AA GKM24W Internal UV for Aquariums up to 120Ga,Black
$110.49
Price: $110.49
(as of Oct 31, 2025 14:09:49 UTC – Details)
GKM24W 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 120Ga. Lamp contains Mercury. Manage in Accordance with State Disposal Laws.
Product Dimensions : 4 x 4 x 17 inches; 2.65 Pounds
Item model number : AAUV24W-B
Date First Available : June 7, 2021
Manufacturer : AA Aquarium
ASIN : B096SLPSH5
Best Sellers Rank: #57,359 in Pet Supplies (See Top 100 in Pet Supplies) #207 in Aquarium Lights
Customer Reviews: 4.2 4.2 out of 5 stars 368 ratings var dpAcrHasRegisteredArcLinkClickAction; P.when(‘A’, ‘ready’).execute(function(A) { if (dpAcrHasRegisteredArcLinkClickAction !== true) { dpAcrHasRegisteredArcLinkClickAction = true; A.declarative( ‘acrLink-click-metrics’, ‘click’, { “allowLinkDefault”: true }, function (event) { if (window.ue) { ue.count(“acrLinkClickCount”, (ue.count(“acrLinkClickCount”) || 0) + 1); } } ); } }); P.when(‘A’, ‘cf’).execute(function(A) { A.declarative(‘acrStarsLink-click-metrics’, ‘click’, { “allowLinkDefault” : true }, function(event){ if(window.ue) { ue.count(“acrStarsLinkWithPopoverClickCount”, (ue.count(“acrStarsLinkWithPopoverClickCount”) || 0) + 1); } }); });
The GKM24W Internal UV System with Power Head is for aquariums up to 120 gallons. The GKM24W 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 17″ 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 GKM24W turned on 24/7. This will help increase the life of your 24 Watt UV lamp. Pump Flow Rate: 120 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.
Customers say
Customers find the UV filter keeps water crystal clear and effectively clears algae, with positive feedback about its quality and straightforward installation process. The functionality receives mixed reviews – while some say it works well initially, others report it stops working after a few days of use. Moreover, the lifespan is concerning as units break within months of purchase, and the value for money is mixed with some finding it worth the cost while others consider it expensive to maintain. Additionally, the indicator light feature receives criticism for not working properly.
Christi –
Works great highly recommend if you have algae issues
Great product love it. My tank was extremely drained and it cleared it up right away.
Amber W. –
Ideal unit
Before I purchased the Green Killing Machine I purchased fluval’s in-line sterilizer. When using that product I had an outbreak of flukes, which I fought for months. I had to do a major filter tear down on my sixty gallon display tank.But thankfully, that forced me to do more research on uv sterilizers. Apparently most don’t cut it, especially for parasite control. Live Aquaria has a great uv sterilizer chart that goes over flow rates and wattages that are most appropriate for your tank. (I included a screenshot of their chart, but the information is also worth a read)This particular model meets my requirements. It’s flow doesn’t exceed 150gph and it’s wattage is high enough to control parasite populations in my tank.The only bummer about the unit at all is that it’s large. And it has two ballast boxes. But in a way, that gives me confidence in the unit. Definitely a no bs system. And technically I could have gone with a smaller model (I have a sixty gallon and could probably have used the smaller model) but in the case of uv sterilizers, bigger is better.Installation is straightforward. I don’t recommend turning it on and off rapidly — when you turn it on leave it on for at least a few minutes before turning it off and vise versa (that goes for all advanced lighting systems and will help prevent a blown blub).All in all, I’m grateful that this company is producing an affordable uv sterilizer that’s actually robust enough to kill algae and parasites. And I really appreciate not having to touch bulbs ever again.
Alpha –
works great
works great, better than inline UV’s because this goes directly in the aquariuma nd cost a lot less
Ursula and Roger L. –
Great product — until UV light stopped working after merely 6 weeks. Tank green again.
