http://www.aquaessentials.co.uk/index.php?main_page=product_info&products_id=1367
Anyone use these?
Just wondering if they are better than normal airstone:dk:
Ceramic Airstones
- Thread starter Doodles
- Start date
http://www.aquaessentials.co.uk/index.php?main_page=product_info&products_id=1367
Anyone use these?
Just wondering if they are better than normal airstone:dk:
Again Eheim make an air stone its very good lasts for ever,
You just replace a small pad inside the air stone.
Cheap and very good
http://www.aquaristikshop.com/cgi-bin/neu/webshop.pl?f=*NR&c=4002650&t=temartic_e&userid=WSuT4BxqP05z1hRuj8moUt2fKSAD3GjP4bb
You just replace a small pad inside the air stone.
Cheap and very good
http://www.aquaristikshop.com/cgi-bin/neu/webshop.pl?f=*NR&c=4002650&t=temartic_e&userid=WSuT4BxqP05z1hRuj8moUt2fKSAD3GjP4bb
They look pretty cool. I like that aquaristik shop, have used them a few times:yes:
For a few things they are very cheap a few years ago I used them all the time due to the Euro being low.
For Eheim stuff John Allen are about the best bet .
They have most items in stock and don't seem to get confused at being asked for "the little bit on the end of the bendy bit"
Regards Bob
Hi all,
Depends what you want the air stone to do. For any stone/pump the balance is between the amount of surface movement it creates and the bubble size.
I think the advantage of these is that they produce very fine bubbles, as long as you have a "chunky" enough air pump. Within reason the finer the bubbles from a ceramic air-stone the better it works.
The "best" diffusers are actually the “EPDM (ethylene propylene diene terpolymer) membrane diffuser type", partially because they will work efficiently across a range of air pressures.
I wrote an article (for PF) "on aeration and dissolved oxygen in the aquarium", as I got quite a good overview of both biological filtration and oxygenation when we used to work with the landfill leachate in the lab. I'm not quite sure what happened to the article, but here is the relevant bit for air stones:
".....In diffusion aeration the air is supplied by an air pump, and introduced into the aquarium through a diffuser. In this case as well as diffusion from the bubbles, when the air bubbles hit the water surface turbulence occurs, again increasing the diffusion of oxygen into the water at the water surface.
The more water flow and/or bubbles there are, the more surface turbulence there is. The bubble size is also important, in that the smaller the bubble the greater its relative surface area is, and the more diffusion of gas into the water will occur. What you do have to remember is that air is only 21% oxygen, and oxygen is much less soluble in water than, for example CO2. This means that an air pump needs to produce very fine bubbles (in the range of 10 – 200 microns diameter), that have a long “residence time†in the water column, if significant exchange of oxygen to the water is to occur. For maximum residence time and effect, unless you have a “wet and dry†or bio-wheel filter it would be advantageous if the filter intake picks up both the bubbles and oxygenated water, and feeds them straight into the filter where they will provide much needed oxygen to the nitrification process.
Diffusers and bubbles
Ceramic flat plate diffusers are one possibility for producing fine bubbles, and they are widely used in aquaculture, they have the disadvantages of being expensive, requiring high air pressure and clogging relatively easily. The other option is a membrane diffuser, which has the advantages of not clogging so easily and requiring lower air pressure. The technical term to look for is “EPDM“ (ethylene propylene diene terpolymer), and the membrane diffuser can be in the form of a disc, tube or “air wallâ€. These kinds of diffuser are widely used in the waste water industry, and in aquaculture, where the BOD of the water may be several hundred times the waters natural oxygen holding capacity......"
cheers Darrel
Depends what you want the air stone to do. For any stone/pump the balance is between the amount of surface movement it creates and the bubble size.
I think the advantage of these is that they produce very fine bubbles, as long as you have a "chunky" enough air pump. Within reason the finer the bubbles from a ceramic air-stone the better it works.
The "best" diffusers are actually the “EPDM (ethylene propylene diene terpolymer) membrane diffuser type", partially because they will work efficiently across a range of air pressures.
I wrote an article (for PF) "on aeration and dissolved oxygen in the aquarium", as I got quite a good overview of both biological filtration and oxygenation when we used to work with the landfill leachate in the lab. I'm not quite sure what happened to the article, but here is the relevant bit for air stones:
".....In diffusion aeration the air is supplied by an air pump, and introduced into the aquarium through a diffuser. In this case as well as diffusion from the bubbles, when the air bubbles hit the water surface turbulence occurs, again increasing the diffusion of oxygen into the water at the water surface.
The more water flow and/or bubbles there are, the more surface turbulence there is. The bubble size is also important, in that the smaller the bubble the greater its relative surface area is, and the more diffusion of gas into the water will occur. What you do have to remember is that air is only 21% oxygen, and oxygen is much less soluble in water than, for example CO2. This means that an air pump needs to produce very fine bubbles (in the range of 10 – 200 microns diameter), that have a long “residence time†in the water column, if significant exchange of oxygen to the water is to occur. For maximum residence time and effect, unless you have a “wet and dry†or bio-wheel filter it would be advantageous if the filter intake picks up both the bubbles and oxygenated water, and feeds them straight into the filter where they will provide much needed oxygen to the nitrification process.
Diffusers and bubbles
Ceramic flat plate diffusers are one possibility for producing fine bubbles, and they are widely used in aquaculture, they have the disadvantages of being expensive, requiring high air pressure and clogging relatively easily. The other option is a membrane diffuser, which has the advantages of not clogging so easily and requiring lower air pressure. The technical term to look for is “EPDM“ (ethylene propylene diene terpolymer), and the membrane diffuser can be in the form of a disc, tube or “air wallâ€. These kinds of diffuser are widely used in the waste water industry, and in aquaculture, where the BOD of the water may be several hundred times the waters natural oxygen holding capacity......"
cheers Darrel