Physical sweeping is the movement of cash from multiple bank accounts into a single concentration account. This is typically accomplished with a zero-balance account, from which a bank automatically sweeps all cash at the end of the day, and into a concentration account. If the zero-balance account has a debit balance at the time of the sweep, then the funds are shifted from the concentration account back into the account having the debit balance, until its balance is zero. Sweeping is used to consolidate cash for more efficient investment activities.
It is also possible to maintain a predetermined minimum balance in a subsidiary account, so that only cash levels above the designated level are swept into the concentration account.