It could be static electricity, though I have never heard of a static discharge from water- especially that strong! It is actually non-conducting liquids that build up a charge. It's a problem in the oil industry, if you don't ground the containers when you are loading the liquids you can get a spark and then you have a real problem.
RO/DI water has all the ions (dissolved salts) removed so it is almost completely non-conductive (as someone mentioned earlier).
|