These numbers allow a relative comparison to be made (between facilities) across the composting process,
as the actual number of days for completion varied between the full- (90 to 365 days) and pilot- (45 days) scale systems, but not within.
In figures, the individual compost runs are identified by small letter subscripts to the material age.
An example of a full sample identification code could be: P/MSW0//1a.
This would indicate pilot-scale, actual MSW not N amended, immature material, run a.