For anyone that has been making CS long enough to get interested, but not 
long enough to get board, I would recommend that you put a resistor in series 
with one of the electrodes and measure the voltage across it. Start with 1 
ma. - i.e., 27 volts = 27K resistor. It will give you a good idea of how 
clean your sanitation is (water, container, electrodes, etc.) Bonus! You can 
adjust the resistor value to control the time it takes to make stuff.  This 
will work with batteries, power supplies, so called "CS generators" DC or AC.

Agitation is good:
Air bubblers? - Do they introduce airborn crap?