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post #1 of 4 Old 03-08-2013, 04:16 PM Thread Starter
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DIY Moving Media Filter

I have been looking around for added biological filtration techniques for my 29gal tank, when I came across a DIY moving media filter using a water bottle, airline, and cut straws. Is this technique one to consider? Or is it just a farce?

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post #2 of 4 Old 03-08-2013, 06:09 PM
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The idea behind biological filtration is to give the beneficial bacteria maximum surface area to reside on in a minimum volumetric space (for an in tank or HOB filter) with good water flow through the entire media with as little bypass flow as possible. Moving the media is of no value other than to take up more space to allow it to move.

Oh, and it gives you something to look at if you get bored with the fish, I suppose.

There is more surface area on a course sponge than on pieces of straws and it adds a mechanical filtration factor to boot. A small sponge filter is probably the most efficient use of space, mechanical filtration and biological filtration.

If you are keeping an aquarium with plants, you don't really want a bubbler anyway.

BTW, welcome to the board.

Jeff.


Total years fish keeping experience: 7 months, can't start counting in years for a while yet.

The shotgun approach to a planted tank with an LED fixture

Small scale nitrogen cycle with a jar, water and fish food; no substrate, filter etc

Last edited by JDM; 03-08-2013 at 06:13 PM.
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post #3 of 4 Old 03-08-2013, 07:58 PM
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Quote:
Originally Posted by JDM View Post
The idea behind biological filtration is to give the beneficial bacteria maximum surface area to reside on in a minimum volumetric space (for an in tank or HOB filter) with good water flow through the entire media with as little bypass flow as possible. Moving the media is of no value other than to take up more space to allow it to move.

Oh, and it gives you something to look at if you get bored with the fish, I suppose.

There is more surface area on a course sponge than on pieces of straws and it adds a mechanical filtration factor to boot. A small sponge filter is probably the most efficient use of space, mechanical filtration and biological filtration.

If you are keeping an aquarium with plants, you don't really want a bubbler anyway.

BTW, welcome to the board.

Jeff.
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post #4 of 4 Old 03-09-2013, 10:16 AM
Welcome to TFK!

The fluidized bed concept/method/idea has been around for some time. Proponents argue that the moving media somehow makes it more efficient.

Personally I just don't see the logic. Biological filtration works best when water flows slowly around/through a 'platform' that allows the bacteria to attach to it. I don't think moving media does much at all. Also, I think open cell foam and conventional bio-media offers a much better platform for BB than cut straws.

I use an Aquaclear 70 filter with an AC30 impeller for reduced flow, completely filled with a mix of Seachem Matrix and De*Nitrate bio-media, as a dedicated bio-filter.
I handle mechanical filtration separately.

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