diff --git a/config/src/main/scala/net/kemitix/thorp/config/ParseConfigFile.scala b/config/src/main/scala/net/kemitix/thorp/config/ParseConfigFile.scala
index 38fd13d..f5bf968 100644
--- a/config/src/main/scala/net/kemitix/thorp/config/ParseConfigFile.scala
+++ b/config/src/main/scala/net/kemitix/thorp/config/ParseConfigFile.scala
@@ -2,7 +2,7 @@ package net.kemitix.thorp.config
 
 import java.nio.file.Path
 
-import net.kemitix.thorp.filesystem.{FS, FileSystem}
+import net.kemitix.thorp.filesystem.FileSystem
 import zio.{IO, ZIO}
 
 trait ParseConfigFile {
@@ -16,9 +16,10 @@ trait ParseConfigFile {
           List(ConfigValidation.ErrorReadingFile(filename, h.getMessage))))
 
   private def readFile(filename: Path) =
-    FS.exists(filename.toFile)
+    FileSystem
+      .exists(filename.toFile)
       .flatMap(
-        if (_) FS.lines(filename.toFile)
+        if (_) FileSystem.lines(filename.toFile)
         else ZIO.succeed(List.empty))
 
 }
diff --git a/core/src/main/scala/net/kemitix/thorp/core/MD5HashGenerator.scala b/core/src/main/scala/net/kemitix/thorp/core/MD5HashGenerator.scala
index 3539d3b..822d10c 100644
--- a/core/src/main/scala/net/kemitix/thorp/core/MD5HashGenerator.scala
+++ b/core/src/main/scala/net/kemitix/thorp/core/MD5HashGenerator.scala
@@ -5,7 +5,7 @@ import java.nio.file.Path
 import java.security.MessageDigest
 
 import net.kemitix.thorp.domain.MD5Hash
-import net.kemitix.thorp.filesystem.{FS, FileSystem}
+import net.kemitix.thorp.filesystem.FileSystem
 import zio.{Task, TaskR}
 
 import scala.collection.immutable.NumericRange
@@ -48,7 +48,8 @@ object MD5HashGenerator {
       offset: Long,
       endOffset: Long
   ) =
-    FS.open(file, offset)
+    FileSystem
+      .open(file, offset)
       .flatMap { managedFileInputStream =>
         managedFileInputStream.use { fileInputStream =>
           digestFile(fileInputStream, offset, endOffset)
diff --git a/core/src/main/scala/net/kemitix/thorp/core/Remote.scala b/core/src/main/scala/net/kemitix/thorp/core/Remote.scala
index b6244bf..e9902d6 100644
--- a/core/src/main/scala/net/kemitix/thorp/core/Remote.scala
+++ b/core/src/main/scala/net/kemitix/thorp/core/Remote.scala
@@ -3,7 +3,7 @@ package net.kemitix.thorp.core
 import java.nio.file.Path
 
 import net.kemitix.thorp.domain.{RemoteKey, Sources}
-import net.kemitix.thorp.filesystem.{FS, FileSystem}
+import net.kemitix.thorp.filesystem.FileSystem
 import zio.{TaskR, ZIO}
 
 object Remote {
@@ -19,7 +19,7 @@ object Remote {
   ): TaskR[FileSystem, Boolean] = {
     def existsInSource(source: Path) =
       remoteKey.asFile(source, prefix) match {
-        case Some(file) => FS.exists(file)
+        case Some(file) => FileSystem.exists(file)
         case None       => ZIO.succeed(false)
       }
     ZIO
diff --git a/filesystem/src/main/scala/net/kemitix/thorp/filesystem/FS.scala b/filesystem/src/main/scala/net/kemitix/thorp/filesystem/FS.scala
deleted file mode 100644
index 06a8087..0000000
--- a/filesystem/src/main/scala/net/kemitix/thorp/filesystem/FS.scala
+++ /dev/null
@@ -1,19 +0,0 @@
-package net.kemitix.thorp.filesystem
-
-import java.io.{File, FileInputStream}
-
-import zio.{TaskR, ZIO, ZManaged}
-
-object FS {
-
-  final def exists(file: File): ZIO[FileSystem, Throwable, Boolean] =
-    ZIO.accessM(_.filesystem fileExists file)
-
-  final def open(file: File, offset: Long = 0)
-    : TaskR[FileSystem, ZManaged[FileSystem, Throwable, FileInputStream]] =
-    ZIO.accessM(_.filesystem openManagedFileInputStream (file, offset))
-
-  final def lines(file: File): TaskR[FileSystem, List[String]] =
-    ZIO.accessM(_.filesystem fileLines (file))
-
-}
diff --git a/filesystem/src/main/scala/net/kemitix/thorp/filesystem/FileSystem.scala b/filesystem/src/main/scala/net/kemitix/thorp/filesystem/FileSystem.scala
index df13978..552e677 100644
--- a/filesystem/src/main/scala/net/kemitix/thorp/filesystem/FileSystem.scala
+++ b/filesystem/src/main/scala/net/kemitix/thorp/filesystem/FileSystem.scala
@@ -76,4 +76,14 @@ object FileSystem {
         fileLinesResult
     }
   }
+
+  final def exists(file: File): ZIO[FileSystem, Throwable, Boolean] =
+    ZIO.accessM(_.filesystem fileExists file)
+
+  final def open(file: File, offset: Long = 0)
+    : TaskR[FileSystem, ZManaged[FileSystem, Throwable, FileInputStream]] =
+    ZIO.accessM(_.filesystem openManagedFileInputStream (file, offset))
+
+  final def lines(file: File): TaskR[FileSystem, List[String]] =
+    ZIO.accessM(_.filesystem fileLines (file))
 }