The manufacture of paper required numerous chemicals, which fire liberated and transformed into even more effective poisons.

Removing paint requires strong chemicals and in some cases a heat gun, which can cause a fire.

The carbon filter does not require chemicals.

The manufacture of paper usually requires inorganic chemicals and creates water effluents.

Taking their place are wildflower and wild grass "lawns," requiring little maintenance or chemicals.

Slow sand filters do not require chemicals or electricity to operate.

However, these companies were researching along photographic lines, and their solutions required special chemicals and papers.

Many people, myself included, believe that spending more on organic foods is worthwhile because they are healthier and they require fewer harmful chemicals to produce.

The resistant corn would require little or no chemicals.

ClO2 has to be generated on-site, requiring extra chemicals, more equipment, and operator training.