If you do decide to build it use only 7 plates instead of the 8 that the plans call for,it has better production with 7.
http://www.umpquaenergy.com/hydrogen.../tero_cell.pdf
I installed a 1/4"x3/8" nylon barb fitting on the end plate even with the bottom of the plates just above the spacer gasket.That's connected to a resevoir tank with the full mark on the tank is at the level I want the electrolyte in the cell,which just below the gas outlet fitting about 1/2".Just keep the tank topped off and gravity does the rest.
The specs on the tero cell are almost 2 lpm drawing 22 amps if you build it to plan specs.The electrolyte Is a strong concentration of potassium hydroxide(koh) 28% by weight which works out to about 1 lb of koh to 1/2 gal of distilled water,I wouldn't run sodium hydroxide(NaOH) because it tends to gum up this type cell. I know thats sounds high that's what the design calls for.I've been running a little more than that in my cell(built mine twice the size called for in the plans) for over a year and production is great.Even with a high concentration of koh this cell will barely get warm to the touch,one of the benifits of a true series cell design.
Regarding the outlet holes I drilled mine 1/2" and it works fine.The equalization holes I drilled 1/8"
Nfryan Did you read over the tero plans I posted? Under electrolyser tips #8 is the koh to distilled water ratio,and yes that's correct.
Sorry I don't have any pics to post at the present time to post,but I built my cell twice the size than the plans I posted.If you want more lpm per the amps if you decide to build one,I would build 2 stock ones and run them in series because it would be more efficient than a larger one.At the time I built mine I was still pretty green on hho cell designs,and wish I knew then what I know now.If I decide to build another I'll build 2 stock ones and run them in series.