Custom dry cell with a custom made internal manifold system. 2 plate gaps, 6VDC, with 3 teaspoons of potassium carbonate as electrolyte. Run time was one hour. Based on bubble size, and speed from other you tube videos Ive seen, Im estimating at close to 1 LPM with 2 plate gaps. Next run will be with a larger array to create more gas with less input voltage. Future prototypes will omit the use of nickel as an electrode.