Take context from the input text and decide on the accurate relationship between 'water treatment' and 'water' from the options provided.
Options: director/manager, currency, platform, product/material produced

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.
product/material produced