I just vacuumed the entire pool using the old pump with no problems at all... and even though I only tried for a few minutes with the new one and it shows lower pressure on the gauge it's still pressurized everything to where I could hardly turn the handle on the top until I run a back wash and rinse a couple of times and release that pressure... I'm stumped but I'm guessing it's something simple that I'm overlooking and I'm not familiar with this new setup enough to identify it quickly