Every time a faucet is turned off a few drops
of water are trapped inside the aerator (or
laminar device) where they stagnate, warm up
and eventually evaporate, leaving a film of
scale, source of food for biofilm. While
insignificant in a residential or commercial
environment, such areas where bacteria could
possibly thrive and multiply due to biofilm are
a concern in healthcare facilities (hospitals,
senior care, medical labs).