Pig farmers report black foam rising from under floors

North American pig farmers have reported several occurrences in the past year of large volumes of black foam rising from under slatted floors which can produce hazardous gases.

As the gases are released and become trapped by foam at the surface, the foam builds up.

When the foam is disturbed by pig activity, power washing, water sprinklers or agitation, it releases methane and hydrogen sulphide gas.