Just wonder if anyone has any experience with this return pump. I've had a poor experience with mine. I've gone through two impellers in as many hours. I don't understand why. I was wondering about the back pressure possibly. It's a 1" out, and I have it going through 1" hose until it gets to the bulk head, then it is reduced to 3/4". It may be just a lemon of a pump. I don't know. It's been really frustrating though.