I just purchased a pump/sand filter combo unit on Amazon, because of the unusually low price:
Amazon.com : Hayward Pro Series S210T93S 21-Inch Top-Mount Above Ground Pool Sand Filter System with 1.5-HP Matrix Pump : Swimming Pool Sand Filters : Patio, Lawn Garden
[I'll note for future reference that the price for this unit, today, is down to $147; it was a few dollars higher when I bought it]
This appears to be a good price for the 21" sand filter, which is what I was mainly after with the purchase; however, the packaged 1.5 hp single speed pump seems oversized for what we'd like in the long run. We'll probably run the unit as is, for a few days, when it arrives next week (just to check if everything works OK out of the box), and then swap in a 2-speed pump in the spring.
One option would be a motor replacement. If anyone would be willing to double check that this motor (below) is appropriate, that would be a big help!
Looking here for replacement parts for Hayward Powerflo Matrix pumps:
Hayward Power-Flo Matrix Replacement Parts
And then option 15d from the above page, a 1 hp 2-speed motor:
Motor 1 to 1/8 HP 2 Speed Threaded 3450/1725 RPM 115 Volts 60Hz 11.0/2.9 Amps SF 1.0 48Y Frame
Does that look right? Is that an off-brand motor at that price?
Is there a recommended website where people buy replacement pump motors?
My other pump option, which I had more or less decided on before jumping on the unexpected Amazon deal, was a Pentair Optiflo
Amazon.com : Pentair 347990 OptiFlo Vertical Discharge Aboveground Pool Pump with 2 Speed Motor and Standard Plug, 1 HP : Swimming Pool Water Pumps : Patio, Lawn Garden
Advice or comments would be greatly appreciated!