I just found this site, prob because I have never had any pool issues til now. 
But, i have 24 foot round doughboy that is 2 years old. We clean meticulously, and never go a day without checking water conditions. We clean the skimmer with a minnow dipper daily, even reach over and grap the skimmer basket as it tries to float up when we shut the pump off..so that that debris doesnt get under the basket and make its way to pump. We look at the pump basket daily...we backwash weekly and put a few minutes of fresh water in, usually after every other backwash. SO...just to let you know that we take good care of the water and the pump is only 2 summers old...
but...the pump is loud..not a screaching loud as if it needs bearings, just loud as in its working too hard and the not much water was moving. To verify, I backwashed and the flow is very low. Usually I havd to hold the backwash hose on tight because when I move it to BW it jumps around like a huge cobra...
..now the pressure is so low I dont have to hold it all. Probably 1/5 of normal flow. I do not have pressure guage..i lost it after I opned the box when I put the pull in and havent put one in yet..so I have no pressure readings. No leaks in hoses, skimmer and pump basket are clean. Took out plug on bottom of pump, drained clean water. Should I change the sand? I would gladly do whatever anyone suggests so that I may learn. Thanks!
But, i have 24 foot round doughboy that is 2 years old. We clean meticulously, and never go a day without checking water conditions. We clean the skimmer with a minnow dipper daily, even reach over and grap the skimmer basket as it tries to float up when we shut the pump off..so that that debris doesnt get under the basket and make its way to pump. We look at the pump basket daily...we backwash weekly and put a few minutes of fresh water in, usually after every other backwash. SO...just to let you know that we take good care of the water and the pump is only 2 summers old...
but...the pump is loud..not a screaching loud as if it needs bearings, just loud as in its working too hard and the not much water was moving. To verify, I backwashed and the flow is very low. Usually I havd to hold the backwash hose on tight because when I move it to BW it jumps around like a huge cobra...