Index: Ringtoets/Piping/src/Ringtoets.Piping.Forms/PropertyClasses/PipingCalculationInputsProperties.cs
===================================================================
diff -u -r9db7e282561df852a36a3ddc397450928ed17fac -re066cd81dc69dba095822a76b1c3054d878c54c5
--- Ringtoets/Piping/src/Ringtoets.Piping.Forms/PropertyClasses/PipingCalculationInputsProperties.cs	(.../PipingCalculationInputsProperties.cs)	(revision 9db7e282561df852a36a3ddc397450928ed17fac)
+++ Ringtoets/Piping/src/Ringtoets.Piping.Forms/PropertyClasses/PipingCalculationInputsProperties.cs	(.../PipingCalculationInputsProperties.cs)	(revision e066cd81dc69dba095822a76b1c3054d878c54c5)
@@ -228,18 +228,19 @@
             }
         }
 
+        [TypeConverter(typeof(ShiftedLognormalDistributionTypeConverter))]
         [ResourcesCategory(typeof(Resources), "Categories_General")]
         [ResourcesDisplayName(typeof(Resources), "PipingDataSandParticlesVolumicWeightDisplayName")]
         [ResourcesDescription(typeof(Resources), "PipingDataSandParticlesVolumicWeightDescription")]
-        public double SandParticlesVolumicWeight
+        public ShiftedLognormalDistribution SandParticlesVolumicWeight
         {
             get
             {
-                return data.PipingData.SandParticlesVolumicWeight.Mean;
+                return data.PipingData.SandParticlesVolumicWeight;
             }
             set
             {
-                data.PipingData.SandParticlesVolumicWeight.Mean = value;
+                data.PipingData.SandParticlesVolumicWeight = value;
                 data.PipingData.NotifyObservers();
             }
         }