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	B08H286R34
Air Flow Capacity	2270 Liters Per Hour
Best Sellers Rank	#30,920 in Pet Supplies ( See Top 100 in Pet Supplies ) #251 in Air Pumps (Pet Supplies)
Brand	AquaMiracle
Brand Name	AquaMiracle
Colour	Silver
Customer Reviews	4.4 out of 5 stars 750 Reviews
Item Dimensions L x W x H	14.3L x 8.5W x 9.2H Centimeters
Item Weight	0.9 Kilograms
Manufacturer	AquaMiracle
Material	Aluminium
Material Type	Aluminium
Maximum Pressure	20 Hectopascal
Operation Mode	Automatic
Power Source	Corded Electric
Product Dimensions	14.3L x 8.5W x 9.2H Centimeters
UPC	757249909891
Unit Count	1.0 Count
Whats In The Box1 - Whats In The Box3	Air Manifold, Air Pump

AquaMiracle Commercial Air Pump 600GPH, 18W for Fish Tank, Hydroponic, Bubbler Pond Aerator

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