Max,
   
  PAGE 23 of my book on making silver solutions has a data plot the shows what 
happens when a constant current system is left un-attended.
   
  Current limiting is based on the area for the positive anode only. You cannot 
use 1 ma diodes for everything. If your anode has 12 sq in of wet area then you 
need to limit at 12 ma.
   
  Current limiting is NOT the panacea for all ills. You still have to monitor 
the voltage or conductance to see when agglomeration is setting in !!!!!!
   
  "Ole Bob"