So I set out to build a Co2 fertilization system to improve plant health and growth in my tank and thus overall health. And so far, so good actually. I have drilled out the caps of the 2 litre bottles and installed and sealed the piping onto the bottle caps for the producers and the separators. The use of separators means that you can use standard airline because any bubbles from the yeast solution that are highly acidic are separated out in the second bottle. I will explain this more on my instructions on how to build the DIY yeast Co2 system. No all that is left to do is drill a hole in the cabinet beneath to run the line through, connect the pipes and mix up the yeast. Hopefully all goes well. 
cool
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