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!

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!

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!