Homebrew PCBs

I search messages arhive on this subject and no concludent result. 
Opinions are very diferent: 1mm holes at 2,5 mm space-large bubbles or 
aquarium tipe aerator whith millions of little bubles.

I have a 200x200x30mm etching tank and I use FeCl. I made a heater 
from a 4mm PVC hose aranged on entire surface of tank. Something like 
this
 __________
 __________|
|__________ 
 __________|
|__________

The hose is conected to my sower hose, so the temperature is fully 
ajustable. A simple and safe device...
I allso have a very powerfull air pump so I can generate a lot of air.


Adrian