• TONMOCON VII Announced | MBL at Woods Hole | Apr 6-8, 2018
  • Thanks for visiting! TONMO is the world's greatest online cephalopod enthusiast community, with interactive content going back to May of 2000, and a biennial conference. If you'd like to join in on the fun, become a TONMO member -- it's easy and free. You can follow us on Facebook and Twitter for more cephy goodness.

PUMPS: Atman Vs. Resun Vs. Oceanrunner


O. bimaculoides
Jan 27, 2005
Hello everyone,

I'm pump-hunting for an 8000 L/h pump to drive a Beckett head skimmer and these are the ones around:

Atman MP-8500 about $58 US
Pentax about $80 US
Ocean Runner about $300 US

and, the RESUN MD55 (an IWAKI clone from China) about $90 US

I'd like to know if people have had good or bad experiences with these pumps - breakdowns, heat, noisiness, etc. I've heard terrible things abut Rios!

I wonder too if anyone knows how to calculate electrical usage rates based on wattage, I'm guessing an 8,000l/h pump is gonna be pretty hungry for power.

Thanks for anything you can share,


Andy Lister

Apr 8, 2004
I've always used Rio pumps (largely because my company market them) and never had a problem with htem.

I've never heard of your first two pumps but Ocean runners are pretty good.

You could always buy a larger pump (ITT have a good range) and use ball valves on them to restrict the flow, this will help you out if you ever need to enlarge your system!

Members online