Based on ISO 11127-6 for testing the overall level of water-soluble contaminants in blasting abrasives. Based on ISO8502-6 Extraction of soluble salts for analysis – Bresle method) and ISO8502-9 (Field test method for conductivity of soluble salts), measurements using the Bresle method to extract water-soluble contaminants from the surface of a substrate and using an electrical conductivity meter.