diff --git a/IPhreeqc.2005.vcproj b/IPhreeqc.2005.vcproj
index 583906af..42c7486b 100644
--- a/IPhreeqc.2005.vcproj
+++ b/IPhreeqc.2005.vcproj
@@ -1097,6 +1097,10 @@
 				RelativePath=".\IPhreeqc.rc"
 				>
 			</File>
+			<File
+				RelativePath=".\src\IPhreeqc_interface_F.cpp"
+				>
+			</File>
 			<File
 				RelativePath=".\src\IPhreeqcF.f"
 				>
diff --git a/all/fortran/advect.vfproj b/all/fortran/advect.vfproj
index e5277941..e6a77dfa 100644
--- a/all/fortran/advect.vfproj
+++ b/all/fortran/advect.vfproj
@@ -5,7 +5,7 @@
 		<Platform Name="x64"/></Platforms>
 	<Configurations>
 		<Configuration Name="Debug|Win32" OutputDirectory="$(SolutionDir)$(ConfigurationName)">
-				<Tool Name="VFFortranCompilerTool" SuppressStartupBanner="true" DebugInformationFormat="debugEnabled" Optimization="optimizeDisabled" AdditionalIncludeDirectories="../../src;../../src/phreeqcpp" Interfaces="true" FixedFormLineLength="fixedLength132" WarnInterfaces="true" StringLengthArgPassing="strLenArgsMixed" Traceback="true" BoundsCheck="true" RuntimeLibrary="rtMultiThreadedDebug"/>
+				<Tool Name="VFFortranCompilerTool" SuppressStartupBanner="true" DebugInformationFormat="debugEnabled" Optimization="optimizeDisabled" Preprocess="preprocessYes" AdditionalIncludeDirectories="../../src;../../src/phreeqcpp" Interfaces="true" FixedFormLineLength="fixedLength132" WarnInterfaces="true" StringLengthArgPassing="strLenArgsMixed" Traceback="true" BoundsCheck="true" RuntimeLibrary="rtMultiThreadedDebug"/>
 				<Tool Name="VFLinkerTool" LinkIncremental="linkIncrementalNo" SuppressStartupBanner="true" AdditionalLibraryDirectories="../../lib" GenerateDebugInformation="true" SubSystem="subSystemConsole" AdditionalDependencies="IPhreeqcd.lib"/>
 				<Tool Name="VFResourceCompilerTool"/>
 				<Tool Name="VFMidlTool" SuppressStartupBanner="true"/>
@@ -15,7 +15,7 @@
 				<Tool Name="VFPostBuildEventTool"/>
 				<Tool Name="VFManifestTool" SuppressStartupBanner="true"/></Configuration>
 		<Configuration Name="Release|Win32" OutputDirectory="$(SolutionDir)$(ConfigurationName)">
-				<Tool Name="VFFortranCompilerTool" SuppressStartupBanner="true" AdditionalIncludeDirectories="../../src;../../src/phreeqcpp" StringLengthArgPassing="strLenArgsMixed"/>
+				<Tool Name="VFFortranCompilerTool" SuppressStartupBanner="true" Preprocess="preprocessYes" AdditionalIncludeDirectories="../../src;../../src/phreeqcpp" StringLengthArgPassing="strLenArgsMixed"/>
 				<Tool Name="VFLinkerTool" LinkIncremental="linkIncrementalNo" SuppressStartupBanner="true" AdditionalLibraryDirectories="../../lib" SubSystem="subSystemConsole" AdditionalDependencies="IPhreeqc.lib"/>
 				<Tool Name="VFResourceCompilerTool"/>
 				<Tool Name="VFMidlTool" SuppressStartupBanner="true"/>
@@ -25,7 +25,7 @@
 				<Tool Name="VFPostBuildEventTool"/>
 				<Tool Name="VFManifestTool" SuppressStartupBanner="true"/></Configuration>
 		<Configuration Name="DebugDll|Win32" OutputDirectory="$(SolutionDir)$(ConfigurationName)">
