OASEVitronic 18 UV Clarifier for Pond

this will help clear up your green koi pond in 7 days it work,, but light buld do not last very long and cost $60 each to replace them, so beward. good product but over price. the unit itself been runing for year now without any problem but I have to replace light in 2 months , was not happy

I've been battling green algae for years. I've tried everything. Chemicals, aggressive filters, countless water changes. Nothing worked for long. I just added a new oase filter, but still had a green pond. Add this attachment and everything changed. UV light doesn't kill algae, it prevents it from replicating. Algae only lives only a few days. Four or five days after installing this, my water was clear. It's amazing to actually see my koi. My only regret: Not buying this years ago.

Amazing unit, easy to install & works fantastic! Only sorry I didn’t buy it sooner. My pond had gotten very green & cloudy. I could hardly see the fish. The info said to give it a couple weeks. It was WAY better in two Days! Clear in 4-5 days.

First 36V clarifier arrived with shattered UV bulb. Seller could not replace immediately. Amazon sent out another unit. I removed that UV bulb and returned. Installed original and it was blowing circuits and would not work. Returned that unit, purchased 18V clarifier from Webb's. WOW. Wish I had done this a year ago. Coupled with the proper sized Oase filter the duck pond water is crystal clear.

This unit is easy to install and change out the lamp.

Fast delivery but no light. After assembly and installation light does not work. I have to wait to call them during their banker's hours when I'm at work and cannot have access to the light when I call.Will update this as soon as I have it working or if they leave me hanging.I called the seller and got an answer quickly and set up the return and refund thru Amazon.I ordered a 2nd light because I didn't want to wait for the return and refund process to be complete before I can get another light. Ok I have the 2nd light a week later and it works (lights up) and I sent back the 1st one today (1 day after receiving the 2nd one) Will update as to how the refund goes and how the light does in the pond.

Worked great, I have 3000 gallon pond with a 5500 gpm pump and waterfall. The water was so cloudy green I couldn’t see more then 1-3 inches. After about 5 days the water is now crystal clear!

My pond is clear for the first time in a year! However, this uv light was not the only fix I employed so I think it's a result of several things....water changes, salt, api products, and a bog filter that I made from a wine barrel. I'm optimistic that this will help keep it that way.The reason for the 3 stars is because the original unit I received was defective. The light worked when tested before installation, but did not work when installed. It appeared that the pin that engages with the internal switch was not making the connection. In addition, the blue button that is supposed to click to lock the light into the unit was not holding.I did what the box instructed and contacted Oase to troubleshoot. Since I work during the day like most people, I had to spend a week of back and forth with the e-mail trying to diagnose the issue. In the end...and after basically being told I was lying...I was giving the option of sending it to Oase for REPAIR under warranty, and if they didn't find anything wrong, I would be charged labor. This was an expensive, brand new item! Sending it in for repair right out of the box is NOT an option.Thankfully, Amazon is great with returns like this. I boxed it up, dropped it off at Kohl's (who knew!) and had my replacement light the next day.Bottom line.... I think Oase products are expensive, but usually worth it. However, Oase needs to do a MUCH better job with their online troubleshooting information and their Customer Service.