On a side note,
I have a Hayward 1.5HP 2 speed Matrix pump and I run it all season long in low speed. It uses a fraction of the power your 1HP pump does and still provides more than enough filtering and keeps the water moving. Many say 24\7 isn't necessary but I like it and the 2 speed pumps in low make it more than tolerable. I'm sure a variable speed pump would be even better, I just couldn't justify the cost at this time.
I use high speed only for vacuuming or sometimes if I'm adding chemicals but often not. Honestly, I don't think I could ever go back to a single speed setup. The low speed is so much quieter it's unreal.