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.

United Utilities (LSE: UU.L - news ) said on Friday that it is continuing to advise customers in Lancashire to boil their water before use after a routine test at Franklaw water treatment works in Preston (OTC BB: PSNP - news ) found small traces of a microscopic bug in the water.

Answer: product_or_material_produced