We replaced a 1hp pump with this 3/4hp tristar - it says it is supposed to be rated the same as a 1hp. My husband picked it out. The pressure coming out of the returns is strong - just as strong as ever, and the pump pressure gauge measures 22, which is what it usually was. We do have the solar panels, and they are bypassed. When they are on, the pressure doesn't raise much - maybe by 2psi. We had to replace the pump (which was only 2 years old), because it must have gotten water in it and the whole inside was corroded. The pump we had before that was a 3/4hp. My husband is sure that the basket in the pump is not letting the air bubble out, because when he basket is out it almost disappears. The basket is a thick one with small holes, which he says is not letting the air disintegrate. I am not so sure . It seems to be cleaning the water, but the water is not crystal clear yet. Could it be the filter? I did have a lot of algae, and after that was killed put in metal out (which can cause cloudiness), but we replaced the pump on Thursday, and although the water is much clearer, it isn't right yet. I was searching on the forum, and I saw a trick to use shaving cream on the intake of the pump. I think I will try this, to ease my mind I know that my husband is an electrical engineer, and knows more about this stuff, but I still don't like the big bubble in the basket - I could live with some small ones, but this is a lot of air Thanks Al for your quick reply