[MCA]

Well, in our little world of koi keeping...we don't have Consumer Reports testing of the components we use. Danged if would not be nice if we did have those!

I did a comparison of some pumps regarding the air they can deliver at several depths. This survey did NOT include all available brands. But it gives you an idea of which brands/models may fit your pond system needs.

For example...want to deliver 120L of air to a Nexus or other 1meter deep fluid bed....no problem. Most any brand's 120L models, will do the job...but using different amounts of power. But try to drive 80L to a diffuser dome at 8' deep. This is where you can see than the Medo line of piston pumps just can not deliver to high backpressure.

Remember you need to balance capital expediture (cost of the pump) with operating expediture (electricity plus replacement parts) and performance (air volume delivered at specific backpressure.

For our needs I use an Airtech 120 on each nexus and an Airtech 80 on each BD at 8'. Works for us. Our Airtechs sit outside in the filter pit.