Neptune Systems DOS Dual Reservoir Setup Manual page 5

While the field names might vary, the purpose is the same – indicate the total volume of
each container and the amount of fluid currently in them.
The capacity of each DDR container is 2 Liters or 2,000 ml. By entering values here (1
– 150,000), Fusion will automatically keep track of your container volume and display
that on a graphical tile on the Fusion dashboard. Note that you can use this for a
container up to 150,000ml (approximately 40 gallons). This supplements the purpose of
the optical level sensors in the DDR which are positioned in the reservoir to notify you
when approximately 500ml of solution remains. These fields when properly completed
will enable Fusion to give you additional information about fluid levels in the containers.
Note that if you have a DŌS but not the DDR you still can use this feature with
your own reservoir, just substitute your values for those noted above. However
the depiction of the containers in Fusion is only available with the DDR.
DŌS Dual Reservoir - Setup Guide Page 5