I have a waterfall pump thats 1.5 hp and it pushes so much water, you can't sit by the pool with the falls on and have a conversation. i have the valves backed almost completely off to cut the flow to a more reasonable level, but this has to be making the pump motor work harder yes? The motor has failed and i need to replace it anyway, so i was thinking maybe 3/4 hp with appropriately sized impeller or even smaller, 1/2 horse is that possible? The pump is a Jandy Stealth. Is there a listing somewhere of impeller sizes? I've not seen anything when searching Jandy parts. Thanks all.