Questions about air pumps???

[Brutuscz]

I usually run 2 air pumps for my pond. One blew out today after 2-3 years. My one that is still running is the sonic 2208 4.6CFM 5.8PSI
I am looking to replace the broken one. They make it very difficult to compare performance...some list in CC/min, CFM, liters/min, PSI, etc.
It makes it confusing for sure. The one I am considering is the coralife luft pump of 7psi and 4.0LPM. Is this one as powerful as the one I am running?
Mine is 5.8psi...the coralife one is 7.0 psi
mine is 4.6cu-ft/min the coralife one is 4.0 liters/min.
Which is more powerful? I just want one comparable to the one I have. Thanks for any advice!!

[RayJordan]

I think you must mean 40 lpm not 4 lpm. general reccomendation is for 40 lpm of aeration for every 1,250 gallons of pond volume. I am not sure how to covert CF per minute to LPM?

[MCA]

try this....I already converted all the figures to lpm at various depths

pump up your air pump!