On 20 July 2017, we (Alana H. and Uma) visited the site of a grey water treatment system in HSR Sector 5 near Agara Lake in Bangalore. The family of four consumes only about 12 KL of water per month. This water is provided by a combination of Kaveri water, a borewell, stored rainwater, and grey water. They save about 300 litres of water each day by treating and reusing grey water for gardening.
GWT System Details
The system at Mahalakshmi’s home was installed in 2011 and currently treats about 300 litres of water. At the time of installation, the system cost approximately Rs 80,000 to install, including civil work. Because the system was installed when the house was built, the family is not able to convey any ‘savings’ as such. But they spend very little on water compared to other people.
The GWT system currently treats water from the washing machine and bathrooms. The family uses organic/mild detergents and soaps including Amway products, Genteel, and handmade bath soaps which are easier on the GWT system.
The GWT system currently treats water from the washing machine and bathrooms. The family uses organic/mild detergents and soaps including Amway products, Genteel, and handmade bath soaps which are easier on the GWT system.
The system consists of the following components:
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Component
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Dimensions
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Notes
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Baffle Tank
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2’ x 2’ x 2’ with 2 baffles
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Reed Bed
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22.5’ x 2’ x 3’ with 18” of gravel
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Polishing Pond
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3’ dia. x 13’ depth
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Aside from the reeds dying when the system dries out, they have not experienced any other problems.
The treated water was tested and gave the following results:
TDS: 792 ppm
pH: 8.2
H2S: No coliform bacteria
![IMG_20170723_152618460_HDR[6584] - Mahalakshmi.jpg](https://lh4.googleusercontent.com/UtdI3OpDdjLzw-TQeMWp74X2SWtyK7Fh0Gl8lpkbRsv7-_ejnNR4m_hG0LOaUkzvUa8PvGYoVRNJVbg2QWqkg27K9s9SYJruZxokfUcHPdpZ0O-jbUDZ2RovEV5N_qQF8AHRHxX8)
Water Use Breakdown
The family of four uses about 12 KL of water each month. The breakdown of each water source can be seen in the table below.
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Water Source
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Kaveri Connection
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Borewell
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Rainwater
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Grey Water
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