the polaris that I inherited with the pool never performed real well even fiddling with the resistance things at the wall port. I always questioned the booster at 1" feeding into the larger pipe. I guess the good news is that the larger diameter pipe goes all the way to the pool!

I showed a friend who is in the market for a new cleaner as well and he ordered the 400 model today so I'll get to see how it works for him first!