I need to replace my pool pump. The motor arched and sparked the last time I tried to start it. I have been researching variable speed pumps versus single speed pumps. I have a 300 lb. sand filter and 1.5 inch piping. The previous owner put a 1.5 HP Supastream pump which I can't find information for on any U.S. website. I believe the pump was pumping at a flow rate exceeding the filter capacity. So now to my question. I only need the pool pump for my pool(no other features). Why don't they just make a single speed pump that will run at a lower RPM and allow for the same savings as using the lower setting on a variable speed pump? What am I missing?
If I need a pump that will pump 45 gpm (20000 gal pool) to turn the pool over in 8hrs. can I just buy a 3/4 or 1/2 HP pump that supplies that flow rate?
All the blogs say a variable speed pump will save money because you can run at a lower rpm for longer and get the same turnover. So if all I am going to do is run the variable speed pump at a lower RPM for longer than why not just have a single speed pump that runs at a lower RPM??? What do I need the multiple speeds for?? I don't get it. Please help me understand.
I do know that for a sand filter backwash I would need a higher flow rate but I am thinking about replacing it with a cartridge filter which would support my questions
Thanks in advance
20k pool with swg. augusta, Ga..