AA Aquarium Green Killing Machine Internal UV System

By AA Aquarium
Rated 4.4676 out of 5 stars
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AA Aquarium Green Killing Machine Internal UV System, 3-watt slide 1 of 3
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AA Aquarium Green Killing Machine Internal UV System, 3-watt slide 1 of 3

$49.99Chewy Price

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This Item - AA Aquarium Green Killing Machine Internal UV System, 3-watt
Rated 4.4676 out of 5 stars
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About This Item

  • Promotes dazzling, clear water in your finned friends’ abode.
  • Designed to be easy to install—no tools necessary!
  • Helps remove murkiness from aquarium water.
  • Helps create a green-water-free home for your fish!
  • Comes with a powerhead.
Play Video: Learn More About AA Aquarium From Our Team of Experts
Learn More About AA Aquarium From Our Team of Experts

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Aquarium TypeFreshwater, SaltwaterFreshwater, SaltwaterFreshwater, SaltwaterFreshwater, Saltwater
Fish TypeTropical Freshwater, Marine FishBetta, Goldfish

Questions & Answers

43 Customer Questions

how can you tell if the light is actually on? you cant see it at all , it is sealed up. Pump has flow, but want to be sure its on
Answer by kittenpapaJul 18, 2020
When your water goes from much to crystal clear. This thing is a miracle and took my new 75 gallon tank from heartbreak to crystal clear in a few days.

Do I need a regular filter if I use the Green Machine?
Answer by ChewyAug 09, 2018
You can use the filter in your tank, but this sterilizer does require a specific sponge insert. Replacement sponges (model RUV09W-S) can be purchased from the manufacturer site.

My water is crystal clear now If I have no timer how often should I turn on machine
Answer by ChewyNov 11, 2020
UVC bulbs typically last about 6-9 months in constant use. Some bulbs can last up to a year. To lengthen the service of your bulb, we suggest once your water is sparkling clear for 7 full days, start using your UV on a limited as needed basis. Run it with your light timer or only on weekends, etc.

After I do a partial change, I add good bacteria. How long should I keep the sterilizer turned off?
Answer by ChewyFeb 23, 2021
There are times that you do not want to operate your Green Killing Machine 24/7. We would recommend turning the GKM off for 1 week to allow the added good bacteria to grow on the bio filters. After that, use the GKM as needed to maintain desired water clarity.

ReviewsWrite a Review

Rated 4.4676 out of 5 stars
216 Reviews
Would recommend to a friend

216 Customer Reviews

Rated 5 out of 5 stars
By GigiS on Nov 1, 2022

Works on my 80gallon perfectly

I love it, my cats see their fish buddies now that the murkyness is gone and the fish engage my cats going from side to side in aquarium. Really cleared up the aquarium, a true blessing. Going to clean it up every 3 months to keep it working nicely. I have two larger filters and that requires four bags. However despite everything the water seemed slightly merky. However after putting the 9Watt in its crystal clear and makes cleaning my tank easier, and my plants are really thriving now as well I noticed. Will be buying a 2nd one for my other Fish Tank and my Hermit Crabs water tank.

Rated 5 out of 5 stars
By JuneB on Nov 7, 2022

Works Great on Green Water

I got both a 9W and a 24W for my 2 aquariums having trouble with green water. Part of the problem is the water quality where I live, but this was just latest problem. Started clearing the water in 2 days, but took 5 days to fully clear the water. This works best for clearing the single cell organism that causes green water, but not as effective a regular algae that grows on everything.

Rated 1 out of 5 stars
By Katt on Nov 3, 2022

Terrible Product

This product is awful. This is the second one I have bought. The first time from a local pet store and this second time from here. They do not work past a couple of weeks. I bought the proper one for my tank size. It cleared up the water, but then after a couple of weeks broke! After buying two of these, I will not be buying a third one.

Rated 5 out of 5 stars
By MattyM on Sep 22, 2022

Quiet, Adjustable Flow - Amazing Job on my 20 gallon

Went from pea soup to very clear in 8 days. It's quiet, has an adjustable flow rate, and stays put (tip - wipe your glass off before mounting). The suction cups are good - I did have to remount it once so far, not a big deal. My tank is now thriving, and even though there's still a slight green tint I think it's clearer than it's ever been before. I'm going to run it another week or so to be sure I'm completely rid of the algae bloom. Great product and great for the health of your tank.

Rated 5 out of 5 stars
By DIYer on Nov 11, 2022

Worked for Dinos

I used this as part of my 3-day Dino (saltwater) eradication plan, and it worked well. I run it for a few days each week now to keep them away. There are concerns about the impeller shaft releasing toxic elements into the water though, if it crashes my tank I'll change my review.

Rated 5 out of 5 stars
By AquariumLover on Oct 17, 2022

Amazing Results!!!

I used the green killing machine when I had a bad algae bloom, even though skeptical. It worked wonders! Love it!!! It took about 4 or 5 days to be Crystal clear!! I will always use this for preventative measures now.

Rated 5 out of 5 stars
By Nms1976 on Nov 29, 2022


Was having the worst problem with algea bloom causing green cloudy water.... was at my wits end.... but this UV filter got my 30 gal tank back to tip top shape in 3 days!!! Highly recommend this filter!

Rated 2 out of 5 stars
By David on Nov 24, 2022

Works great for 4 weeks

I was so relieved to finally have our algae bloom problem solved about a month ago when i installed the larger sized model. A few days ago it just stopped working. What a waste.

Rated 5 out of 5 stars
By Stephanie on Sep 12, 2022

GREAT Product

We were having LOTS of problems with our fish tank. Too much algae as one example. Once we got this as well as a second filter-Marineland Bio-Wheel Emperor, onto our fish tank, we have not had a single fish die and we have not had any problems. We barely even have to do any fish tank water changes. So much easier. We were having to do water changes every day/every other day before this machine. We have not had any algae whats so ever. We have even had to start feeding algae tablets to our pleco.

Rated 5 out of 5 stars
By Chris on Nov 4, 2022

AA Aquarium Green Killing Machine

This worked amazingly well in my 55 gallon tank! Saw a slight improvement after 24 hours but after 4 days the tank was clear. For me it was worth the expense and I'm happy with the results.