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Your cart is empty.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.
Kateri B.
Reviewed in the United States on September 21, 2024
It works to remove cloudy greenish tinted algae in the water. Really easy to setup. It takes a few days to get clear water. Just make sure it's not a bacterial bloom. Bought the up to 120 gal one for my 75 gallon tank.
Roxanne Gueutal
Reviewed in Canada on August 29, 2024
The media could not be loaded.
J_tish_ism
Reviewed in the United States on July 27, 2024
I purchased this item in late October 2023 and hooked it up a few weeks later. It worked amazing in thr beginning. But stopped working 3 months later. The light comes on and that's it.
Customer
Reviewed in the United Kingdom on February 7, 2024
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.
Tina W.
Reviewed in the United States on October 31, 2024
This works great . My tank always had a green color in my water. Now it is crystal clear. What an amazing difference. I love the way my tank looks. I love mine so much I bought my daughter one too. I highly recommend this.
casey
Reviewed in the United States on January 7, 2024
The media could not be loaded.
Jay Dee
Reviewed in the United States on January 2, 2024
I ordered this to treat a bacteria bloom in my 69 gallon reef tank. The water was very cloudy (milky white). I installed it as soon as it arrived in the evening and by morning time the tank was visually clearer with some haziness. By the third day the water was crystal clear and the bacteria bloom was fully cured. I have since turned it off and the water has remained clear since. Highly recommend for bacterial blooms that likely won’t go away on their own or do so over a long time and put your fish’s health in jeopardy
Customer
Reviewed in the United States on August 11, 2023
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.
Amber W.
Reviewed in the United States on September 5, 2022
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.
Jesse Te
Reviewed in Canada on August 30, 2022
Water was good as new in pretty much 48 hours for a 50 gallon tank with a Yellow-belly Slider. Easy setup.
Ursula and Roger L.
Reviewed in the United States on March 4, 2022
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.
Lynn Marie
Reviewed in Canada on February 4, 2022
This UV light cleared my 50 gallon aquarium of heavy algae bloom in less than a week! It was so green you couldn’t even see anything in the tank - now it’s clearer than it’s ever been! Very impressed
jahangir hunani
Reviewed in Canada on December 8, 2021
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.
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