Aquarium Air Pump for Fish Tank, Fish Tank Air Pump Bubbler for Hydroponic, Pond Aerator, Commercial Air Pump (650GPH-20W)

The noise level is surprisingly lower than expected. even with a bleed line, the noise can be drowned out by my mini space heater. It does generate some heat. I recommend using good ventilation, hanging the machine, and making sure that the motor isn't being overworked. For example, I'm using this to power 5+ air lines and it still seems somewhat overpowered. If you try to pump all that air through one small tube, you WILL burn out this motor quickly. Do your research and due diligence and this air pump will last you a good while.

Very happy with this strong air pump and it's six outlets. The instructions being Chinese of course do not give you all the information you need to maintain the pump. There is a hidden foam filter under the black circular rubber object on the end. If you "squint" you will see which way to turn it so you can access the filter if it ever needs cleaning. It'll probably burn out before that gets dirty.

Small but powerful , not loud, not quite, puts out a lot of air . Perfect for my needs

I own both the 20W and 30W models of these air pumps, and this review covers both. TL;DR: These are powerful piston-style pumps that offer excellent performance for large or deep tanks, but they're louder than high-end aquarium pumps. If you need the airflow, they're a great value.Noise: The Elephant in the RoomOther reviewers seem divided about noise levels. Since I have two different sizes, I can answer "is this loud?" with a very confident "it depends."Both pumps, especially the 30W model, have a noticeable break-in period. For the first few hours, my 30W pump was violently bouncing around and quite loud. Both quieted down within a week, but neither is truly quiet. Using my phone's decibel meter, they produce about 47-50dB in rooms with 30dB noise floors.For reference, 50dB is roughly as loud as an inexpensive dishwasher, a TV on for background noise, or a quiet conversation. I run my bedroom white noise machine at about 53dB.DIY Noise Reduction Tip: Attach 5-10 feet of 3/8" hose to the intake port and let it coil up—this functions as a muffler and shifts the noise frequency higher (from about 200Hz to around 700Hz), making it less intrusive. Placing the pump on foam also helps dampen vibrations, as neither model is heavy enough to dampen itself.Airflow: Surprisingly PowerfulThe 20W model generates enough air to power four 4" diameter "ultra fine bubble" air discs in an 18" deep tank at full performance, but that's running wide open with little reserve. The 30W is noticeably more powerful—about 50% more airflow.Both are overkill for most hobbyists with standard tanks. You really only need this kind of power with large, deep tanks (like my 8ft long, 18" deep 165-gallon and 36" deep 55-gallon stock tank) or if you're running an actual fish room. I'd estimate you could run at least 18 undergravel filter uplift tubes with the 20W pump.Heat: Warm but Not ProblematicMy FLIR camera shows maximum temperatures of about 40°C (104°F) for the 20W and 50°C (122°F) for the 30W in a 19°C (68°F) room.This is warm but not excessive—remember, these pumps compress air, which generates heat. Neither gets burning hot, and they'll be fine so long as they're not in an enclosed cabinet or something,Power Consumption: Less Than AdvertisedWithout diving too deep into electrical specifics, these pumps use less power than their ratings suggest. The 20W model uses about 11 actual watts, and the 30W uses about 18 watts. The seller is likely referring to apparent power (volt-amps) with their power ratings, not actual consumption. For most home users in the US who are billed on actual power, consider these as 10W and 20W pumps respectively.Quality and ReliabilityUnlike most aquarium pumps which use diaphragms, these are actual piston pumps—think of them as small, high-flow, low-pressure air compressors. This explains the break-in period, especially noticeable with the 30W model.This type of pump experiences more wear than diaphragm pumps but also performs better—no diaphragm pump I know of matches their pressure or flow. I haven't owned them long enough to speak to long-term durability yet, but being inexpensive and somewhat generic (sold under multiple brands), I'd expect 2-5 years of service.Safety NoteI'm not entirely comfortable with what appears to be an exposed laminated motor winding core or metal body on a device without a three-prong plug. I suggest running them on a GFCI-protected outlet, which is good practice for all aquarium equipment anyway.Design FlawMy only real complaint is that the intake barb isn't long enough to fully seat a 3/8" hose because it interferes with the round air filter housing. You need to cut the hose at an angle to make it fit securely—a simple design fix that should have been addressed.Overall RecommendationIf you need serious air movement for large or deep tanks, these pumps deliver excellent performance at a reasonable price point. For standard aquariums, they're excessive and you'd be better served by a quieter name-brand pump from Danner, Tetra, or Fluval.Assuming they last 4+ years, these are a solid value for their performance class. If you need this kind of performance, these move impressive air volume without being unreasonably loud for their capability.

Strong pump, amazed by its size & power

Works great! I read a lot of reviews saying it’s LOUD but I was surprised at how quiet it is for such a powerful pump. We have it under our 125 gallon tank in the bedroom and the noise is very minimal. It’s an air pump. They all make noise. It was also a LOT smaller than I thought it would be. Works great! I give it 5 stars.

DO NOT BUY!! Thought I found the perfect thing to keep bubbles in my pond so ice didn’t freeze solid. Only used it in March (when I bought it) then put it in October before it got cold. It just stopped working after Christmas. Now my pond is frozen and I don’t know if my fish that I’ve had for 8 years will survive. What a piece of crap and waste of money.UPDATE- A few days of this review being posted, company contacted me and offered to replace or refund cost of pump. I opted for refund because my opinion of pump quality hasn’t changed. However, Customer Service from this company deserves 4 stars. Not very common nowadays. 👍

Great product