SLS,

I'm gonna' address two issues you brought up.

150v vs. 220v??? Oops!!

Now, the real reason for my post.....
If I stay with 1 1/2" pipes throughout the max flow is 42 to 44 gpm so I don't really have to worry about too much flow to the filter right?
I have seen this several times on the old forum (R.I.P.) as well and I can't understand the reasoning. If the pressure is high enough, you could get water through the pipe until the sidewalls melted from the friction!! Exponentially greater than 44gpm, IMHO.

Of course pool pumps can't produce that much but I'm illustrating a point (I think!! Am I missing something?)

So, I don't mean to hijack your post but I don't think you can count on 1.5" pipe being the limiting factor in gpm.