When a solution of potassium thiocyanate was added to 100 ml of artesian water, the water sample turned bright red.

When a solution of potassium thiocyanate was added to 100 ml of artesian water, the water sample turned bright red. what conclusion can be drawn from the observed effect?

One of the qualitative reactions to ferric cations Fe (3+) in solution is a double substitution reaction with iron chloride and potassium thiocyanate. Molecular reaction:
FeCl3 + 6KCNS = K3 [Fe (CNS) 6] + 3KCl
The salt K3 [Fe (CNS) 6] – potassium hexacyanoferrate (III) formed has a distinctive bright red color.
The acquisition of color may indicate that the artesian water contains a dissolved salt of iron (III) chloride, that is, it is necessary to purify the water.