“Purified” is a bit of a general term, so let me break apart the potential issues:
- Distilled water shouldn’t be a problem.
- Reverse osmosis filtered water may or may not be a problem depending on the water source. Some dissolved minerals could conceivably get through, and minerals are generally going to be ionic.
- Ionic contamination along with moisture and current can lead to dendritic growth. DI rinse at the end of the cleaning cycle could reduce this risk.
- Contamination could lead to increased foaming.