No toxic chemicals could be used, since they would quickly impact health.

"And we didn't want any toxic chemicals inside the building, but that was about it."

"I hope that we would never need to put a toxic chemical on a golf course."

Well, at least one town, where toxic chemicals are in the water supply.

What is this, and how can I treat it without toxic chemicals?

I could think of no reason for it, except perhaps that toxic chemicals were responsible.

Is there any way to prevent it, short of toxic chemicals?

Test results show that some very toxic chemicals have in the past been put into the shaft.

Or they want to know if we are using toxic chemicals.

It limits the amount of toxic chemicals that are given off.