How deep is the water seal in the water closet?

The house sewer should always be ___

_______ is generally used in food processing units.

How much is the water seal in intercepting trap?

________ should not be placed near water body.

______ is provided on the floor to collect wastewater from various sources like sinks.

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

How many traps are present based on the shape?