-				<Tool Name="VFFortranCompilerTool" SuppressStartupBanner="true" DebugInformationFormat="debugEnabled" Optimization="optimizeDisabled" AdditionalIncludeDirectories="../../src;../../src/phreeqcpp" Interfaces="true" FixedFormLineLength="fixedLength132" WarnInterfaces="true" StringLengthArgPassing="strLenArgsMixed" Traceback="true" BoundsCheck="true" RuntimeLibrary="rtMultiThreadedDebugDLL"/>
+				<Tool Name="VFFortranCompilerTool" SuppressStartupBanner="true" DebugInformationFormat="debugEnabled" Optimization="optimizeDisabled" Preprocess="preprocessYes" AdditionalIncludeDirectories="../../src;../../src/phreeqcpp" Interfaces="true" FixedFormLineLength="fixedLength132" WarnInterfaces="true" StringLengthArgPassing="strLenArgsMixed" Traceback="true" BoundsCheck="true" RuntimeLibrary="rtMultiThreadedDebugDLL"/>
 				<Tool Name="VFLinkerTool" LinkIncremental="linkIncrementalNo" SuppressStartupBanner="true" AdditionalLibraryDirectories="../../dll" GenerateDebugInformation="true" SubSystem="subSystemConsole" AdditionalDependencies="IPhreeqcd.lib"/>
 				<Tool Name="VFResourceCompilerTool"/>
 				<Tool Name="VFMidlTool" SuppressStartupBanner="true"/>
@@ -35,7 +35,7 @@
 				<Tool Name="VFPostBuildEventTool"/>
 				<Tool Name="VFManifestTool" SuppressStartupBanner="true"/></Configuration>
 		<Configuration Name="ReleaseDll|Win32" OutputDirectory="$(SolutionDir)$(ConfigurationName)">
-				<Tool Name="VFFortranCompilerTool" SuppressStartupBanner="true" AdditionalIncludeDirectories="../../src;../../src/phreeqcpp" StringLengthArgPassing="strLenArgsMixed" RuntimeLibrary="rtMultiThreadedDLL"/>
+				<Tool Name="VFFortranCompilerTool" SuppressStartupBanner="true" Preprocess="preprocessYes" AdditionalIncludeDirectories="../../src;../../src/phreeqcpp" StringLengthArgPassing="strLenArgsMixed" RuntimeLibrary="rtMultiThreadedDLL"/>
 				<Tool Name="VFLinkerTool" LinkIncremental="linkIncrementalNo" SuppressStartupBanner="true" AdditionalLibraryDirectories="../../dll" SubSystem="subSystemConsole" AdditionalDependencies="IPhreeqc.lib"/>
 				<Tool Name="VFResourceCompilerTool"/>
 				<Tool Name="VFMidlTool" SuppressStartupBanner="true"/>
@@ -45,7 +45,7 @@
 				<Tool Name="VFPostBuildEventTool"/>
 				<Tool Name="VFManifestTool" SuppressStartupBanner="true"/></Configuration>
 		<Configuration Name="Debug|x64">
-				<Tool Name="VFFortranCompilerTool" SuppressStartupBanner="true" DebugInformationFormat="debugEnabled" Optimization="optimizeDisabled" AdditionalIncludeDirectories="../../src;../../src/phreeqcpp" Interfaces="true" FixedFormLineLength="fixedLength132" WarnInterfaces="true" StringLengthArgPassing="strLenArgsMixed" Traceback="true" BoundsCheck="true" RuntimeLibrary="rtMultiThreadedDebug"/>
+				<Tool Name="VFFortranCompilerTool" SuppressStartupBanner="true" DebugInformationFormat="debugEnabled" Optimization="optimizeDisabled" Preprocess="preprocessYes" AdditionalIncludeDirectories="../../src;../../src/phreeqcpp" Interfaces="true" FixedFormLineLength="fixedLength132" WarnInterfaces="true" StringLengthArgPassing="strLenArgsMixed" Traceback="true" BoundsCheck="true" RuntimeLibrary="rtMultiThreadedDebug"/>
