I checked out the web page. Looking at any of the pumps you sell doesn't really help.
For example:
Sequence 750:
3600SEQ12 3200 gph 12 feet 139watts
4200SEQ12 4200 gph 12 feet 140watts
Does this mean for 1 watt I can get another 1000gph? The output is at what head height? Does this mean at 12' of head height it starts dropping off from 4200, 3200 or does it output 0 at 12'?
The Artesian pumps don't run on electricity?
It's really frustrating looking for a pond pump and trying to decide what is the best choice when there is no way to compare anything with anything else.