OXYFUL 18W Non-Submersible UV Ultraviolet 14" Light Clarifier Lamp Filter for Aquarium Koi Pond Fish Tank

We have a 1500 Gal Koi pond. Living in S. Calif, we go through extreme temperature fluctuation. We used a 9W ultraviolet to control algae, however, with algae blooms, a 9w bulb would not do. So we added this unit to our plumbing. The advantages to this unit are two fold. 1: it has a high flow capacity with 1.25 inch ports. 2: It doubles the wattage of 9w UV algae killing light. Installation is easy with Port adapters provided for various sized pipes. Replacement bulbs are readily available. And most important, there is no need to shut off water flow to change the light bulb. This is a product provided by a company I would definitely do business with again. They responded quickly to email questions and were very helpful. THIS IS THE SPOT FOR POND EQUIPMENT.

I've owned a couple of these over the years for my pond. They seem to last 2-3 seasons if you are careful with them. I struggled with green water this spring then realized my old UV filter was shot. I've an 800 gallon pond and this filter cleared up my water in a matter of a few days and kept the water crystal clear all summer.

It leaked as soon as I set it up. Tried adjusting the large orange O ring. It still leaked so tried again, at which point the O ring broke in two pieces. So now I’m struggling to find a replacement O ring.Update: Unable to find a replacement O ring. Tried another ring but it was too large. So now I have an unusable $65 uv clarifier as I am past the allowable return date.Update #2: Thank you to Angie at WYZ for asking me to contact the company, and for sending me a replacement O ring as the product was still under warranty. It works and I'm starting to see my fish as well as the bottom of my bathtub pond!

Awsome, cleaned pond! update since Feb 2019, unit does not work now, bulb burn out, got a complementary bulb from seller WYZworks, it turns out the unit not getting power, so i am out a $64 unit. The motor on the thing must be burn out. Email WYZworks they said the manufacture Oxyful had a one year warranty, but no one can tell me there customer service number and i cant find nothing online for a number. If you know the company please email or post on here.

My Koi pond went green as green could be. I tried a few algae shock treatments with no results. I literally could only see about 3" down and my pond is only about 2.5' deep. I bought this UV light, hooked it up at 6pm and by 11am the next day the water was pretty much crystal clear. No joke! My pond holds about 350 gallons. This product is legit.