I have what started as a natural pond without filtration, just aeration. No koi, just goldfish, minnows, warmouth, snails, and bullfrogs. The pond cycled in clarity for the past year, and this past month it stayed a dirty brownish color. This filter pump cleaned it up within a week to a decent level of clarity, I am not going for crystal clear water, I just wanted to see the first and second levels and not have it look too dirty. The first level is about about 18 inches, the second level is 3-4 feet, and the bottom is 6ft. The pump sits on the second level with a hose used to make a natural-looking waterfall off one of the rocks. The fountain also worked well on the 18" level which I tried first before the hose came in. I cleaned out the filter after 2 days and I am going to clean it probably every week and see if that works. I throw the filters on concrete and blast them with a garden hose. I tied the handle of the pump to some paracord rope to pull it out of the pond, which works well as the pump is somewhat buoyant and pulls up easily. I keep the pump running right until I pull it out of the water and set it to the side, then immediately unplug it. This keeps some of the nastiness from escaping as I pull it out of the water.I live in Florida and have a 600 gallon pond filled with oranda goldfish. Have bought two five in one pumps and a couple other options. None cleared my pond like this one. My pond had been without a pump for a week when this came. You could not see fish through algea bloom that resulted. Put the new pump in at 1:00 pm. Could see fish by 5:00 pm. Pond is clear next morning. If it lasts even 6 months, it is better than anything I have bought before.I’ve been enjoying fixing up my water garden. I was worried this pump would be too much for my 350 gallon Rubbermaid tank. It’s perfect! Before it was always green from algae. After a few days it was completely clear. Love the adjustable fountain head. It’s extremely easy to clean. After a few weeks it’s keeping the water garden clean & the filters don’t need to be cleaned often. It’s easy to lift out & hose off. Very powerful pump! The fish are enjoying the clear water. The negative is the seller. The UV light doesn’t work. Wrote the seller but no response. Don’t expect help from them. The instructions are a joke & there’s no phone number, email, address or website!This is an amazing filter, In about 3 weeks it turned our pond from green to clear. I can now actually see the bottom of the pond.One week in the pond and it’s much cleaner. The filters are easy to take out and clean. The spray is very nice and adjustable. Our pond is 800 gallons.As stated. We got it fast, it's already assembled except for choosing which fountain head to use, and it seems to move a lot of water.I would recommend this filter for small ponds to anyone.If you have pond deeper than the high of the pump then it hard for you to extend it, and there is no instructions at all, besides that it’s good for your pond.