After fighting with green pond water for a few years I decided to try a UV light. Shipping was slow but... Once item arrived I had to call manufacturer for instructions for use. Item included assembly directions but none how to hook up to pump/filter. Once in place I could see a difference within 24 hours and within 5 days my pond was clear! Good product just needs better instructions. Would buy again!

Over the years, I have tried several different Ultra Violet Pond Clarifiers.....this one by far excels above the rest. I like the fact that it has an area on it that lets you know if it is lit and working. Has really kept my pond looking great!

The pond water was greenish brown with tons of algy growing - within one week water was crystal clear and could see the Kio fish again.Thanks

I'm using this in a small pond that uses a 1/2 whiskey barrel to create a waterfall. I simply put the filter in the whiskey barrel and inserted the tube from the put into one end (it slide right in). I didn't need to another tube on the outtake. It has been running for about 2 wks it has noticeably reduced the algae.

I have had this lamp installed in my 160 gallon pond for about a month now. I spend two years fighting a losing battle against blue-green algae. I tried everything from chemicals to changing the filter twice daily. Nothing came close to working but after two days of using this uv lamp my pond was noticeably clearer and after a four I could see the bottom. The lamp works well for a pond my size. Other reviewers have noted problems with the fittings. They were a standard 3/4 and I found no problem picking up hose from the garden section of the local Home Depot. For the adapters, if needed, check out the plumbing isle. I would recommend this product to a friend.

This a good item but it was too small for my use. I returned it with no problems and got one bigger.

I thought I would try a UV clarifier since nothing else was helping my ~800 gallon pea soup pond. My husband bought some tubing and clamped the ends to our pond filter (also a Pondmaster), placed everything at the bottom of the pond and plugged it in. Within a week we could see 1/2 way down (3' deep) and 2 weeks later it is clear! We are very happy with this purchase.

I just put took the clarifier out and put it away for the winter. It kept my pond crystal clear all summer long. Wish I had invested sooner. Love this item!

This is the 10 watt Supreme Pondmaster Submersible UV Clarifier, model 29101. When water is circulated through it, the water is exposed to ultraviolet light that is capable of killing both suspended algae and bacteria. I have used several of these units in both marine aquaria (outside the tank) and in my pond (in the water) and they have performed perfectly.The unit contains a tubular UV bulb protected by a slightly larger quartz sleeve. Danner says that the design causes the water to flow through the unit in a circular manner but I have never cut one open to see how that might be accomplished.Build quality is excellent and I have had no problems with leakage of water either into the interior quartz sleeve and UV tube or out onto the floor.It is important to remember that the quartz sleeve will gradually become partially occluded by deposits on the outside surface. For best results, you should disassemble the clarifier periodically (monthly is about right) and remove and clean the sleeve. Disassembly is quick and easy but be careful with both the sleeve and the tube when you do it.The clarifier works well but beware: Danner advertises that the 10-watt model will be adequate for ponds up to 1500 gallons. This is extremely optimistic. If you begin with a pond that is absolutely clean and algae free, the 10-watt model might keep it that way, if used in conjunction with a good filter. However, if you are installing the clarifier to deal with a pre-existing problem, you should probably not count on it working well for ponds over 500 gallons. My pond is 650 gallons and the 10-watt device is barely adequate. There is relatively little difference (about $30) in the cost of the 10-watt and 20-watt models and using more UV than you need doesn't harm anything and adds at most a few pennies to you electricity bill. If in doubt, go with the 20-watt model.Also, the specification calls for a 700gph pump (1800gph for the 20-watt model). Do not think that you can improve performance by using a larger pump. You probably won't hurt the device but the water will pass through it too quickly for the UV to kill the nasties. A pump that is too small just reduces the speed with which the entire volume of the pond passes through the clarifier.One last caution: DON'T LOOK DIRECTLY AT THE UV TUBE WHEN IT IS ILLUMINATED NO MATTER WHETHER IT IS INSIDE OR OUTSIDE OF THE QUARTZ SLEEVE. YOU CAN DAMAGE YOUR EYES IF YOU DO SO.

