Smoking in the presence of these chemicals when they are free in the atmosphere in an enclosed space can cause death by phosgene poisoning if the refrigerant is formulated with chlorine (R-12, R-22, etc.)

You can sand it or go "passive/chemical. 

I had another house with chemical drums in the backyard, got it real cheap.

I went back to school to become a chemical engineer and worked in that field for nearly 8 years.

And although this is going to sound harsher than I mean it to be.

My understanding is that the EPA is beginning to ratchet up additional testing for more chemicals and certain states, and that testing of these will initially be more expensive.  

I work full time in chemical sales as well as have a side business in which i have a crew who does repair work for utility companies.

Not only that there's lots of caustic and carcinogenic chemicals all thought them.

I can't control your believes or do I want to, but when you ask me the same question I am going to be a little bit harsher than she was.

They manage the cleaning/balancing of the hot tub (we supply chemicals).