We resently had to replace our water pump at our cottage due to it cracking over the winter from not winterizing it correctly. Our brother in law forgot to pull the plug. So with that said we had to replace it with an sjo7 gould3/4 horse water pump. We had had nothing but problems with it. We thought that it was faulty so we took it back to where we bought it and had them look it over. Everything checked out fine so we reinstalled it. They suggested that we treat the well with acid since a new pump might be suctioning up sludge into the screen, so we did that as well. It seemed to work more efficiently but something is just not right. We loose water pressure and it takes a while for the pump to build up water pressure again. It seems to be cycling often and can't keep up with the demand. If we use our garden hose we loose the pressure in the house where nothing is coming out of the faucets. But if we wait for 5-10 min. it will work again. We can't run the washer and take a shower because of a drop in water pressure. What have we done wrong?