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Old 08-05-2009, 06:24 AM   #1 (permalink)
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Default Needle wheel pump

I was reading a thread and thought what the heck is this? I must have missed the boat when this topic came up. Anyone care to explain what this is and why it so much better then ceramic diffusor in the water flow. From what I gather you run the pump externally into the return of your canister and bubble the CO2 into the pump?
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Old 08-05-2009, 06:52 AM   #2 (permalink)
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Default Re: Needle wheel pump

The pumps are used mainly for protein skimmers. But for our application it works very well and has a few added benefits.

One would be you get added flow to the tank.
2nd. You get tons of fine mist distributed in the tank much like a Mazzei or diffuser.

The impeller is a little different than your average impeller. Its needle like instead of paddle like. This is what provides the fine mist.

I hope that all made sense..
http://www.plantedtank.net/forums/eq...-impeller.html

-Orlando


P.S

You dont have to plumb them into filter lines. I use them on there own separate loops...
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Old 08-05-2009, 06:55 AM   #3 (permalink)
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Default Re: Needle wheel pump

I just got one... I have high hopes.



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Old 08-05-2009, 09:22 AM   #4 (permalink)
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Default Re: Needle wheel pump

I've been using them for a while, and think they are great.
extremely efficient, and easier to dial in than mazzei. (my opinion)
the only downside, which I consider an upside is the microbubbles.

microbubbles of CO2 enter the water column and are spread all around the tank.
some say they are unsightly, I say they help me visually manage flow.
If I see microbubbles entering and leaving the plantbeds, then I know flow is good.
this has been extremely beneficial to me when managing dense plantings.

a couple feet back from the tank you cannot see the bubbles.
for closeup photos you can shut off the gas.
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Old 08-05-2009, 09:30 AM   #5 (permalink)
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-O
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Old 08-05-2009, 12:06 PM   #6 (permalink)
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Default Re: Needle wheel pump

Adding a pump to the return of a canister significantly boosts the canister output. Running a closed loop will increase water movement in the tank even further.

The main benefits over a ceramic disk are bubble size and lack of cleaning. Some people claim to have ceramic diffusers that produce ultrafine, mist like bubbles, but I have yet to see one. A plumbed needlewheel produces extremely small bubbles.
Ceramic diffusers do best with regular cleaning, if needlewheel pumps ever need to be cleaned at all, it is very infrequent.

Overall, it is just another way of getting CO2 into the tank. If you already have adequate water movement, and a well functioning ceramic disc that you don't mind cleaning, then there really is no benefit.
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Old 08-05-2009, 12:17 PM   #7 (permalink)
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Default Re: Needle wheel pump

Orlando-
can't seem to find it on your site...?
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Old 08-05-2009, 03:07 PM   #8 (permalink)
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Default Re: Needle wheel pump

Quote:
Originally Posted by ashappard View Post
I've been using them for a while, and think they are great.
extremely efficient, and easier to dial in than mazzei. (my opinion)
the only downside, which I consider an upside is the microbubbles.

microbubbles of CO2 enter the water column and are spread all around the tank.
some say they are unsightly, I say they help me visually manage flow.
If I see microbubbles entering and leaving the plantbeds, then I know flow is good.
this has been extremely beneficial to me when managing dense plantings.

a couple feet back from the tank you cannot see the bubbles.
for closeup photos you can shut off the gas.
I'm a little confused about what you are trying to do? It seems that you are trying to make carbonated water!

What is controlling the final concentration of CO2 in your set up? Tom Barr recommends 30 ppm and I think 20 ppm is more than enough. What are you setting as your tank limit?

At 20 ppm I more than double the biomass of my plants in 6 mo.
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Old 08-05-2009, 03:56 PM   #9 (permalink)
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Default Re: Needle wheel pump

In my case there is no target or controller and I have only a needle valve to meter the gas after the regulator, but the needlewheel pump could be part of any controlled system that kicks gas on and off by a pH reading or something else. and it is a lot like carbonated water or more like a nice stout .

the bubbles are *tiny* when its going well, think of the little bubbles in guinness. After a pint is pulled notice the bubbles move downwards, swirl around - they follow flow readily and are less in a hurry to reach the surface. So CO2 is distributed all around the tank as a fine mist. I have no scientific reason why I've had so much success using needlewheels, but I like it very much.
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Old 08-05-2009, 04:05 PM   #10 (permalink)
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Default Re: Needle wheel pump

Quote:
Originally Posted by ashappard View Post
In my case there is no target or controller and I have only a needle valve to meter the gas after the regulator, but the needlewheel pump could be part of any controlled system that kicks gas on and off by a pH reading or something else. and it is a lot like carbonated water or more like a nice stout .

the bubbles are *tiny* when its going well, think of the little bubbles in guinness. After a pint is pulled notice the bubbles move downwards, swirl around - they follow flow readily and are less in a hurry to reach the surface. So CO2 is distributed all around the tank as a fine mist. I have no scientific reason why I've had so much success using needlewheels, but I like it very much.

Well put!

Thanks! Im thirsty now
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