I have a sta-rite dyna-glas 1 hp pump that's been churning/chugging/cycling/pulsating/whatever you wanna call the waves of low & high pressure when it's hooked up to the pool vac. It doesn't have nearly the pressure it should anymore. There are also various leaks and crusty lime around it in various spots.
I took it apart today to see about replacing various gaskets and the shaft seal. There was various debris in the impeller but i couldn't get the impeller off for the life of me (yes, I clamped down on the shaft in the rear of the motor). So I cleaned it out best I could and lubed various rings (didn't replace them though), and put it back together. Same thing.
I also have a cristal flo sand filter, though I don't know the size off hand (says 53115 on the handle). My pool is about 16,500 gallons.
Now I also have a hand-me-down pump and sand filter that hasn't been in use in at least 4 years, sitting out in the Phoenix heat. That's a 1.5 hp pentair pump which I believe is a whisperflo (label said 2.2 SFHP and 1.47 SF) and the filter is Pentair TR-100.
What would you all suggest, seems there are two different scenarios:
1. Repair sta-rite pump.
But how do I get the impeller off? And how do I know what a worn part looks like in need of replacement? If I take it to a pool store their parts cost an arm & a leg, but I can order them online much cheaper. But which parts should I be sure to order and replace? Meanwhile, my pool is green and I'd be without a pump.
2. Replace sta-rite with used whisperflo pump.
Can I swap this pump to use with my current sand filter? I'd really rather not wrestle with replacing the sand filter at this time. Am I gonna run into issues with a pump that's been sitting dry for so long? Is there a way to test it before hacking away at the PVC?