Hagen Laguna UV Sterilizer/Clarifier 55-Watt, Ponds up to 5000-Gallon

If you are on the fence about purchasing this clarifier, I recommend you go ahead and purchase. We ordered this and my husband installed it in our HUGE Koi and fish pond in our back yard. We have been so happy with the results! Finally...clean, pretty water!

We bought this light for our pond. Our pond is 600 gallons and in the desert which keeps it green year around. We tried chemicals etc. with no results. This light changed all that. Our pond is crystal clear now all year long even during 117 degree temperatures.

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Bigger than what I replaced but more is better than less and it cost less than smaller similar units -Hopping for a green free pond this year

Updated,

Installed on after redoing my pond and did not use right away but after the pond was setup for a month turned on the Clarifier and in about another 3 weeks my pond was completely green. Talked to local pond supplier and said something is wrong or glass may be dirty from use so I took it apart and the tube was broken and one pin was broke off inside the unit and one other was bent over and had green corrosion on them. The green lite was on making it look like it was working.

Emaile the vendor on a Sunday and they got back to me the next day and I sent them photos of the failed unit. They replied the next day and said they are sending out another unit because I was getting green water and you normally have to send the failed unit back to exchange for another but I had a bad situation now in the pond.

Recieved the replacement unit 2 days later WOW I was surprised and installed it the same day and when I turned on this unit the green lite was much brighter than the previous unit so this one is working perfectly.

3 Days later I now have clear water again. All I can say these guys are great they handled everything to my satisfaction and then some.

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The laguna pond clarifier,was in very good condition when it arrived. It was exactly what I expected. Used it all last summer and had no problems at all. Would definately order again.

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-----------NOTE: See update at bottom of review (5-star review dropped to 2-star)---------------

We had a now-discontinued model of a Laguna UV sterilizer for our koi pond for years. It worked like a charm at keeping our water very clear. Our pond receives direct sunlight throughout the day and, without the UV light, the water would green pretty quickly. Also, the smaller koi fish that we stocked the pond with many years ago are now 24"+ and the ever-increasing fish waste helps to feed an even higher algae content. Our original Laguna UV sterilizer stopped working a year ago and, since it was discontinued, we replaced it with a smaller version of this Laguna model. It turned out to be a complete waste of money. It was labeled to take care of ponds up to 3000 gallons (the same as our previous Laguna model), but it simply didn't do the job. Our pond spent a year in a periodic green haze.

I decided to upsize it, and went with this same type model for ponds up to 5000 gallons. So glad that we did. Springtime warming always produces the worst of the pea-soup-green water...the warmer weather is allowing more algae to grow, but the beneficial bacteria are not yet at their peak efficiency to deal with the fish waste that causes the algae acceleration. But, within a few days of installing this new 55-watt UV sterilizer, our water is crystal clear. It's SO nice to be able to see our gorgeous fish again!

As with the others, this Laguna model is easy to install. At approximately 4' in length, it's longer than the other ones we've installed. It can be mounted either horizontally or vertically using simple circular mounting brackets (included). We mounted ours horizontally on the lower edge of our decking (inconspicuously behind landscaping). The unit comes with 2 click-fit connectors for attaching to other connectors. Since this was replacing a like-model Laguna, our hosing from the in-pond pump to the sterilizer, as well as the hosing from the sterilizer to our bio-filter, still worked fine with this one. If this is a first time installation of a UV sterilizer, you will have to figure out your hosing and connector needs based on the other components of your pond's mechanical system.

The Laguna UV sterilizers have small LED lights that are supposed to tell you whether or not the unit is working. It was difficult to tell with our first 2 models. The LED light was so faint that you could only tell if it was on during total darkness. The LED on this new one is much better...plenty bright even in daytime. The sterilizer comes with a 32 foot power cord which makes it more convenient for distant placement. The Maximum Flow Rate is supposed to be 1300 GPH.

I do have a small piece of advice for those not previously acquainted with UV sterilizers. Unless you live in a region that is warm year-round (and where you need the UV light operating all year), remove the unit before winter and store it carefully until the following spring. The lightbulb replacements for these units are quite expensive ($60-80). We were replacing the bulbs annually until we finally wised up and brought the unit in over the winter. We can usually go 2-3 years before replacing bulbs now.

**UPDATE: Less than five weeks after installing, this UV sterilizer stopped working. This has been a learning experience for us to never buy a large-sized product that doesn't include return shipping. Even though the third-party seller accepted it as a return due to its early total malfunction, the lowest shipping cost to return the unit was nearly $70. Never again.

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