Any Negatives on having a 2 speed pump

[CarlD]

Other than initial cost, I know of no problems--and LOTS of advantages. I was shocked to see that my filter (200# sand) works BETTER at low speed. The water seems to have more time to filter.
Lots quieter, too. I rarely run at full speed except when backwashing.

[Jimmy C]

Svengali,

One big negative is that a 2 speed pump may not prime itself if turned on without prime while on low speed setting. This may lead to a ruined pump. There are 2 speed controllers that handle this, but to my knowledge, these are all pretty expensive.

I started a project to build my own 2 speed controller, but so far I have not finished it.

Jim