(AP) — A Nebraska man created a dangerous gas inside his home this weekend by mixing two drain cleaners to clear a toilet.

The homeowner was fortunate he wasn’t seriously injured by the chemical cloud.

The homeowner suffered respiratory problems but refused to be treated at a hospital.

Firefighters wore breathing masks to enter the home, but they had to call in a plumber to help clear the blockage in the toilet before the gas dissipated.

Officials say it’s important that homeowners read the labels of the chemicals they’re using.