18W Aquarium UV Light for 100-1000 Gallon, UV Pond Water Clarifier for Koi Pond, Swimming Pool, Spa, Large Fish Tank, Cold Plunge UV Light for Pond Algae Control
$59.99
Price: $59.99
(as of Oct 21, 2025 05:38:14 UTC – Details)
From the brand
Since the establishment of our brand, our mission has been to protect the health of our customers. After years of product development, we have gradually applied our products to various aspects of life, such as household UV lamps, green water cleaning machine, UV light for resin curing, and so on. So far, we have been silently safeguarding the safety and health of millions of American families.
Aquarium Filter&UVC Lamp
Germicidal UVC Lamp Light
UV light
【New Arrival】To enhance product quality and customer experience, we’ve upgraded our packaging to prevent light tube breakage and improved the installation method for the weighted block. And we use dual-tube technology, which makes the UV light much more stable, the BEST gift for your family or friends!
【Quick Disinfection】Harnesses UV-C light to efficiently eradicate up to 99.99% of harmful algae by destabilizing molecular structures and interrupting genetic material within living organisms and bad smells. Suitable for ponds, swimming pool, cold plunge, bathtub of up to 1000 gallons
【Gravity Block & Rapid Sinking】Double sealing, thickened protective covers at both ends, multi-level sealing for underwater use, ensuring safety and reliability during use. Additionally, we have added a gravity block that can stand on its own underwater, achieving 360-degree comprehensive cleaning
【17FT Cable】Having an extra-long cable allows for versatile applications across various scenarios, such as indoor or outdoor pools, ponds, cold plunge pools, spas, and large fish tanks
【High-quality Quartz Glass】High-transparency glass can allow light to penetrate more effectively which means more effective. Be careful not to get electrocuted and keep away from it when using
【365 Days Warranty】In order to help you master the installation and usage skills quickly, we have released a detailed installation video on the listing. The lifespan of the uv light is 8000 hours, we will provide a one-year warranty. If you have any questions, feel free to contact us at any time. EPA EST NO.: 96998-CHN-1
【NOTE】If you are using a fish tank, you can use it in the aquarium filter or use the opaque boards can effectively isolate. If you are using a Koi pond , you can place this aquarium UV light in the pond filter or pond filter screen. It is recommended to use the light for 1-2 hours per day, the BEST gift for your family and your loved!
Customers say
Customers report that the UV light works quickly and effectively, clearing water within a week and killing algae fast in large ponds. The product is easy to install and helps maintain pond health, with one customer noting their pond is thriving. While some customers find it well worth the price, others consider it a waste of money. The build quality and durability receive mixed reviews, with several customers reporting that the bulb didn’t last.
13 reviews for 18W Aquarium UV Light for 100-1000 Gallon, UV Pond Water Clarifier for Koi Pond, Swimming Pool, Spa, Large Fish Tank, Cold Plunge UV Light for Pond Algae Control
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Whalers –
Does a great job killing off suspended green algae.
I had been fighting algae in my Koi pond all Spring and Summer due to a broken inline UV sterilizer. Bought this 18w UV light as a temp fix until a new/larger 55w inline unit could be delivered and installed. Placed this in my waterfall spillway and within a few days the thick pea soup algae was beginning to clear up and was killed off to the point my filters could get the upper hand. Within four days the water was again crystal clear and is now maintaining since I put this in service. Not a difficult install at all. I just placed it in a spot where it would not be visible. This light has performed amazingly at a very reasonable cost. So much so that I am now reconsidering using the 55w inline UV light. Doing an amazing job as advertised.Update: Been in the pond for about three weeks now and all algae has remained under control. One of these is a must have for any pond environment. So much so, that the inline replacement I purchased has not been needed.
mikeJonz –
Works great, cleared green pond within 2 days. Fairly priced, kind of big, do not put near fish
Bought the 18w UV light for my outdoor 125G fish pond. I was amazed how quick it cleared up all the green algae. I put it in the upper portion with the waterfall where the fish cannot go because it stated it can be harmful to fish if put directly in the pond . It is a bit large and did not fit in my filter/pump. I only put in on every few days overnight and it has kept the pond very clear. Prior to this purchase I was using a bunch of chemicals and they did not work too well and I was worried about fish health. I would recommend this product and suggest buying through Amazon as similar lights at PetSmart were way more expensive.
