THEORY OF OPERATION-CONTINUED
Water Reuse System
The CBL utilizes a water reuse system that filters wash water from the washers and stores it in a reuse
tank for use in subsequent wash loads. Wash water from the washer is discharged from a reuse drain into
the Water Treatment System (WTS) transfer tank (Figure 4, Item 1) located behind the washers. When
the WTS transfer tank is full, the untreated wash water is pumped up to a WTS holding tank (Figure 4,
Item 2) located over the washers. Pump P3 (Figure 5, Item 3) takes water from the WTS hold tank and
sends it through the F-1 (Figure 5, Item 4) and F-2 (Figure 5, Item 5) filters to remove gross impurities.
Water is then routed to the nanofiltration feed tank (Figure 5, Item 6) for collection. Water from the
nanofilter feed tank is fed into Pump P-4 (Figure 5, Item 7) and through a series of three nanofiltration
vessels (Figure 5, Item 8) that remove all remaining impurities and bacteriological products. Water then
passes through carbon filter F-3 (Figure 5, Item 9) and is stored in the reuse tank (Figure 5, Item 10) for
Two additional modes of operation are available:
In Minimum Reuse mode, wash water from the washers is diverted directly to the reuse tank, bypassing
the filtration system. Minimum reuse requires the operation of valves V-15 and V-16 in order to be
The minimum reuse mode is not recommended unless the filtration system is inoperable and water
conservation is critical.
The water reuse system may be bypassed entirely by simply selecting the appropriate cycles on the
washers. All water is then discharged directly to the waste tank and pumped out as graywater. No reuse
is recommended if the filtration system is inoperable.
Figure 4. Water Reuse System.