32W Aquarium UV Light for 100-2000 Gallon, UV Pond Water Clarifier for Koi Pond, Swimming Pool, Spa, Large Fish Tank, Cold Plunge UV Light for Pond Algae Control

Why did you pick this product vs others?:This is a fairly inexpensive device to clear debris from a pond. I doubted it would work but based upon a few of the reviews I read, I was willing to give it a try. Amazing result! Truly! Our pond went from looking more like a mud puddle to crystal clear in 4 days. Thank you to the gentleman who posted a video showing his pond from day one to day four. We had the same results. I can actually see my fish!!!!

The media could not be loaded. I have been battling suspended algae in my pond for months. I tried everything from Barley packs to natural bacteria to chemical additives, but I was very limited since I have fish, plants and snails in my pond. So most algae additives specifically say don’t add if you have snails. I have a waterfall feature with a filter and it even cleaned out the filter to see if that would help. I was getting nowhere.I eventually decided to try the ultraviolet light because I know one other person that’s in the same situation and his works great. So I decided to put it in an area along the waterfall feature and run it for 24 hours a day.For about the first week, I didn’t see much difference. But after about two weeks, it was crystal clear. I’ve been running this light for the past couple of months and have had no issues or reoccurrence of the algae coming back. I highly recommend this light.My water feature is about 500 gallons and I got the 18W. I think that the light can be changed out because they recommend changing it out every nine months, or every season, since even though the light still shines the effectiveness of the ultraviolet light diminishes after about a year. So I’m hoping that this light has replaceable bulbs since I see Amazon cell replaceable bulbs as a recommendation for this light.I’ve attached two pictures of a before and after, and I’ve also attached a video to show where I placed the light in the water. I placed it specifically in that position because all of the water has to pass through that point and also because it’s highly recommended not to place the light in the same vicinity of the fish and the plants because it’s harmful to them.

Burned out within 50 days, 20 days after the 30 day window of return. Otherwise it did kill some forms of algae.

This has been an excellent purchase for us, definitely worth the price. We got this for our 300 indoor pond for our aquatic turtle. It's solidly built and it was easy to install, just plug it in and drop it in the water! I've noticed significantly less smell from the tank since adding this to her set up. it keeps her tank much cleaner. No leaks or other issues so far and I can tell my turtle is much happier.

It has lived up to it's promise of cleaning and keeping clean the algae from my stock tank. No heat, no visible light, no filter - it is strictly a light that does it's job.

I had an algae bloom in my pond. I used a chemical product that was labeled "safe for fish". What the label DIDN'T say was that it should be added when the water is cool. If that isn't possible, only use 1/2 dose. So, not knowing those two things, I used a full dose while the temps were in the upper 80's. Two days later, all the fish were dead. Long story short, I did a partial water change and bought this light. It's only been in for 24 hours and I can already see the water clearing up. I haven't added more fish yet but, thanks to this product, I will be soon.

I was hesitant to buy this but i couldn't beat the price and the fact that you could just drop it in. The uv lamp has a good weight to it and i double checked that the ends were tight. I placed it off to the side near the pump and plugged it in. My pond was pea soup green and no matter what I tried, it didn't help at all. With this light, i saw noticeable improvement in a few days and now that it's been a couple of weeks, it's almost completely cleared. I can't vouch for longevity but I'm pretty happy!

I have had it since Jul 2024 and it broke June 15 2025 almost one year the glass broke, not sure how, however it was in the skimmer box. Does it clear the water yes, the good news is it completely stopped the whole pond from working to avoid electrical shock, however I also believe it blew the GFI as well so I will need to replace because it won’t reset.I plan on buying another one