Easy to set up, appears to be functioning appropriately. Has been in my tank 4 days with absolutely no change in green water.

I was to the point I thought I was going to have to get rid of my tank. With turtles I couldn’t find very many options to get rid of the algae bloom. Water changes weren’t working. It just kept getting worse and worse and worse. It was very depressing to look at in a last ditch effort. I took one more search online and was so lucky to come across the green killing machine I thought the price was a little high, but was willing to take the risk if it really would get rid of the algae bloom. I’m so glad I did. The price is completely fair after seeing how the product performs within less than a week my tank went from murky green and depressing to crystal clear and beautiful. I highly recommend this product to anyone that is having difficulty with algae bloom in their tank.

Lost all hope on getting the algae out of the tank but took a chance on the uv filter and it paid off

Wowzer! Bought this yesterday and already my pea soup in my 75-gallon saltwater aquarium is all but gone. Works as advertised. Decent price.

WOW! Within 24 hours my tank is clear! I have a 54 gallon bow tank, so opted for the larger power head. I have had green algae for over a month and tried everything, this was easy to install and worked incredibly well!

This GKM is amazing 👏🏽 my tanks never looked better I have one on each tank before the GKM was so hard to keep my tanks clear because of my turtles 🐢 one on each tank. After I got the GKM my tanks stay sparkling.

i bought this item and 3 weeks later it stopped working. and can’t get a new one cause it’s past the 14 day of purchase. suction cups stay on for a couple of days before it comes off.

Had an awful bloom after a hermit killed 2 turbos in my display. It was getting worse everyday, by day 5, the worsed morning yet, couldn't see a thing nearly, I ran out, bought this set it up in about 10 minutes. Bloom was gone in less than 24 hours. I know it shouldn't have been that quick, but it was. This was on a 90gallon total volume system. It's very long and would only fit vertically in my display, my 29 gal sump didn't have anywhere to fit it, and I avoided getting an option I would have to plumb as I don't want to hurt my copepods and will only run short term. I ran it for 3 more days and turned it off, only turn on now when i do something silly like stir up my sandbed a lot and cause a storm. Eveb though its fairly tall, its not a total eyesore in the front corner of my display. Powercord design is a little silly, the AC end of it is long, but the DC end is short, and with the size of the brick you can't stick it anywher3, forcing me to put it in the one spot. The controler(?) Suction cups are great and makes for easy mounting on glass in a position that allows everything to be drip looped. I don't know if I would necessarily recommend it as a 24/7 solution because I have not run it this way, but it probably will work that way for most. However, as an as needed solution, I think this is a hell of a lot of bang for the buck.