I know of a guy that had problems with gophers in his yard. He decided that the He would use Carbide . He poured a can down the holes and added some water. Ok so now he threw a match awumpp no more gophers. What he did not expect was the carbide to continue to make the gas and much to his dismay a few days later when some one threw a match after lighting a cigarette The explosion blew his house off the foundation. Luckey for him no one was hurt.