AA GKM3W Mini Internal UV,Black,AAUV3W-B

Fantastic unit. I had purchased a competitor's product from Amazon that had no impact on the algae at all. This unit is rated less than half of the UV output of the other model and the algae was gone within 3 days!I highly recommend the Green Killing Machine!

Had been fighting an algae bloom making my aquarium water opaque green for weeks and NOTHING was working - daily water changes, keeping lights off, minimizing feedings, etc. Have kept an aquarium for the last 10+ years and never encountered such an issue before. This cleared it right up!! It took about 2 weeks of running constantly, but my water is back to being crystal clear. I can't speak to how long it'll last, but it was easy to set up, affordable, and does what it claims to do.

Returned my first one because the motor was loud and rattling right out of the box. The replacement they shipped me works great and had my tank crystal clear within a week.

The media could not be loaded. I got this GKM for my 10 gallon long tank as well as the next size up (9W) for a larger tank. This 3W sterilizer is barely smaller than the 9 W. I’m actually debating whether I should just get the larger sterilizer even for my 10 gallon.Pros:1) Adjustable flow2) A bit shorter than the 9W version (though really not by much, depending on how you install it) .3) VERY quiet.4) Sponge filter insert seems like it could keep out baby shrimp (though I only just put shrimp in my tank a couple of days ago). You could always but a finer pored sponge, instead. The flow is so powerful that I doubt that it would cause a problem with the function to replace with the finer sponge (remember that SLOWER flow through the filter exposes the problem organisms longer to the UV light, resulting in better effectiveness).5) This is practically “plug and play” in terms of ease of use. The greatest challenge may be finding enough depth in the tank to place it. It’s really convenient not to have to need a canister filter to use this, the way you need to with so many other models.6) No risk of accidentally looking into the UV bulb, which could potentially blind you. This is no exaggeration — I know because I’m an eye doctor.Cons:1) Bulky both vertically and in width.2) You need TWO OUTLETS for this one device. I’m not sure why they didn’t just do the same thing as for the 9W GKM and have both cords connect to a box that then only uses one outlet. 🤷‍♀️ This is annoying and messy, not to mention using up outlets.3) This may or may not be a level 2 UV sterilizer, meaning that it will kill free floating algal blooms, as the name claims, but it may or may not be powerful enough to neutralize (messing up DNA of) bacteria and probably does not kill parasites (such as ich). It’s not clear if these devices have even been tested for the later two purposes.4) Considering that this may be barely above a level 1 UV sterilizer, it’s rather on the pricey side, especially since down the road you will have to replace the bulb and casing, which cost almost as much as the entire machine.5) I get that you don’t have to worry about the casing degrading with UV exposure over time, since you have to replace that whole section at once, but I question how environmentally friendly this approach is. That being said, it is safer than having to handle the UV bulb.

I've had this aquarium for over a year with no issues and suddenly got green and cloudy water. No amount of water changes could eliminate it. I installed the Mini Green Killing Machine in my Fluval 15 Flex Aquarium along with a little bag of Seachem Indoor Purigen Organic Filtration Resin (Item B0002A5VK2). The device fits perfectly in the back chamber of the Fluval Flex. I noticed a difference within the first 6-8 hours and after 1 week a noticeable difference! It seems to just keep getting more clear everyday. The device has two plugs, one for the UV light and another for the pump which I have plugged into little Kasa Smart plugs to be able to easily turn off for water changes. Definitely recommend this item for small-ish tanks!

Was working great in our 6 gallon tank, cleared things up within a few days. Had it for about 5 months before it started making a terrible noise and no longer working correctly. Tank started to have more algae again and we’ve had to unplug it. Have seen that there’s a one year warranty but haven’t been able to find out how to access this to receive a refund or exchange.

This UV pump has saved my fish and my fish tank environment. I was losing fish on a regular basis, but this UV pump has saved my tank! It is easy to use and assemble, and it is extremely quiet. When I first got it, my tank was a bit cloudy and my fishies were not acting right. Since I have put this in my tank, the water is clear, the plants are thriving and so are my fish. I highly recommend this product.Tank size: 10 gallonFish: 3 Rasboras, 3 Gourami's, 3 Platy's

I received my order of the above on 15th Nov 2024. I set it up in my tank on 16 Nov 2024 and let run 24/7 for 2 days. On 3rd day I had to remove the entire unit because it started to electrify my aquarium water and I noticed my fish strangely. I stuck my finger into the water I had a mild electric shock. I had to remove my entire unit. Since then I didn't use the unit and let it dry off completely. So yesterday 22nd Nov 2024 i decided to use the unit again in my aquarium. This time I removed all the fish as a precaution. It seemed to be working well all of yesterday. Then today 23 I noticed the pump unit wasn't working I disassembled it and washed/cleaned the impeller. It totally refused to work. Total wasted of money. I bought it because of the rave reviews. But it doesn't last. Not worth the money spent.