zhi wrote:I am also still in the process of figuring out and tinkering. I am using the D301 model from banggood.
1st attempt... baking soda 200 gm+water 200ml & citric acid 200 gm plus 400ml. Somehow all citric acid in flowed into soda bottle. and psi reached 80 and it freaked me out. I think it was due to the vibrational pressure put on the co2 pipe by the air pump.
2nd attempt soda 100gm plus 200ml water and citric acid 100gm plus 200ml water. worked fine for a 1 week den suddenly i come back home and saw that again all citric acid flowed into baking soda but psi was normal and still the setup worked fine for 3 weeks at 1 bubble per 5~7 seconds at 20psi.
3rd attempt- same setup as 2nd.... working fine so far... i think it has found its equilibrium. CO2 flow is constant.
I am not sure if the citric acid pipe dipping into the baking soda pipe would cause any back flow since pressure reduces in the baking soda bottle as co2 flows into the tank and as citric acid bottle has higher pressure it pushes citric acid into baking soda bottle. But initially i think it's the air plus co2 that can be seen to be flowing back into the citric acid bottle.
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