> Potassium Hydroxide spillage suggests it's a CO2 scrubber. The text says it produces O2 by splitting water, so I think it is an electrolysis thingy. NaOH is IIRC the most convenient solution to electrolyse for O2 production. Wouter van Ooijen -- ------------------------------------------- Van Ooijen Technische Informatica: www.voti.nl consultancy, development, PICmicro products docent Hogeschool van Utrecht: www.voti.nl/hvu -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist