I have an external Panworld NH 40 PX that i used for about 2-3 months, It's a great little pump 3/4" inlet 3/4" outlet 15-20 lpm which is about 700 gph @ 21 foot head. When i ran it wide open it splashed the water over the side of my tank, I think they are under rated and are a quality pump. 60.00 is what i paid and that's what i want for it.
Bill:wave: