Utilize the input text as a context reference, choose the right relationship between water treatment and water from the options. Options: product/material produced, manufacturer, distributed by, industry, position held, original broadcaster, owned by, founded by, distribution format, headquarters location, stock exchange, currency, parent organization, chief executive officer, director/manager, owner of, operator, member of, employer, chairperson, platform, subsidiary, legal form, publisher, developer, brand, business division, location of formation, creator.

It boasts of a sewage treatment plant of 600 KLD, which is based on environment-friendly extended aeration technology, water treatment plant, rain water harvesting and re-use of treated water for flushing and gardening.

Answer: product_or_material_produced