They've been known to cause chemical health issues.

In the late 1950's, rolled VINYL (made, I think, from petro-chemicals) became available (at least in no-wax surfaces).

I add a chemical designed for cleaning steam boilers to the water before starting the system.

I currently work as an engineer in the chemical industry (~7-5 salaried job).  

What ever you choose to go to collage  for do it for the money even of you  don't like it  that's why we have hobbies  chemical  engineering is not a bad option good money and easy to land a job good luck

Or, do you try those chemical solvents that you lay on the caulk?

@Al Williamson A chemical, composting or incinerating toilette would be less hassle, though it would probably take more time to train the tenants.A macerating toilet is definitely not tenant proof.

I will use mold remediation chemicals and paint throughout.  

I mentioned that to see if they were open to it, and her response was "that's a harsh chemical".

I have been a volunteer fireman for over 30 years and take fire safety seriously, but only after going to a class on STR safety did I realize that I leave lots of cleaning chemicals where young children could get to them.