_______ indicates the freshness of grey water.

Related Questions

• The rate of amount of water vapour present to the amount it would have contained, had it been saturated, is known as the ___________
• What is called for the method of removing dust and other particles from water using filters?
• In urban cities like Bangalore, which of the water carriage system is used?
• The direction of water in filter beds is reversed for ______
• Rapid filtration is used as the _______ clarifying step in municipal water treatment plants.
• Water proofing treatment is one type of