 				<Tool Name="VFLinkerTool" LinkIncremental="linkIncrementalNo" SuppressStartupBanner="true" AdditionalLibraryDirectories="../../libx64" GenerateDebugInformation="true" SubSystem="subSystemConsole" AdditionalDependencies="IPhreeqcd.lib"/>
 				<Tool Name="VFResourceCompilerTool"/>
 				<Tool Name="VFMidlTool" SuppressStartupBanner="true" TargetEnvironment="midlTargetAMD64"/>
@@ -55,7 +55,7 @@
 				<Tool Name="VFPostBuildEventTool"/>
 				<Tool Name="VFManifestTool" SuppressStartupBanner="true"/></Configuration>
 		<Configuration Name="Release|x64">
-				<Tool Name="VFFortranCompilerTool" SuppressStartupBanner="true" AdditionalIncludeDirectories="../../src;../../src/phreeqcpp" StringLengthArgPassing="strLenArgsMixed"/>
+				<Tool Name="VFFortranCompilerTool" SuppressStartupBanner="true" Preprocess="preprocessYes" AdditionalIncludeDirectories="../../src;../../src/phreeqcpp" StringLengthArgPassing="strLenArgsMixed"/>
 				<Tool Name="VFLinkerTool" LinkIncremental="linkIncrementalNo" SuppressStartupBanner="true" AdditionalLibraryDirectories="../../libx64" SubSystem="subSystemConsole" AdditionalDependencies="IPhreeqc.lib"/>
 				<Tool Name="VFResourceCompilerTool"/>
 				<Tool Name="VFMidlTool" SuppressStartupBanner="true" TargetEnvironment="midlTargetAMD64"/>
@@ -65,7 +65,7 @@
 				<Tool Name="VFPostBuildEventTool"/>
 				<Tool Name="VFManifestTool" SuppressStartupBanner="true"/></Configuration>
 		<Configuration Name="DebugDll|x64">
-				<Tool Name="VFFortranCompilerTool" SuppressStartupBanner="true" DebugInformationFormat="debugEnabled" Optimization="optimizeDisabled" AdditionalIncludeDirectories="../../src;../../src/phreeqcpp" Interfaces="true" FixedFormLineLength="fixedLength132" WarnInterfaces="true" StringLengthArgPassing="strLenArgsMixed" Traceback="true" BoundsCheck="true" RuntimeLibrary="rtMultiThreadedDebugDLL"/>
+				<Tool Name="VFFortranCompilerTool" SuppressStartupBanner="true" DebugInformationFormat="debugEnabled" Optimization="optimizeDisabled" Preprocess="preprocessYes" AdditionalIncludeDirectories="../../src;../../src/phreeqcpp" Interfaces="true" FixedFormLineLength="fixedLength132" WarnInterfaces="true" StringLengthArgPassing="strLenArgsMixed" Traceback="true" BoundsCheck="true" RuntimeLibrary="rtMultiThreadedDebugDLL"/>
 				<Tool Name="VFLinkerTool" LinkIncremental="linkIncrementalNo" SuppressStartupBanner="true" AdditionalLibraryDirectories="../../dllx64" GenerateDebugInformation="true" SubSystem="subSystemConsole" AdditionalDependencies="IPhreeqcd.lib"/>
 				<Tool Name="VFResourceCompilerTool"/>
 				<Tool Name="VFMidlTool" SuppressStartupBanner="true" TargetEnvironment="midlTargetAMD64"/>
@@ -75,7 +75,7 @@
 				<Tool Name="VFPostBuildEventTool"/>
 				<Tool Name="VFManifestTool" SuppressStartupBanner="true"/></Configuration>
 		<Configuration Name="ReleaseDll|x64">
