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.

Water Health centres are community based water treatment plants with ultra-violet and reverse osmosis systems for purifying water.

Answer: product_or_material_produced