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
Batteries Included?	No
Best Sellers Rank	#45,304 in Pet Supplies ( See Top 100 in Pet Supplies ) #2,565 in Aquarium Accessories
Brand	AquaMiracle
Color	silver
Customer Reviews	4.4 4.4 out of 5 stars (1,182)
Date First Available	21 March 2021
Item model number	ACO001
Manufacturer	AquaMiracle
Material Type	Aluminum
Power Source	Corded Electric
Product Dimensions	14.5 x 8.51 x 9.5 cm; 900 g
Size	18W, 600GPH
Style	18W-600GPH
Wattage	18 watts

AquaMiracle High Pressure Big Flow Commercial Air Pumps 5 Models 600/1000/1200/1400/1750GPH for Pond, Aquarium, Hydroponics, Fish Farm and Seafood Restaurant

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