what I have heard is that they aren't as quiet as they should be, I used to have Quiet One 4000 and 5000 ( this one is still somewhere) but because they were so loud I went with Eheim pumps and thos are really quiet....

.. you may try to put something underneath it so it doesn't touches the bottom glass in sump, or if its outside the sump try to put somehing underneath it ...

 

Sounds about normal...

 

I agree.

I've had 3 of them (4000s if i remember right) each one was not "quiet". They weren't overly loud, but they are like a freight train compared to the Eheims I run now.

I also had a problem with them seizing up (perfectly clean, no alignment problems), to where I had to turn or kick start the impeller through the inlet with a piece of wire.

 

It may be defective, I've seen a lot of QuietOne factory seconds for sale lately that make a sound similar to what you describe. I have a QuietOne 4000 that is silent.

Have you disassembled it to inspect the impeller assembly yet?

 

Ok the quiet one is out. I need some suggestions.

Here is what I need..

Submersible
7 foot head
reasonably quiet
1500+ GPH at 7 foot head

here is one I got my eye on... http://www.championlighting.com/product.php?productid=20816&cat=0&page=1

ANy idea on how to find out how loud it is?

 

I'm not so sure about the Danner Hy-Drive series, the "Hy" stands for hybrid. I'm not sure it's an oil free sub pump, are you planning on using it in-line or submersed?

 

Submersed.

 

Why so much flow for a return pump? Is your tank 350-600 gallons?

 

guessing by his previous post ... his tank is about 260 gal. 50"x30"x40"

 

Thanks. I'm too lazy to use the search function tonight

Personally I just wouldn't use a submerged pump fro that much volume. Too much heat transfer. I would use two eheim 1262s if I had to go submerged and needed that volume.

 

I am starting to lean towards the Little giant pumps.... the 4-MDQX-SC,

Any feedback on them?

 

Another loud energy hog

I like the sequence line with baldor motors, the velocity and pan world pumps. The sequence dart may be a good match for your application at 160 watts (lower if you throttle it back a hair) and they are pretty darn quiet

 

I ordered a Velocity t4... I read nothing but good reviews on it.

What I cant for the life of me understand is how you can read a review on 1 pump that says "This pump is Whisper quiet, I cant even tell its running" and then read another review that says it sounds like a freight train!

Had that experience with SEVERAL pumps... Something strange is going on.

Unreal!

 

Installation could be a factor too. A shallow head on the suction side can make a lot of high velocity pumps cavitate, not enough for wear to be a serious concern, but noise.