I have a 2 HP Waterway Hi-Flo 2 speed 48 frame pump feeding a sand filter that is between 150 and 175 lbs (I think) on a 15,000 gallon above half ground pool (counter sunk lol). Please forgive me for not remembering the exact capacity of the filter. The pump is only a 2 or 3 years old, but so far has had 1 seal fail alone & then 1 seal fail when the first impeller failed 2-3 month ago, actually the seal may have only been leaking because the impeller was broken. I have noticed that the pump has developed a kind of growling noise coming from the wet end starting about 1.5 months ago. On Friday I saw that the seal was leaking again. I went and bought another new seal to put in it, but when I took it apart I found that the impeller was badly cracked around the shaft area & the shaft part fell right off when I tried to replace the seal. The impeller was clean & the motor seems to spin smooth & free. This is also the exact same way that the first impeller failed. If it matters, I run the pump on high speed & have it on a timer that has it running a total of 10 hours a day.
My biggest question here is:
1) What could possibly be causing repeat impeller failures after only 2 or 3 months?
2) Would I be better off replacing the entire wet end?
3) Does anyone know if there is an impeller the has a metal shaft area?
Thanks for any opinions or advice.