Sonic linear pump.
SONIC 2204 PROFESSIONAL GRADE LINEAR AIR PUMP
High quality aluminum alloy with streamline design linear air pump, more effective for heat dissipation. Electronic magenetic motion, wearing resistant material for the cylinder and piston, which produce more air and pressure, and low power consumption. Non-oil lubricating design, the compassed air is purifed. Very Compact in size.
Appox Dimension(mm): 186x105 x141 . Noise level is higher.
Suitable for use in fresh and salt water aquarium, Pond and hydroponic setup, also for restaurant seafood system setup.
TYPE: Aluminum casing linear air pump
OUTPUT: 70000cc / MIN = 2.4 cfm
PSI: 4.0
POWER CONSUMPTION: 80W 120V60Hz
http://shop.ebay.com/items/_W0QQ_nkwZsonic...fromZR40QQ_mdoZ
They run a lot less than jehmco. A little more wat use... but not much. mine ran about 60 bucks... compared to jehmco's that was 350+ for what I wanted.
They are marketed towards ponds. VERY quiet .... mine has worked for about 3-4 year now.
I don't know why these aren't more popular in the aquarium trade. Maybe I'm missing something !! But I am happy with it.
I really don't know how many outlets... but I'm running about 1,000 gallons of water.
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Now I also have 3 water pumps. I use them for the 2 sumps I run. They are quiet... but I forget what the heck they are.