Hi, Ken,
Can you find a GPM rating for the filter? It is a pretty good rule of thumb never to exceed that rating with a pump that will push more than that thru it.
It should be pretty easy to find a pump curve at a web site that will help you select. mas985 is good at total dynamic head (I'm not) but I believe he says most pools have a TDH around 40...you'll need to know that to figure how many gpm your pump will push.
Next, your system should be capable of turning over your pool gallonage in an 8-12 hour period. With a two-speed, that may be somewhat hard to do on low but easy on high.
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