What is the ruling when a vessel is contaminated by multiple impurities of equal legal standing?

Chapter on what purification is achieved with regarding water

Al-Mughni

Book of Purification

Book 2 · Issue 1 · Bab 2

Open in Qurani

Primary text

When a place or vessel is afflicted by multiple impurities that are legally equivalent, they are treated as a single impurity. The purification requirement is based upon the nature of the lowest common denominator among these impurities.