OXYFUL 9W Non-Submersible UV Ultraviolet 11" Light Clarifier Lamp Filter for Aquarium Koi Pond Fish Tank

This product works great, cleared up my pond in no time. still looks great after a month and a still haven't even changed the filters on the filter box.

Not impressed with this. There’s no way of knowing if it is on or not, my old one had a clear washer letting you see if the light was on inside. I’ve currently had it on my pond and I can’t see any improvement at all in the water.

I've been very happy with this unit. I only ran it two days and my 130 Gallon pond is crystal clear. Very easy to setup and it has made a world of difference.I turned it off after 3 days and I'm curious to see if the green water comes back. If it does I know it'll be gone really quick.FYI: The fittings that come with the unit are 3/4 inch inside diameter.

This product works great it does everything it claims to do. My only problem is that it came without instructions, thank goodness my husband is a plumber so we were able to work it out and put the right fittings in, besides that I am very pleased with the results and the price.

I connected this to the filter on my fish tank and it leaked from every seal. As I tried to tighten one of the connectors it snapped in two pieces. I've tried to cover the broken connection with silicon, and I'll see if it works better after it sets. I did take the casing apart and added teflon tape to try and fix the leaks too.

Love this item, finally am able to use UV light to sterlize the water in my 40 gallon tank. I have a low GPH rated pump which needs water from the tank to this unit and directs the sterlized water back in. Does well against algae and it will kill most things floating inside the water column!

Purchased this to help with my green algae bloom I was struggling with for more than a month. Nothing worked for me, until I installed this sterilizer. In about a week my aquarium went from cloudy green where you couldn't even see the fish to crystal clear.Easy to install too.

To be honest i wish i can give -0 star.I have been building a lot of custom aquarium and i don't know how this item got 5 stars.1. Packaging was bad wrap around with white box (not oem box) but the unit is new. With black marker writing on the box for Model number but no serial number.2. Heavy smell plastic when I opened the unit.3. Poor instructions, says it fits 1/2" ID hose but it's 3/4" barb without fitting step down. Meaning you can have only 1 choice 3/4" ID.3. Poor gasket rings, leaks right out the box, no matter what i did try to stop the leak.4. Contact seller asking question about 1/2" fitting, got no respond. Ok, patient... i went to buy 3/4" hose at homedepot cost me $22 just try to see how this uv light works. I thought the hose was leaking which is impossible, then i found the leaks at gaskets of both side inlet/outlet.5. OK, i gave up... email seller again for refund. Seller never respond, again.I have to contact Amazon to escalate this. Thanks Amazon have the guaranteed protection A_Z. Amazon has refund me.I went back to Corallife Turbo Twist 3X which i had before. Easy, no stress, It always works best for me. I know i get what i paid for...