Household appliances are getting more and more efficient at conserving water, and advertising claims that this helps conserve the environment.
Some time ago, I've seen a documentary about a German waste water treatment plant where the incoming water was slightly chlorinated and irradiated with UV lights to kill off bacteria, and fresh water subsequently added.
A spokesperson from the processing plant explained that these two steps have been added recently, as the public's conservation efforts have led to a reduced flow rate in the waste water system, allowing undesired bacteria to replicate more, and to an increased concentration of detergents, to the point where the bacteria used in the cleanup process would no longer be able to function.
This suggests to me that in a closed cycle, it would be better to "use" more water in order to keep the system within the flow rate it was designed for, rather than add the additional fresh water at the end of the cycle.
Is that correct?