I'm looking for some opinions from the pump wizards. I've got a Hayward S180T sand filter (150lbs) paired with a Hayward PowerFlo Matrix pump. It's a 1.5 hp motor, but it has the 1hp impeller installed. As I've been reading these pump forums over the last few days it seems more and more that I still have way too much pump for my filter. I was thinking about swapping out the impeller and installing a 3/4hp impeller instead. My thoughts are that my flow rate will slow which will improve my filtering (my pool gets really dirty with that fine dust in the summer), improve my electric bill, and reduce the load and thus improve the lifespan on the pump.
Is there any reason I shouldn't do this?