Pool Details: In Ground PebbleTec 30000 gallons. Infinity edge is 40'. A 4.5 HP pump currently runs the infinity edge. This pump has 4" pipe coming in and going out of the pump. I want to replace this with a variable speed pump for obvious reasons (energy HOG!). Can I reduce the 4" piping that comes in and out of the pump to 2" on the input and then open it back up to 4" on the outflow side of the pump? The whole run is currently 4" piping. I only see VS pumps that have 2" in and out ports. Your help is greatly appreciated.
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Oh I should mention I want to do a 2 or 3HP VS pump for the replacement. Water currently flys over the edge and I think I can get away with less flow. The edge is very level.