Can someone explain the different types of impellers to me?
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Old 07-05-2013, 05:07 AM   #1
Dan's85
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Can someone explain the different types of impellers to me?


I've been reading a lot about powerheads, skimmers, and pretty much everything else that pushes water and I keep hearing about needle wheel impellers, pin wheel impellers, mesh impellers and I have no idea what the differences are. Can someone please explain???
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Old 07-05-2013, 05:15 AM   #2
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Quote:
Originally Posted by Dan's85 View Post
I've been reading a lot about powerheads, skimmers, and pretty much everything else that pushes water and I keep hearing about needle wheel impellers, pin wheel impellers, mesh impellers and I have no idea what the differences are. Can someone please explain???

AFAIK Needle/Pin wheel impellers are designed and used in Protein Skimmers. The impeller, instead of having flat blade, is made up of blades with a bunch of small pins on them that break up bubbles into smaller bubbles. A bunch of tiny bubbles have a greater surface area for nutrients to stick to before they rise into the skimmer cup.

Mesh impellers are needle/pin wheel impellers with plastic mesh attached to them to attempt to create even smaller bubbles.

Standard Impeller


Needle/Pin Wheel Impeller


Mesh Mod Impeller
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Old 07-05-2013, 05:20 AM   #3
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All 3 are synonymous: impellers with a lot of thin blades. A standard impeller (in this hobby) has about 4-6 'paddles', while a 'neeedle wheel' might have x3-x4 that number.

Commonly used to chop up co2 for better diffusion. A needle impeller that rotates at a slower RPM then a 'regular' impeller is better suited for that purpose.

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Old 07-05-2013, 05:21 AM   #4
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That makes sense. I have heard of people modding a standard impeller into a needle style in powerheads, mostly for CO2, but does the needle wheel flow more than the standard impeller?
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Old 07-05-2013, 05:56 AM   #5
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I am not positive, but I would think you'd get less flow than a standard impeller.
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Old 07-05-2013, 05:31 PM   #6
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The needle wheel impeller does have less flow than a standard impeller. I have 2 Mag-Drive 7 pumps, 1 w/ fractioning impeller and 1 w/ standard impeller and the one with a needle wheel impeller does have a lot less flow than the standard impeller pump and they are the exact same pump with the exception of the impeller.
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Old 07-06-2013, 07:20 PM   #7
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The other sort is found in Koralia and similar power heads. More like a boat or airplane propeller.
You get maximum water movement per watt of electricity.
But I have only seen these in a fairly open set up, not as the power of a canister or HOB filter. I do not know if they work in a pump.
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