pump cycles agin. Should I replace the packer ejector or might it be something else?I also started getting lot of sand in water about a year ago but not as bad now as it was. Could the sand have damaged the packer ejector?