If the home is cleaned spotless to the point we can smell chemicals right before we get there that is a red flag as well. 

I do make weekly trips to water new trees over the summer.I provide filters for tenants and personally spray once or twice a year and write off the chemicals.  

Huge amount of capital being spent by big players in the Chemical industry (Big Oil & Gas) in Places like Baytown and on the East side of town.

Unfortunately that’s all dependent on your specific market and the type of hot tub you have and if the cleaner will be financing the chemicals.

The subterranean ones are treated with plastic pots of chemical that they will put in the ground around the house and spray the surface.

You treat them with chemical pots in the ground for the longterm.

You can get a mold treatment chemical or mix bleach and water and spray it onto the infected area.

The problem is the chemicals in the pool, react with the sealant, and instead of having a really nice rock layout where you see color running through the veins in the rock kind of thing, you see a washed out surface because the chemicals from the pool really interact with the sealant.  

Why I'm looking for this specific building type and location is that my other company manufactures construction chemicals and products, with an emphasis on masonry restoration and adaptive reuse of buildings, based in Lawrence KS.

If there was any prior use that could have caused environmental damage (leaking chemicals, buried wastes, etc,) you might want to have it checked out.