hard water
preferred label: آب سخت @fa
type: Concept
related: soft water

salts
preferred label: نمکها @fa
type: Concept
related: soft water

soft water
related: hard water
related: salts
broader: water
preferred label: آب نرم @fa
type: Concept

water
preferred label: آب @fa
type: Concept
narrower: soft water