diff --git a/zfs-backup.py b/zfs-backup.py
index 44d8541..72dcf13 100755
--- a/zfs-backup.py
+++ b/zfs-backup.py
@@ -278,13 +278,14 @@ class ZFS:
         )
 
     @staticmethod
-    def scrub(pool: str, *, wait_for_finish=True) -> None:
+    def scrub(pool: Pool, *, wait_for_finish: bool = True) -> None:
+        if not isinstance(pool, Pool):
+            raise TypeError("Can only scrub pools.")
         # TODO: check if scrub already in progress
-        run_command([config.ZPOOL, "scrub", pool])
+        run_command([config.ZPOOL, "scrub", pool.name])
         if wait_for_finish:
             # TODO make Ctrl-c interrupt this
-            run_command([config.ZPOOL, "wait", "-t", "scrub", pool])
-
+            run_command([config.ZPOOL, "wait", "-t", "scrub", pool.name])
     # TODO raise error if pool is not healthy
 
 
@@ -373,7 +374,7 @@ class ExternalPool(Pool):
 
     def scrub(self) -> None:
         print(f"Scrubbing {self._name}")
-        ZFS.scrub(self._name)
+        ZFS.scrub(self)
 
     @classmethod
     def find_from_dict(cls, backup_pools: dict[str, UUID]) -> ExternalPool: