My neighbors pump is making a crunching noise, and we have no idea why. it is about 2 years old, a Hayward 1 HP Powerflo( i think thats what it's called). Anyway, it is making a strange noise and has almost no suction. There is a little bit, but not much. Her filter pressure is normal 18 psi, and we tried backwashing to see if something was stuck. Took out pump basket and felt around and are clueless.......help?