Darts with the AO motor migh be a little more but the Baldor ones are 1.4 amp max. .12 hp
I have a apir of the dolphins with the 1/15HP 1.3 amp motor. Very nice pumps as well. I believe the Dart did seem to flow more in my setup, but my dolphins are rated 600 gph less.
Just out of curiousity what do these sintered glass filters cost? Sounds like it sure would be ideal to know someone at this company. Great pumps and filters from the same place would be pretty sweet.
I'd be paranoid trusting my rays with that little bio. I use over a 5 gallon bucket of pot scrubbies, 5lbs of ceramic rings and 1/2 a cubic foot of Kaldness per ray.
Do all the pumps run all the time or is one of them just for backflushing?