What a Cubic Metre of Effluent Costs, and What Cutting One Saves

Split the flow by what it costs to treat, not by which department it came from — two streams with the same chemistry belong on one row and a rinse that needs no more than screening does not belong with a dyebath drop. The variable cost is only what the next cubic metre of that stream adds: chemicals, power, sludge handling. It is not the plant cost divided by the flow, and if you enter that number here the sheet has nothing left to tell you. The recoverable share is how much of that stream comes back as water the mill can use, which for a strong dyebath is honestly zero.