Evgeny Lisovskiy –
Short circuit on a very first attempt to turn on!
I read some reviews about low product operation stability, yet decided to risk it and purchased 32W version. And it’s true: the product itself looks good, well packed, long and thick power cable, but when I turned it on – I had a short circuit right away (probably just in a cord or integrated power inverter). I have a masterâs degree in physics engineering and luckily no one was injured: I have a high-quality newest solar system, that I’ve built myself (Victron) and luckily my 3WA inverter could handle it (cut off the system). It’s absolutely NOT acceptable for this kind of submissive device in water. Manufacturers MUST test each model to make sure it works properly. I was planning to use it in my water catchment tank with rainwater, to prevent algae growth (I have a whole-house high-power UV lamp to clean water going through the water pump). I will search for similar and ready to pay 2x price for quality without a electric shock risk. I suggest that the problem might be with place where cable attached to device – it was 180 degrees twisted, this is where the short circuit could happen. I turned it off very quickly and because of my own transformation system it turned the system off, preventing from worse case scenario. Be careful, please. Maybe your will work properly, but be ready for surprises 🙂 Don’t put it in water, put of solar glasses and test beforehand. Good luck!
Elias L. –
no more worries
I have fought cloudy , nasty , algae water in my koi pond for over 2 years now, enough to buy this 55 watt light 10 times over, in 2 weeks my pond has become the clearest it has ever been. since I put in this uv light. I have a 10,000 gallon pond 4 feet deep. I sunk a 55 gallon drum just enough to have it over flow into the pond with just this light so no movement to possibly break the glass. the only drawback is it is very fragile. I have 26 koi about 18 inches long all are doing so good with the uv light killing the bacteria, I dont plan on ever being without this light again. the light is a lot cheaper than the barley junk that never worked to my expectations. this light has taken away my pond woes!
NJ tradesman –
short time owning
one star off just for time of owning, did a terrific job on my 500 gallon pond. Have two other uv s 9 watt that did not keep up with hot weather temperatures. Use in a barrel water fall, so uv light in not in eyes of fish. Does add a nice night glow above barrel at night, lol. Attracks moths to water now. Happy so far.
Kim Brunette –
Amazing results, highly recommend.
From Green to Clear in 3 days.Now I can see my fish again.I inherited this older pond with new house. After cleaning and cleaning I added fish and the water turned green. I simply cut a hole in my home made pail filter and placed the light in the pail. 3 days later the water was crystal clear.Itâs been 3 weeks and still going strong. Highly recommend.
Jennifer M. –
Good seller that cares about their customers
Killed algae right away. Unfortunately only lasted 3 months.Update: after my review, the company reached out to me and helped with my issue. Appreciate sellers that read and act upon reviews. Thanks.
aamason –
Give it 3 days of light to see a big improvement
Iâm so tired of fighting this pond just to be able to see the fish in it. After two months of working at it, it was clear, just for a mishap to happen and the fight was on again. I have a filter with a light but apparently itâs not working. 2-3 days with the light and viola! It does say not to put the light directly into the pond. It will burn the fish! I put it in a bucket near the inlet so the water circulates around the light, killing the bacteria or what not.I recommend trying this if youâre struggling like me.Update: about a week in and my pond is so clear!!! Highly recommend trying if youâre struggling.
roberto r. –
Cuidado es informacion engañosa un fraude , dicen en su publicidad que se trata de una lampara de imersion pero no lo es, si la sumerges se quema porque trae en pequño letrero en inlges sobre la lampara quer dice NO sumergir
Blaine Jessome –
Good Quality .
Laurie –
We just got the light so havenât got any complaints. It was as advertised and so far no surprises. We are very happywith this product
Amazon Customer –
It died in 35 days, outside of Amazon’s return policy. Contacted the Seller and he cited Amazon’s policy. Don’t waste your money.
Greg C. –
Works great, our pond cleared right up in a week