How do we count the alum, PAC and polyelectrolyte our water plant buys?
Coagulants and flocculants you buy are Scope 3 Category 1. Use kilograms bought from invoices and a supplier or named database factor for each. They are often small next to the plant's electricity, but auditors still expect them listed or a reason for leaving them out.
List
- Alum and poly aluminium chloride (PAC).
- Polyelectrolyte.
- Hypochlorite, lime and acid for pH.
Leaving them out
If they are below your exclusion threshold, say so and show the estimate behind that decision.
What Senseible does here
Senseible reads bills, fuel invoices and production records into dated, fingerprinted records, so the figure you send a buyer can be traced to its documents.
Sources: GHG Protocol Corporate Value Chain (Scope 3) Standard, GHG Protocol Corporate Standard
Last reviewed 2026-10-22.