What your PB says makes a lot of sense but I'm not sure it negates the use of a two-speed pump. His thoughts on the Polaris and the heat pump both make sense to me but what about the times when neither of those are operating? (which would probably be maybe 70%) Seems like low speed would be fine then....assuming both pump and filter were sized appropriately.

All that said, the PB sounds like a common sense type and I would tend to trust his opinion since he has a good overview of the project. I like his thoughts on zeobrite, too.......no "rush to judgement". The marketplace will determine it's ultimate value. I've seen nothing negative on this forum about it, incidentally.