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Old 09-22-2010, 04:22 PM   #1
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air stones

how often do you change air stones? i've got the longer 4-6" ones. just curious!

thanks!
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Old 09-22-2010, 04:40 PM   #2
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unless they become clogged up, then with occassional cleaning you probably shouldn't ever have to change them out.
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Old 09-22-2010, 05:35 PM   #3
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Also, airstones that are buried underneath the substrate tend to last quite a bit longer than those that are left open to the water column. The only downside is that the deeper you bury the airstone - the bigger the bubbles will be when they come up (moreso with gravel than sand).

Then again - bigger bubbles = greater surface disruption = better diffusion.
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Old 09-25-2010, 09:41 PM   #4
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The bubbles themselves will aerate and add oxygen. Smaller bubbles have more surface area and do this better, but larger bubbles create more flow. I usually change out air stones either when they break or when they are so worn that they are only putting out big bubbles from a few holes (as opposed to small bubbles from many holes).
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Old 09-25-2010, 10:00 PM   #5
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I've never used one... i would see no need to replace it unless its not working though
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Old 09-27-2010, 11:18 AM   #6
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Why would bubble size matter? The stone will pump out the same amount of air regardless of which size the bubbles end up by the time they surface.
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Old 09-27-2010, 02:12 PM   #7
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I had an airstone in a ten gallon and it rarely ever got clogged. If it did, I'd just replace it instead of cleaning. They are pretty cheap.
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Old 09-27-2010, 03:34 PM   #8
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Smaller bubbles have a lot more surface area per volume of air so you get more oxygen exchange by the time the bubbles hit the surface. Larger bubbles move more water though, so you are not going wrong either way.
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Old 09-27-2010, 04:10 PM   #9
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Oxygen exchange from the bubbles is almost nil regardless of bubble size.
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Old 09-27-2010, 04:22 PM   #10
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Not exactly. Oxygen will diffuse at any air-water surface. It does not know or care whether it is in a bubble or at the surface of a tank. Small bubbles have MANY times more surface area and therfore a lot more surface for oxygen to diffuse across.
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Old 09-28-2010, 10:05 AM   #11
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Quote:
Originally Posted by Fishguy2727 View Post
Not exactly. Oxygen will diffuse at any air-water surface. It does not know or care whether it is in a bubble or at the surface of a tank. Small bubbles have MANY times more surface area and therfore a lot more surface for oxygen to diffuse across.
While that's true the difference in surface area between small bubbles and large bubbles will be insignificant when compared to the water surface.
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Old 09-28-2010, 10:22 PM   #12
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I don't think so. The surface area of large bubbles will add up to a lot, and small bubbles will have many times as much surface area. Even if there is more surface area at the top of the tank the bubbles are passing through the water column very quickly, creating a lot more interaction between bubbles and water that can be oxygenated.

In my opinion the interaction between bubbles and the water column create more oxygenation than the flow of water across the surface of the tank created by the bubbles.
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