what is the min/max cfm rating?

You would need to convert GPH to CFM. I have 3 8inch air stones running off my 1750gph in a 6ft deep pond.

Does this have any listed warranty? After using it for only a couple months it has stopped working.

These pumps are very inexpensive, so they don't come with a warranty that I know of. At roughly $30.00 per pump a couple of months is pretty inexpensive. Most will work longer. Still, the pump only cost you $15.00 a month. That's only $.50 per day. That's not bad. SB

Would the 18 watt pump be too much for a 150 gallon aquarium?

it will be just fine ! the pump comes with a manifold so you can adjust how much air you want from each separate outlet , i'm using it on a 125 g . (they are not quiet )

ASIN	B08H28HXFR
Amazon Bestseller	#192,331 in Pet Supplies ( See Top 100 in Pet Supplies ) #646 in Aquarium Air Pumps
Batteries Included	No
Color	Silver
Customer Reviews	4.4 4.4 out of 5 stars (1,539)
Date First Available	May 15, 2021
Material	Aluminum
Model Number	ACO006
Product Dimensions	27.51 x 17.55 x 12.95 cm; 3.22 kg
Size	120W, 1750GPH
Target Audience	fish
Use Object	Fish and aquatic creatures

AquaMiracle High Pressure Big Flow Commercial Air Pump 5 Models 600/1000/1200/1400/1750GPH for Ponds, Hydroponics, Fish Farms, Seafood Restaurants

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