Here is another example that confuses me.

Pump #1 - 4.5 CFM Output - $920
Says it's for ponds up to 2 acres
http://www.123ponds.com/pa50a.html?utm_s...CFYc6aQodcgoAIA

Pump #2 - 5.3 CFM Output - $200
Says it's for ponds up to 10,000 gallons
http://www.123ponds.com/04280.html

So the second, much cheaper pump has a greater output, but states it's only for ponds a fraction of the size of pump #1

Still lost... smile