Index: Ringtoets/Piping/src/Ringtoets.Piping.Primitives/PipingSoilLayer.cs
===================================================================
diff -u -r686466dda6406ee2c7fb1f33faa60494878b1fc8 -rd67d84b0725d8e7192f1b8e2649eab0a5b1dcb69
--- Ringtoets/Piping/src/Ringtoets.Piping.Primitives/PipingSoilLayer.cs	(.../PipingSoilLayer.cs)	(revision 686466dda6406ee2c7fb1f33faa60494878b1fc8)
+++ Ringtoets/Piping/src/Ringtoets.Piping.Primitives/PipingSoilLayer.cs	(.../PipingSoilLayer.cs)	(revision d67d84b0725d8e7192f1b8e2649eab0a5b1dcb69)
@@ -173,13 +173,10 @@
         {
             unchecked
             {
-                int hashCode = materialName?.GetHashCode() ?? 0;
-                hashCode = (hashCode * 397) ^ Top.GetHashCode();
-                hashCode = (hashCode * 397) ^ IsAquifer.GetHashCode();
+                int hashCode = Top.GetHashCode();
                 hashCode = (hashCode * 397) ^ BelowPhreaticLevel.GetHashCode();
                 hashCode = (hashCode * 397) ^ DiameterD70.GetHashCode();
                 hashCode = (hashCode * 397) ^ Permeability.GetHashCode();
-                hashCode = (hashCode * 397) ^ Color.GetHashCode();
                 return hashCode;
             }
         }