We WERE so pleased with this product and WOULD have gladly given it 5 stars; however, it simply stopped working after merely 6 weeks (actually 40 days)! We read the troubleshooting guide and tried everything from restarting to checking all connections, etc. to no avail. What a pity! This product really works well — WHEN the UV light is on. Now, we are extremely frustrated!Our tank is 125 gallons and although it took about 2 weeks, the “Green Killing Machine” destroyed the algal bloom exactly as promised, leaving our tank crystal clear. Our fish looked great, the tank was ultra clear and we remarked that we wish we would have purchased one years ago.This all changed, however, when we noticed that the tank was getting a bit cloudy after only 5 1/2 weeks. Figuring it was just temporary, we did not stress over it. Unfortunately, however, it only got cloudier — and greener — with each growing day. Troubleshooting simply revealed that the UV light stopped working. Period.Will be glad to update this post and give it 5 stars if the manufacturer/seller makes the situation “right” by fixing or replacing. However, right now we CANNOT recommend this product due to its UNRELIABILITY. What a shame.
Amazon Customer –
Light stopped working after initial use. The company made it right by replacing the whole unit.
Another update – It turned out that the problem was not the bulb so the company replaced the whole thing and its been working well ever since. The company has great customer service and is here in the U.S.IUpdate- I contacted the company and they said the bulb was likely defective and are sending me a new one. So I’m going from 1 star to 3 stars. If it lasts a few months I’ll bump it up to 4.I ignored the bad reviews and bought it anyway. Don’t waste your money. It worked well but the light stopped working after a few days use. I’d turned it off for a few days to put it on a timer and the light wasn’t working when I turned it back on. For some reason I thought it came with a second bulb, so i wasn’t in a hurry to replace it. It doesn’t and it’s too late for me to return it.
Chase deleon –
Worth every penny!
Cannot believe how big of a difference this made in such a short amount of time (75gallon FOWLR). I was struggling with brown-ish water for over 2 months before finally getting this, I tried everything to no avail. Dropped this in and the film was gone overnight and completely gone by the end of the weekend. If you’re concerned with it burning out quickly, run it initially till the bloom is gone, then set it on a timer to limit usage. One downside is that it can be an eye sore, but well worth it IMHO. Thanks!
casey –
So far Iâd say GREAT
Itâs early, but I never thought I had water clarity issues but wow, this really clears out the water column! I bought to kill any potential bad free floating parasites or algae. But the clarity is amazing after just running over night. I have it in a saltwater Waterbox Infinia Frag 125 gal. I placed it in the sump, in my skimmer tank laying down. Only modification, I put a 1/2â hose from the output pump to run directly to my return pump tank. I donât want to sterilize and put right back in circulation of same tank, I want to sterilize and pump direct back into my return. Hopefully it holds up, I plan to timer cycle it and not run 24/7 and I plan to maintenance clean the pump for longevity
Charlie –
Almost Good
Over the years I’ve purchased several of these units and generally feel that it’s a very good product. However, there is one consistent weakness that irritates me more than a little. The external part of the unit has 4 suction cups that in theory but not in fact allow it to be placed on the exterior wall of an aquarium. Alas, I’ve never had one that didn’t lose suction power and simply fall off of my aquarium. There is a simple fix for this flaw. I pull all 4 suction cups off and put a strip of double-sided tape on the unit. I’m clueless about whether this problem is caused by a design flaw or poor quality suction cups.
jahangir hunani –
Great product, easy to install. I was skeptic at first since you can’t see the light because it’s internal.It’s super easy to install. It took about a week to clear out the algae bloom I had going on in my 90 gal tank.
Amazon Customer –
Hard to get. No longer any supplier in Ireland and unable to import from the UK ( blocked by Royal Mail for some reason). Product description is lacking a description or specification explaining which electrical power is required ( different for USA and Ireland). Obviously need to know this when purchasing.Otherwise I found it to be a very effective product for the purpose for which it is intended.
Lynn Marie –
This UV light cleared my 50 gallon aquarium of heavy algae bloom in less than a week! It was so green you couldnât even see anything in the tank – now itâs clearer than itâs ever been! Very impressed
Jesse Te –
Water was good as new in pretty much 48 hours for a 50 gallon tank with a Yellow-belly Slider. Easy setup.
Charles C Nelson –
Got rid of the algae as advertised, but stopped working after a month … right after the return window closed.I ordered “Nutrafin A7915 Clear Water Clarifier” from Amazon and the results are fantastic. 3 days and all the algae is gone!