The WhisperÂ® Air Pumpâ€™s dome shape actually flattens sound wave frequencies. In addition, each model features sound dampening chambers designed specifically for that model.
And the air pump's rubber feet and suspended motor prevent sound waves from reflecting off surfaces such as tables and shelves. Available in models for tanks from 5 to 100 gallons, these pumps provide a powerful flow of air. UL listed.
I have the Whisper 20 and a Rena on the same tank. The Rena was set up first and was completely silent. I had to touch it to see if it was working. The motor on this one has a loud hum that is audible from across the room. It does what it's supposed to do and is a solidly built unit but I'd buy another Rena over this one if I could do it again.
For about $11.00, the Whisper 40 is a great value. I've got 6 of them running DIY filters in 3 tanks for the past 2 years. Lots of power and best of all...quiet. I know "quiet" is subjective but let me expand. Take pump out of box and plug it in. It will be loud. Attach air line and air stone and place in water. It magically turns silent! The noise literally travels with the air and dissipates by the time it evacutes the water!
I also have a Whisper 100 which is quiet too but for whatever reason, the diaphragms would go out in 3 or 4 months. I never mated the 2 outlets into 1 or anything else I can think of that would be detrimental. Maybe they need a thicker design? Perhaps I got a defective unit (setup/internals)? Perhaps I'll give another model 100 a try but for now the 40's do fine.
Years ago, I used to think Renas were the best. They were the quietest around. BUT they were soooo weak (hence their quietness). The Whisper 40's are 2-3x more powerful than my Rena 300's while still being quieter. I still have a couple 300's and a 100 as backups.
To break it down even further, of the six 40's being used, 2 are absolutely silent, 3 of them are really quiet and 1 occasionally need repositioning (once a week or so) or will quietly hum.
And lastly, these are the BLUE Whispers, not the grey ones at Walmart. I have no experience with those.
I got the 40. I wanted power for a single outlet but mostly i wanted silence.. Well i got 1 of 2. As with most pumps it has that annoying vibration sound/buzzing. If you can live with the noise it puts out a good amount of air. Comes with the connector to adjust air pressure but it is not built in on the unit. Overall it's a decent pump but not the best.
Ratings are submitted by Cichlid-Forum users based upon their own subjective views and do not necessarily reflect the opinions of Cichlid-Forum.com. CF disclaims any responsibility for the accuracy of information contained in reviews submitted by users, or for any damage or liability arising from the content of any review appearing on Cichlid-Forum.com. All product information on this site, including descriptions and specifications, is based soley on information made available by manufacturers. CF disclaims any responsibility for this information or the products listed. Product information may be inaccurate and is subject to change without notice. You should confirm all information before relying on it by contacting either the manufacturer or vendor with any questions about the products or the information presented.