What is the ratio of cement to be used to plaster the drain at the bottom of the camber?

What is the minimum depth of water seal in floor trap?

What is the odour threshold limit of H2S gas?

What is the chemical used to prevent H2S gas formation from Ferric chloride?

Which of the following runoff formula is correct w.r.t. Kuitchling formula?

H2S gas is denser than air.

The entire system should be ventilation free.

The rate of release of H2S is high at the points of __