Since I live on a ranch with household water coming from a well and the drains all dumping into a septic, I know I'll need to address what to do with chemicals after they become depleted.

Source water will need to be produced or purchased distilled, this is easy to solve.

What is the best, least damaging, while affordable means for chemical disposal ?

I'm not looking forward to the kind of bill I'd get from hiring a chemical/hazmat waste company to send a truck 100+ miles for a few liters of spent E6 or B&W.

One thought was to get an open top 55 gallon drum where the chemicals could be dumped and allowed to desiccate. Once the drum is getting close to being full of chemical solids, then see about who could safely cart it off.

Has anyone played with Silver recovery and, for a small in home lab, does it pay ?