Well my 10 year old Hayward 1.0Hp Hydramax2 died tonight. I'm looking at 2 speed options and have found the following:
Pentair 340042 SuperFlo High Performance Energy Efficient Two Speed Pool Pump but I'm not sure about what timer to use to be able to switch speeds automatically.
Also from the reviews these pumps are short on documentation. Any links to detailed wiring diagrams are appreciated.