It took me about 6 months to actually get around to installing this in our pond, mostly because I was redoing the waterfall but I'm also quite lazy.
Previously I had tried using a 200 gallon gravity filter, media filtration, and a skimmer/pump combo. In all cases there was little improvement on algae blossoms, mosquito larvae, and water quality. After talking to a local shop, I sought out this specific filter because they had a lot of success with a showcase koi pond located behind the store.
After reading the relatively detailed instructions and following the advice of pond enthusiasts, installation took about 4 hours due to the rocky soil (it doesn't have to be in the soil but can sit flush). Since filtration efforts had been miserable failures prior to this, my hopes were high but my expectations sat far lower, so I plugged it in and went about my business.
Two weeks to the day, my pond is clear enough to make out fine details along the bottom; including areas where green frogs have burrowed into the muck. Not only is the pond clear enough to make out fine details, I finally discovered where a slow leak was coming from (liner is sinking). As a final reward, of sorts anyway, there was also a revelation in finding two long forgotten lawn ornaments, a bunch of toys tossed in long ago by my daughter or her friends, and the skeletal remains of a cat.
I will have to wait until spring and summer to see how well the UV works on controlling algae at peak levels of sunshine and mosquito larvae but with the rapid development of clarity I am feeling confident that we'll be able to maintain good water quality. Highly recommend this filter!