This was one of the only fully submersible in-line clarifiers I could find, and it was reasonably priced here. Unlike some reviewers, I had absolutely no problem hooking it up to my Pondmaster filter and pump with standard 1" tubing. Easy to set up and cleared up my small pond within 3 days. The glowing ring is very helpful to let you know it's working.

I hesitated to spend the money for a UV clarifier, especially given that I would have to replace the bulb every year. But last season, after I did the math, I found that I was spending more than the price of a bulb on non-effective chemicals. Within a week of installing the clarifier (which I found to be an easy task) I could see the bottom of my pond. Woohoo!

This UV filter works, but there are some strange issues with it. Hopefully my review will help other customers avoid the hassles I went through with this item.The inlet/outlet barbs on this filter are supposedly sized to fit 3/4 inch tubing; however, oddly, the barbs are significantly smaller than they should be, so tubing goes on, hangs loosely, and then falls off if you move the unit around much.In my experience with other pond products with barbs, barbs are designed to hold tubing quite snugly, without requiring the use of clamps (this is especially important if you have to open up the unit every month or so to do the recommended cleanings of the interior light cover, where clamps would be a major pain). There are no threads or any other way of securing tubing to this UV filter.The issue of how to attach tubing to the unit caused a great deal of confusion for me when I first got the product. I took it to several local pond supply stores to see if they could help me figure out if I was doing something wrong. The pond supply folks were as puzzled as I was about why the barbs did not fit standard 3/4 inch tubing. We tried other sized tubing, but nothing fit properly.I emailed the customer support people at Danner Manufacturing (the company that makes these filters). Their staff were entirely unhelpful. Eventually, the best they could manage in response to my request for instructions on how to attach the unit to tubing (and ultimately to my Pondmaster pump/filter unit), was to send me a sketch showing a UV filter attached to a pump (but no instructions or diagrams on how this was actually accomplished). This sketch was supposed to demonstrate that it was theoretically possible to attach the UV filter to other equipment. When I followed up with several emails asking them for details on -how- to attach the tubing, I received a message that they were researching what types of adapters were needed, but then a week went by with no further communication from them despite an additional query from me. At that point, in frustration, I gave up on receiving any kind of customer support.As the algae was continuing to build up in my pond and I was increasingly concerned for my fish, I decided to just try running the UV filter with the tubing loosely attached just to see if that would somehow be good enough. Lo and behold, when the UV filter is running, even if loosely connected to the pump via 3/4 inch tubing, a certain amount of suction occurs, allowing the tubing to stay connected (as long as you don't bump the UV filter or the tubing).What this means is that, if you have a person to help you (holding the pump and any other attached equipment while you hold the UV filter and it's tubing), you can lay all of your equipment into the pond carefully, being sure nothing gets disconnected in the process, and then turn on the pump and UV filter. If everything stays connected, when you turn on the UV filter and pump, everything should stay connected -- as long as you don't have big, heavy fish that like to nudge the tubing or any significant currents where your equipment is located.Personally, I find this to be a tedious process (which will have to be repeated each time I clean the UV light cover and/or my filter), and I don't appreciate that there were no instructions about any of this included with the product. I also did not find Danner Manufacturing to be at all helpful in resolving this issue.However, once I figured it out... the UV filter does do its job wonderfully! The pond is free of algae after about a week of run-time. I just wish I had known how to solve the installation issues and hadn't wasted so much time trying to figure this out.

We had green soup and in about a week or two we have clear water. We are pleased with the product.

The filter came on time and was easy to install. Within a week we could see the bottom of the pond and the fish. Our pond is about 400 to 500 gallons so this size was just right. Looking forward to next spring when the pond usually starts clouding up. I want to see how it performs then.

This U V light system works amazingly well. Simple to hook up and use and very effective, cleaned up our pond water even faster than I expected. Our neighbors that have fish ponds are still cleaning their foam/mesh filters at least once a day and their ponds are still green. I'm cleaning my pad filter once every three to four days now and our pond is crystal clear. Very impressive that something this simple would work so well. I would highly recommend this pondmaster UV water filter to anyone.

Product was not compatible with my pond filter.You credited my account very quickly.I certainly will do business with you again.You can be trusted!