Self-replenishing alternative to Ferric Chloride for etching PCB's

As long as what to bring in you take out, hazardous waste (as defined by city, county, state, federal) and it’s disposal shouldn’t be a problem. What you do in the privacy of your home … well, it’s private. But pouring anything on their lists can’t be dumped down any of DMS drains. This is one of those nasty strict laws that can have serious problems for the Space.

What may be benign at the start, after the chemical reactions, may not be. I’m love to do anodizing - same issues. At least we will at some point have chem hood installed so the hazardous vapor issue is mitigated.