i bought some in a liquid form from a hydroponic shop for us$15/litre, 48% pure, used for raising pH levels, but seemed less stable in my electrolyzer than H2SO4, ie at 5v 20A, H2SO4 burns fine when bleeding thru a 1/8"OD and approx 1mm ID copper tube mounted on a needle valve, (but gets warm, then hot - thermal runaway), but the KOH (which ran cold) exploded twice within my stainless steel housing of my kettle, the first time taking out the pressure gauge and needle valve, the second blowing out the seal at the bottom of my kettle ... if i was using the old plastic housing as pictured on my project page i would still be picking up the plastic pieces ... the spiral elements, suffered no damage what so ever
George Wiseman (
www.eagle-research.com) in his HyZor book comments both H2SO4 and KOH require twice the cell voltage compared to NaOH (drain cleaner) to dissociate water