HANDLING OF SOLUTIONS

Described herein is an arrangement which allows solution to be supplied to a process from a `bag-in-box` arrangement, used solution being returned to an emptied `bag-in-box` arrangement for disposal. The arrangement includes a process (40) having an inlet (46) and an outlet (48) which is connected to a valve arrangement (10) by way of the inlet (46) and outlet (48). Respective `bag-in-box` arrangements (62, 64) are connected to the valve arrangement (10) which determines whether the `bag-in-box` arrangement is connected to the inlet (46) or the outlet (48) by its position. The arrangement provides a system in which new `bag-in-box` arrangements containing fresh solution for the process (40) are connected to inlet (46) thereof regardless of their relative positioning. Using the valve arrangement (10), the number of connections and disconnections for the `bag-in-box` arrangements is halved.