-				<Tool Name="VFFortranCompilerTool" SuppressStartupBanner="true" AdditionalIncludeDirectories="../../src;../../src/phreeqcpp" StringLengthArgPassing="strLenArgsMixed" RuntimeLibrary="rtMultiThreadedDLL"/>
+				<Tool Name="VFFortranCompilerTool" SuppressStartupBanner="true" Preprocess="preprocessYes" AdditionalIncludeDirectories="../../src;../../src/phreeqcpp" StringLengthArgPassing="strLenArgsMixed" RuntimeLibrary="rtMultiThreadedDLL"/>
 				<Tool Name="VFLinkerTool" LinkIncremental="linkIncrementalNo" SuppressStartupBanner="true" AdditionalLibraryDirectories="../../dllx64" SubSystem="subSystemConsole" AdditionalDependencies="IPhreeqc.lib"/>
 				<Tool Name="VFResourceCompilerTool"/>
 				<Tool Name="VFMidlTool" SuppressStartupBanner="true" TargetEnvironment="midlTargetAMD64"/>
@@ -85,7 +85,7 @@
 				<Tool Name="VFPostBuildEventTool"/>
 				<Tool Name="VFManifestTool" SuppressStartupBanner="true"/></Configuration>
 		<Configuration Name="ReleaseCLR|Win32" OutputDirectory="$(SolutionDir)$(ConfigurationName)">
-				<Tool Name="VFFortranCompilerTool" SuppressStartupBanner="true" AdditionalIncludeDirectories="../../src;../../src/phreeqcpp" StringLengthArgPassing="strLenArgsMixed" RuntimeLibrary="rtMultiThreadedDLL"/>
+				<Tool Name="VFFortranCompilerTool" SuppressStartupBanner="true" Preprocess="preprocessYes" AdditionalIncludeDirectories="../../src;../../src/phreeqcpp" StringLengthArgPassing="strLenArgsMixed" RuntimeLibrary="rtMultiThreadedDLL"/>
 				<Tool Name="VFLinkerTool" LinkIncremental="linkIncrementalNo" SuppressStartupBanner="true" AdditionalLibraryDirectories="../../clr" SubSystem="subSystemConsole" AdditionalDependencies="IPhreeqc.lib"/>
 				<Tool Name="VFResourceCompilerTool"/>
 				<Tool Name="VFMidlTool" SuppressStartupBanner="true"/>
@@ -95,7 +95,7 @@
 				<Tool Name="VFPostBuildEventTool"/>
 				<Tool Name="VFManifestTool" SuppressStartupBanner="true"/></Configuration>
 		<Configuration Name="ReleaseCLR|x64">
-				<Tool Name="VFFortranCompilerTool" SuppressStartupBanner="true" AdditionalIncludeDirectories="../../src;../../src/phreeqcpp" StringLengthArgPassing="strLenArgsMixed" RuntimeLibrary="rtMultiThreadedDLL"/>
+				<Tool Name="VFFortranCompilerTool" SuppressStartupBanner="true" Preprocess="preprocessYes" AdditionalIncludeDirectories="../../src;../../src/phreeqcpp" StringLengthArgPassing="strLenArgsMixed" RuntimeLibrary="rtMultiThreadedDLL"/>
 				<Tool Name="VFLinkerTool" LinkIncremental="linkIncrementalNo" SuppressStartupBanner="true" AdditionalLibraryDirectories="../../dllx64" SubSystem="subSystemConsole" AdditionalDependencies="IPhreeqc.lib"/>
 				<Tool Name="VFResourceCompilerTool"/>
 				<Tool Name="VFMidlTool" SuppressStartupBanner="true" TargetEnvironment="midlTargetAMD64"/>
@@ -105,7 +105,7 @@
 				<Tool Name="VFPostBuildEventTool"/>
 				<Tool Name="VFManifestTool" SuppressStartupBanner="true"/></Configuration>
 		<Configuration Name="DebugCLR|Win32" OutputDirectory="$(SolutionDir)$(ConfigurationName)">
