That includes weekly cleaning, chemicals, flushing of filter when it needs it, topping off the pool, and my people clean the pool deck when it needs it.

Look at the topography and terrain to determine how.Evaluate fundamental infrastructure and service availability, as well as expose examples like wetlands and flood zones, protected lands, hazardous chemicals etc.

Everything I read online says DO NOT use exterior stain on the interior due to the fact it gives off harmful chemicals. 

You will get efficiencies of scale with chemicals and service calls.

Painting with Kiltz or Zinsser BIN will seal the smell, stain and chemicals for a while, but they may eventually come back.  

We washed the concrete with a garden hose and chemicals.

I joined bigger pockets a while back but had to focus on paying my way through school and passing a dual major in Chemical Engineering and Paper Science Engineering.

Currently my hot tub maintenance person says I need to schedule her to come out to the property after every turnover to poor chemicals in and clean the tub.

For instance, in regulating chemical companies to not pollute with new novel chemicals in our rivers and oceans, without needing a new law from Congress.

yes, some people (who run it as a full time business) do well, just as some people who run automotive manufactures, chemical plants, and construction companies do well.