After reading this thread, I was inspired. We make Organic Soda and sell it. Forever are we having issues pumping out to the demand that we are getting. Without giving away any major secrets. This is our setup.
1. We boil down our ingredients. (Slurry)
2. The slurry is put into Keg A.
3. Because our water is not the best where we live we use bottled water, and highly filtered water in 5 gal. jugs, so we fill Keg B with the water.
4. We run the water through the Carbonation Machine at 10 psi CO2, Compressed Air, Beer Gas, it doesnt matter, as we are just delivering the water to the pump.
5. We run another line to the pump with CO2, we have experimented with Liquid CO2, it did not make a difference. Depending on the Soda we are making between 75 - 100 PSI.
6. From the "Out" of the pump the carbonated water to Keg A (it has the lid on it to help prevent CO2 from coming out of the liquid) with the slurry in the bottom, via the out post on Keg A. This helps 2 things, It helps mix the slurry and minimizes turbulence (if used the in post of Keg A, the water falls to the bottom).
7. Attach needle valve to the In post to bleed the excess pressure very slowly.
8. When fluid starts coming out, shut the valve disconnect.
9. Cool to 1˚C 5 - 6 Hours, sometimes with a 0.5 Micron stone
10. Bottle, we use a Beer Gun, Consumer Grade Counter Pressure Filler we find less effective. And hopefully we will purchase a industrial grade Dual Head Auto CP Filler.
We have played with filling sanitized kegs with water and bring the water to 1˚C then running it through the Carbonator.
As part of our quality assurance, we test each lot for Vol. Co2, and get consistent results of 2.5 - 4.1, again depending on what we are wanting.
In 1,600 or so batches in the last year and a half, we have found that Carb Stones are fantastic and more accurate than force carbing; by shaking etc. and use less co2, as you have more control. It makes sense, if you carb a keg for 7 hrs with a stone at 35 psi. You will have the same result almost everytime
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