[praveentnair]

I use a water forced mechanism to dissolve the bubbles. for this you need to get an internal filter as small as possible. The tube needs to be put close to the impeller so that the bubbles gets trapped in the impeller and broken into smaller bubbles. The outlet of the pump is then connected to a bottle with open bottom. The bottle should be kept vertical so that the water flows downwards. The bubbles coming out of the motor will be then forced to go down and eventually will be dissolved completely. I have got this working with 100%. I will try to upload a diagram, but below given is the video at

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[praveentnair]

how big is your aquarium? the filter i am talking about is not the filter you use for water filtration. you have to get a new one, if you don't have one. It may cost $10 or so.

 

[praveentnair]

ok, for that the water forced method may not be suitable. Though some bubbles escape, the glass diffuser would work just fine. Do you have much water movement in the surface. I guess, if you have lot of water movement in the surface, there are chances that CO2 would escape ever after it is dissolved.

 

[praveentnair]

Did you get this going? I am sorry for the delay. But was busy with some office work.