Water cooling systems are not so closed.
"Microsoft and Nvidia market sealed liquid loops as a near-zero-water alternative to evaporative cooling... Microsoft describes cooling systems that are filled once during construction and then recirculate the same water, while Nvidia's Rubin platform runs a coolant that is 75% water and 25% propylene glycol. That one-time fill, however, is the step that produces a discharge, and the flush water leaves the site before the loop is sealed"
Gerry McGovern@gerrymcgovern@mastodon.greenMeta data center water discharges suspended after contaminating the city's reclamation water supply with bacterium — system offline for months for cleaning, closed-loop cooling system purge spread rare metal-resistant bacteria in Cheyenne’s water system
These closed-loop systems are the answer to everything