EcoPlus ECOair 1 Commercial Grade Air Pump 793 GPH - 18 Watt Single Outlet with 6 Valve Manifold

I've been running this pump 24/7 under a fake rock next to my pond for just over a year. Yesterday I noticed that the aeration had stopped, and the sound coming from the rock was louder than normal. Upon further inspection, I found that it was barely generating any pressure. Without resistance, it was still moving air, but there was not enough pressure to drive the aerator.I took it apart to find about a half-cup of fine dust and sand inside the center of the pump (where the motor resides). The piston shaft that is supposed to move up and down between the stators was nearly seized in place. I had to work it quite hard to get it out completely - at which point I'd found the teflon/graphite surfaces so badly scored by the sand, that I immediately ordered a replacement. I had little hope of getting it to work again.However, with a little bit of steel wool and WD40, I managed to get the parts to once again slide evenly. The diaphragms on either side of the piston were dusty, but not deformed or damaged in any way.I thoroughly cleaned all the remaining items, and reassembled it. To my surprise, the aerator came alive with the same pressure/flow I would expect from a new pump.I was quite surprised with how simple the teardown and reassembly was, and it has boosted my confidence in the design and construction. I will keep the new one as a spare, as I suspect the "slop" introduced in the wear surfaces probably will diminish the remaining life.The intake filter (nothing more than a fine sponge) was saturated with sand and dust. Clearly, this was operator error, and I have now redesigned how the pump is mounted under the fake rock. Hopefully that will reduce the amount of debris that finds its way into the pump.Overall, a strong recommendation.

tl; dr: pleased with pump, came with metal 6-valve air tap, only 15 watts when connected to air stones, *much* quieter with long hose connected to air *inlet* to move sound away from pump.We just set up a small garden pond and after a week or so green moss started forming on the rocks and the water got cloudy. Aeration was a common cure so we ordered this pump, some tubing, and air stones. I had never used an air pump or done a pond, and was concerned this would be noisy, but didn't want to get a smaller type of pump because I wanted a lot of aeration and didn't want to do regular diaphragm replacement as the smaller ones require.Plugging it in for the first time inside, with nothing connected, my heart sunk as it was very loud. It also measured around 25 watts on my Kill-A-Watt meter, even though it's advertised as only 18 watts. It turns out that this is the wrong way to evaluate it. With hoses and air stones connected it only uses 15 watts, and is quieter. I placed it outside next to the pond and it filled it with bubbles, and caused lots of circulation as well. It came with a nice metal 6-valve tap, and I was only using three of them (two air stones, and one bare air tube with its valve turned down).The pump was still somewhat noisy though. I noticed the air inlet and read about the noise coming from that, so I connected it to an old garden hose (no water in it) so that it drew air from the end of the hose that was far away, and the pump became almost silent! I was pleased that this last nagging issue had been solved, and my concern over the noise put to rest.Unfortunately it didn't make any change in our pond's green moss growth situation, but definitely not because the pump has any shortcomings. This is one reason I got a powerful pump, so that if the moss didn't reduce, I would know for sure that it wasn't due to a lack of aeration.We only ran this for a few weeks (24 hours a day in Texas summer) so I can't say much about its long-term reliability. Zero problems during our use of it.

Do not cover the pump with a bucket to minimize the noise. It will overheat and stop working. Mine worked again after it cooled off.

I'm using this for about 2200 gallons. My fish are hibernating in extremely well oxygenated water. I ended up just using 4 instead of 6 because it pushes so much air that my 3.5ft pond is getting bubbles everywhere. I had a different kind that needed 6 and still had still water areas. This thing really pushes some air through. It's a slight hum, but this is an outdoor pond and I hardly can hear it. I have to walk to the pump house to make sure it is on. And it's much more affordable that the other brand we had. Our old one had a know that turned it all the way up or down and we had to have it on max all the time, so for us, this one not having that feature is actually nice because you can't accidentally bump it and turn the air flow down. I highly recommend this for fellow fish pond owners. My fish are all happily hiding in their rocks instead of trying to hibernate near the diffusers. Huge yay!

First day review so if anything changes i will revise it but after running it for a few hours i have no complaints. Its quieter than i was expecting. The loudest part is the air coming out of the manifold. Once i got the airlines on it was more quiet than my eco plus i bought a few months back. Really good air output and lots of bubbles. I'll be checking how warm it is later but so far, so good.*update* 5 months of running 24/7 later and this pump is still going strong. There's been no noticeable drop in pressure so far. I have it aerating two 5 gal buckets using pourous flexible tubing rings as diffusers and it puts out a nice steady stream of tiny bubbles. It vibrates a bit (i have the unit on a windowsill and i could hear the vibration in the house when the tv was off)but i fixed that by sitting it on a piece of foam . I have not noticed any smells that some reviewers noted. It does get hot, as other reviewers have said. I can still handle it with bare hands, but you want to make certain you place this somewhere with adequate ventilation. Another tip is: cover the intake port with some kind of filter to keep dust out. I use a small piece of foam filter from a pc fan and a zip tie.All in all i am happy with this pump and would recommend it to a friend.