Refer to the input text as context and select the correct relationship between 'water treatment' and 'water' from the available options.
Options: platform, business division, operator, product/material produced

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.
product/material produced