Greywater Reuse
Greywater refers to the wastewater generated from homes or other building except for the wastewater from toilets. This includes shower water, sinks, dishwashers, laundry wastewater etc. This will be relatively clean and has less pathogens compared to blackwater(the sewage water from toilets) and can be reused after treating. Greywater reuse without treatment can also be done within houses, like using the greywater from showers or bathtubs for toilet flushing, and the water from vegetable washing for garden.
...Rainwater Harvesting Regulations in Bangalore
It is compulsory to have a rainwater harvesting system for all buildings measuring 1200 square feet and above. For earlier building built before 2009, it is compulsory if the area is above 2400 sq. feet. It could be either a storage system for re-use or used for groundwater recharge.
...