English to Italian Tech/Engineering Engineering (general)

Non capisco chi siano i soggetti di "observing" e "activating", e quindi non saprei come rendere questi verbi.

"The present inventors have recognised that some pool failures occur due to ill-informed pool attendants observing that the pool water level has risen (or perhaps even that the pool is overflowing) during or shortly after heavy rainfall, and in response thereto activating the pool pump to drive water out of the pool via the back
wash line."



Grazie!