-				<Tool Name="VFFortranCompilerTool" SuppressStartupBanner="true" DebugInformationFormat="debugEnabled" Optimization="optimizeDisabled" AdditionalIncludeDirectories="../../src;../../src/phreeqcpp" Interfaces="true" FixedFormLineLength="fixedLength132" WarnInterfaces="true" StringLengthArgPassing="strLenArgsMixed" Traceback="true" BoundsCheck="true" RuntimeLibrary="rtMultiThreadedDebugDLL"/>
+				<Tool Name="VFFortranCompilerTool" SuppressStartupBanner="true" DebugInformationFormat="debugEnabled" Optimization="optimizeDisabled" Preprocess="preprocessYes" AdditionalIncludeDirectories="../../src;../../src/phreeqcpp" Interfaces="true" FixedFormLineLength="fixedLength132" WarnInterfaces="true" StringLengthArgPassing="strLenArgsMixed" Traceback="true" BoundsCheck="true" RuntimeLibrary="rtMultiThreadedDebugDLL"/>
 				<Tool Name="VFLinkerTool" LinkIncremental="linkIncrementalNo" SuppressStartupBanner="true" AdditionalLibraryDirectories="../../clr" GenerateDebugInformation="true" SubSystem="subSystemConsole" AdditionalDependencies="IPhreeqcd.lib"/>
 				<Tool Name="VFResourceCompilerTool"/>
 				<Tool Name="VFMidlTool" SuppressStartupBanner="true"/>
@@ -115,7 +115,7 @@
 				<Tool Name="VFPostBuildEventTool"/>
 				<Tool Name="VFManifestTool" SuppressStartupBanner="true"/></Configuration>
 		<Configuration Name="DebugCLR|x64">
-				<Tool Name="VFFortranCompilerTool" SuppressStartupBanner="true" DebugInformationFormat="debugEnabled" Optimization="optimizeDisabled" AdditionalIncludeDirectories="../../src;../../src/phreeqcpp" Interfaces="true" FixedFormLineLength="fixedLength132" WarnInterfaces="true" StringLengthArgPassing="strLenArgsMixed" Traceback="true" BoundsCheck="true" RuntimeLibrary="rtMultiThreadedDebugDLL"/>
+				<Tool Name="VFFortranCompilerTool" SuppressStartupBanner="true" DebugInformationFormat="debugEnabled" Optimization="optimizeDisabled" Preprocess="preprocessYes" AdditionalIncludeDirectories="../../src;../../src/phreeqcpp" Interfaces="true" FixedFormLineLength="fixedLength132" WarnInterfaces="true" StringLengthArgPassing="strLenArgsMixed" Traceback="true" BoundsCheck="true" RuntimeLibrary="rtMultiThreadedDebugDLL"/>
 				<Tool Name="VFLinkerTool" LinkIncremental="linkIncrementalNo" SuppressStartupBanner="true" AdditionalLibraryDirectories="../../dllx64" GenerateDebugInformation="true" SubSystem="subSystemConsole" AdditionalDependencies="IPhreeqcd.lib"/>
 				<Tool Name="VFResourceCompilerTool"/>
 				<Tool Name="VFMidlTool" SuppressStartupBanner="true" TargetEnvironment="midlTargetAMD64"/>
@@ -129,5 +129,6 @@
 		<File RelativePath="..\..\src\IPhreeqc.f90.inc"/></Filter>
 		<Filter Name="Resource Files" Filter="rc;ico;cur;bmp;dlg;rc2;rct;bin;rgs;gif;jpg;jpeg;jpe"/>
 		<Filter Name="Source Files" Filter="f90;for;f;fpp;ftn;def;odl;idl">
-		<File RelativePath="..\..\examples\fortran\advect\advect.f90"/></Filter></Files>
+		<File RelativePath="..\..\examples\fortran\advect\advect.f90"/>
+		<File RelativePath="..\..\src\IPhreeqc_interface.F90"/></Filter></Files>
 	<Globals/></VisualStudioProject>