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AA GKM9W Internal UV for Aquariums up to 50Ga,Black

  • Based on 550 reviews
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Availability: Only 4 left in stock, order soon!
Fulfilled by Amazon
Arrives Nov 14 – Nov 30
Order within 18 hours and 41 minutes
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Features

  • The GKM9W Internal UV System with Power Head is for aquariums up to 50 gallons. The GKM9W allows water flow in direct contact with the UV lamp, making it extremely efficient. Keep your aquarium crystal clear & reduce water changes.
  • It includes the pump and takes only 5 minutes to install (no tools required). The UV lamp and pump are submersed completely in the aquarium and are attached to the inside of the aquarium with the included suction cups.
  • 4" x 4" x 12" long. LED signals need for a UV Bulb replacement, easy change without tools. UV bulbs lasts for 6 to 9 months, assuming constant use. Sealed UV bulb design - avoid UV housing deteriorate, fresh with every bulb change.
  • Once your water is clear, there is no need to keep your GKM9W turned on 24/7. This will help increase the life of your 9 Watt UV lamp. Pump Flow Rate: 50 GPH. UL listed. EPA Est # 093568.
  • Included components: Water pump, Sealed UV bulb, Control Box, Adaptor. Comes with UL plug, only suitable for US market.

Description

GKM9W Internal UV System with Power Head. Keep Your Aquarium Crystal Clear. Reduce water changes. 5 minute installation without any tools. Sealed water UV lamp for direct contact with water. Perfect for aquariums up to 50Ga. Lamp contains Mercury. Manage in Accordance with State Disposal Laws.

Brand: AA


Material: Plastic


Tank Volume: 5E+1 Gallons


Special Feature: Sealed UV bulb design


Item Weight: 1.08 Kilograms


Specific Uses For Product: Indoor


Style: Modern


Color: BLACK


Included Components: Water pump, Sealed UV bulb, Control Box, Adaptor


Vivarium Type: Aquarium


Product Dimensions ‏ : ‎ 12 x 4 x 12 inches; 2.38 Pounds


Item model number ‏ : ‎ AAUV9W-B


Date First Available ‏ : ‎ July 15, 2021


Manufacturer ‏ : ‎ AA Aquarium


Best Sellers Rank: #34,005 in Pet Supplies (See Top 100 in Pet Supplies) #118 in Aquarium Lights


#118 in Aquarium Lights:


Customer Reviews: 4.3 4.3 out of 5 stars 550 ratings


Item Weight: 2.38 pounds


Manufacturer: AA Aquarium


Item model number: AAUV9W-B


Date First Available: July 15, 2021


Item Package Dimensions L x W x H: 9.21 x 7.52 x 3.07 inches


Item Dimensions LxWxH: 12 x 4 x 12 inches


Item Weight: 1.08 Kilograms


Brand Name: AA


Target Audience Keyword: fish


Directions: Indoor Use


Warranty Description: 1 year limited warranty except tear & wear part


Model Name: GKM9W


Color: BLACK


Material: Plastic


Age Range Description: Adult


Style: Modern


Included Components: Water pump, Sealed UV bulb, Control Box, Adaptor


Specific Uses for Product: Indoor


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Nov 14 – Nov 30

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

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Top Amazon Reviews

    • It takes time, but works!
Review Image by Amazon Customer Amazon Customer
Review Image by Amazon Customer Amazon Customer
Review Image by Amazon Customer Amazon Customer
Impressive Results in Just One Week! 🌿💧 So far, I’m very pleased with this UV filter! We were dealing with a stubborn green water bloom that just wouldn’t go away—until we installed this unit. 📸 Photo 1 was taken on July 11, the day we set it up. 📸 Photo 2 was taken on July 15 (4 days later). 📸 Photo 3 is from July 18—just one week after installation. The improvement is clear—literally! The water is steadily clearing up, and the bloom is anlmost fully under control. Definitely worth the investment if you’re struggling with persistent cloudiness in your tank I’ll update once it is crystal clear. ... show more
Reviewed in the United States on July 18, 2025 by Amazon Customer Amazon Customer
    • This will work on a much larger tank - if you’re patient.
Review Image by Katherine R Gonzalez Katherine R Gonzalez
Bought this for my 125 gallon full blown Danish Style planted system stocked with tetras and small catfish. First foray into fertilizer dosing resulted in a dense planktonic algae bloom (don’t trust the results you get from NO3 & PO4 test kits). Dropped this unit in the system and did a few 1/3 water changes plus photo period adjustments and the water cleared right out. Yes, you can use one of these on a large tank - you just need to be a little more patient as it only has 35gal of actual flow through. It took about 3 weeks to fully straighten out. ... show more
Reviewed in the United States on June 4, 2025 by Katherine R Gonzalez Katherine R Gonzalez
    • Impressed
Review Image by EightInTheNest EightInTheNest
It wasn't as fast as I thought it would be, but it WORKED. After dealing with algae for months, cleaning and changing water two or three times weekly, changing filters and filter media, I finally decided to invest in this. I'm glad I did. I'm happy to SEE my fish again. It took about 3 weeks to get to pretty much clear in my 37 gallon tank. ... show more
Reviewed in the United States on June 13, 2025 by EightInTheNest EightInTheNest
    • Took less than a week to remove green algae from water
Review Image by Joe M Joe M
Review Image by Joe M Joe M
This did a great job of removing the green algae from my 39 gallon tank. I included before and after photos. Keep an eye on your nitrates and nitrites while running this. When this was working I had to do some additional partial water changes to preserve water quality. Now that the water is clear, I have been running this one day each week to keep the water clear and preserve the bulb life. ... show more
Reviewed in the United States on May 26, 2025 by Joe M Joe M
    • Waste of money, tried several times
I have a 20 gal tank and my small UV light died so I bought this one thinking it should have no issue and after the first one failed after a week I got another one and this hasn’t done a thing. The algae went from a small amount to decently bad and I’ve even left lights off in a dark room for several days to possibly help but nothing and now it’s just going into the garbage. The small version worked so much better plus had much better water flow where this one just trickles out ... show more
Reviewed in the United States on June 18, 2025 by Cassandra Felix
    • It takes a few days, but it definitely works!
I had tried name-brand algae killers, and they didn't seem to do much of anything for green water. Acurel-F would keep it nice for a couple of days, but then it would choke the filter. And continual water changes didn't help much, either. I had also tried other tower-style all-in-one UV lights in the past, but all they seemed to do was blast my poor fish across the tank. So, I came across the Green Killing Machine series, but was skeptical. I thought it was just a more expensive name-brand AIO UV light that I'd probably be sending back. But to my delight, it cleared up the green water slowly but surely. While this is rated for a 50 gallon tank, it isn't overpowered for a 10-gallon, which I was also very happy to see. The water flow is gentle, so it isn't launching fish, or sucking in all of their food. Once I had it cleared up, I ended up adding an interval timer, but that's where I docked a star. This uses an external control box (I call it a "control box" but there's nothing to actually adjust on it) and it seems to me that for what this costs, that would be a logical place to put a timer. And keep in mind -- the company recommends a timer to improve the lifespan of the bulb -- so not building one in seems questionable at this price point. That said, the amount of time it's already saved me in backing off on water changes has already more than covered the cost of an interval timer. ... show more
Reviewed in the United States on June 12, 2025 by KN
    • Works awesome
I installed the 9watt in my cloudy 35 gallon Saltwater aquarium and it cleared the water in less than 48 hours. I have the 24 watt version running on my big reef tank and the water is always crystal clear. Highly recommended for quality and price.
Reviewed in the United States on June 6, 2025 by Mhguillie

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