Quote Originally Posted by gregski View Post
All of the tests that I've seen show that the aerator pumps are significantly slower than reversibles. The problem is that their flow rate is greatly reduced by any amount of head loss (pumping up against gravity in this case) - you will never reach anything close to their stated numbers like "1200 gph" in any real world application. The impeller pumps do not suffer as badly and will operate much closer to their stated numbers.
I guess I'm in the minority but... while there may be some efficiency loss with the aerator going uphill to the sacs (??), I've timed mine and they take a little over 7 min to fill an 1100 to about 95% capacity. Setup properly for priming with vented loops and check valves I'm going on 3 years without a single issue in my aerator system.

I could see the benefit and ease of reversibles if you have timers on them, but don't timer modules run about $150 a pop?