Hi there..I just finished having an inground pool installed. It holds 16,240 gallons and we have a Hayward Super pump II (1hp) and a 425 sq ft Hayward cartridge filter (salt water pool). I've heard you should be able to turnover your pool water 3 times in a 24 hr period. The installer only used 1.25 inch diameter piping (just finding that out now..it's all finished). According to the pump manual, that will turnove 30 gallons per minute. So it will take 9 hrs to turnover the full pool. This means I'd have to run the pump non stop and still wouldn't achieve the 3 times per day turnover. I read on line the avg diameter used should be 1.5 - 2 inches. I'm not sure why he would have used 1.25 inches. I was trusting he knew what he was doing, but now I'm worried. Can you even change the piping after the fact? Am I going to lose pump efficiency or incur significantly higher electricity costs because he used smaller piping? Any suggestions? Thanks!