Garbage. I picked it up from the store when it had a broken and wet box and was assured that it would work and if it didn't then I could return it. I tried it for a few weeks and this doesn't work at all. Then I was denied a return saying it was not eligible for return. Now I'm doing a charge back from my credit card for this useless $70 item. Such a terrible experience.

I bought this for my 75 gal aquarium. The directions were to wait may be upto 2 week. By the 4th day my aquarium has never been cleaner. My fish even seem more energetic! So far so good! My aquarium is my a window and so I have had on going issues with algae. This killing machine seems to have fixed that.

It worked for three weeks and then the unit died. Big waste of money.

The 9W Green Killing Machine cleared the water in my 45 gallon aquarium in 7 days! My aquarium has been set up for over 8 years and I always had clear water. In January 2025, I replaced my old (failing) fluorescent light with a new, brighter Fluval LED light. The aquarium looked great, but after several weeks (and 2 cleanings & water changes), the water started turning green. After a few days, I could not view into the tank more than a few inches. This was the first time I experienced an algae bloom. (There were no other changes to my aquarium other than the new light.) I realized I needed to reduce the hours the new LED light was turned on, but still needed to clear the water. Based on a recommendation from my local fish store, I purchased this UV sterilizer (in mid-March 2025). It was fairly easy to set-up. Within a few days, the water started to look clearer. Within one week, the water was crystal clear again.

I bought this 5 days ago because my aquarium got overran with green algae very quickly. Within 5 days, my water is crystal clear!! I couldn’t be happier with this purchase.

This sterilizer does exactly what it is supposed to do. Took a few days to clear up my green and murky tank water. The reason I can only give it 4 stars is because I just watched one of my cherry shrimp swim into the outflow opening, and he came out in chunks about 10 seconds later. If you have curious small animals in your tank, be cautious.

It worked great, but for less than 3 months. At this price, I'd expect it to last longer.

This thing is amazing. After the first night I could see a big difference, by day 3 my tank is almost completely clear