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I ran this for many years with great success using yeast bottles.
Had eheim under the tank providing some filtration. Undersized and packed with peat. I used the return line from the ehiem to run the diffuser.
Diffuser is so: Clear plastic squeaky clean bottle, swedged onto the return flow. Situates vertically in the tank, almost reaching the bottom of my tank.
Cut three or four cuts half way through bottle at bottom side for water to flow from bottom, towards front of tank. I used table saw to have proper width slots, horozontal on the bottle. You could cut and file to create grill effect.
Pack two or three plastic sink scrubbers in through new cuts, or fill with bio balls, then pop slots back to shape.
Drill and glue an airline coupler through the back wall, low, but just above slots, and stick on a plastic micro bubble diffuser, inside bottle. This would be just below the plastic media. Route your co2 line down along the back of the diffuser next to affixed suction cups. I think I used zip ties.
Plumb it in and hook up the gas, and stick it to the glass.
The water flow is down, through current disturbing media, through rising microbubbles of gas. Any excess gas collects in the top of the bottle, and the water flowing through it, on the media gives large surface area.
No gas is allowed to be wasted, and you have a visual (until algae covers bottle) on how your beer is brewing.
I don't have this rig now, as all filters are internal, but a powerhead (small) could also power this. You could use sponge on the intake, and discharge through the diffuser. Sponge and bottle, if the same diameter and length, could mount side by side, and look quite unobtrusive.
Happy fishing
Had eheim under the tank providing some filtration. Undersized and packed with peat. I used the return line from the ehiem to run the diffuser.
Diffuser is so: Clear plastic squeaky clean bottle, swedged onto the return flow. Situates vertically in the tank, almost reaching the bottom of my tank.
Cut three or four cuts half way through bottle at bottom side for water to flow from bottom, towards front of tank. I used table saw to have proper width slots, horozontal on the bottle. You could cut and file to create grill effect.
Pack two or three plastic sink scrubbers in through new cuts, or fill with bio balls, then pop slots back to shape.
Drill and glue an airline coupler through the back wall, low, but just above slots, and stick on a plastic micro bubble diffuser, inside bottle. This would be just below the plastic media. Route your co2 line down along the back of the diffuser next to affixed suction cups. I think I used zip ties.
Plumb it in and hook up the gas, and stick it to the glass.
The water flow is down, through current disturbing media, through rising microbubbles of gas. Any excess gas collects in the top of the bottle, and the water flowing through it, on the media gives large surface area.
No gas is allowed to be wasted, and you have a visual (until algae covers bottle) on how your beer is brewing.
I don't have this rig now, as all filters are internal, but a powerhead (small) could also power this. You could use sponge on the intake, and discharge through the diffuser. Sponge and bottle, if the same diameter and length, could mount side by side, and look quite unobtrusive.
Happy fishing
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