diff --git a/hypha/apply/activity/messaging.py b/hypha/apply/activity/messaging.py
index e73025fe572ddd68c2585b2a52fce32d6f5ffcff..5ac52916b8b889f31bfac5ecdef8fea2ec908663 100644
--- a/hypha/apply/activity/messaging.py
+++ b/hypha/apply/activity/messaging.py
@@ -597,14 +597,18 @@ class SlackAdapter(AdapterBase):
         return f'<{user.slack}>'
 
     def slack_channels(self, source, **kwargs):
+        # Set the default room as a start.
         target_rooms = [self.target_room]
         try:
-            extra_rooms = source.get_from_parent('slack_channel').split(',')
+            fund_slack_channel = source.get_from_parent('slack_channel').split(',')
         except AttributeError:
-            # Not a submission object, no extra rooms.
+            # Not a submission object.
             pass
         else:
-            target_rooms.extend(extra_rooms)
+            # If there are custom rooms, set them in place of the default room
+            custom_rooms = [channel for channel in fund_slack_channel if channel]
+            if len(custom_rooms) > 0:
+                target_rooms = custom_rooms
 
         try:
             comment = kwargs['comment']
@@ -621,7 +625,7 @@ class SlackAdapter(AdapterBase):
 
         # Make sure each channel name starts with a "#".
         target_rooms = [
-            room if room.startswith('#') else '#' + room
+            room.strip() if room.startswith('#') else '#' + room.strip()
             for room in target_rooms
             if room
         ]
diff --git a/hypha/apply/activity/tests/test_messaging.py b/hypha/apply/activity/tests/test_messaging.py
index 73e9ab5ad252fc929c7e429bfd612261ff014541..6aa2fe27c6eb193c9d99c685275276796a2ad850 100644
--- a/hypha/apply/activity/tests/test_messaging.py
+++ b/hypha/apply/activity/tests/test_messaging.py
@@ -380,7 +380,7 @@ class TestSlackAdapter(AdapterMixin, TestCase):
         SLACK_DESTINATION_ROOM=target_room,
     )
     @responses.activate
-    def test_round_slack_channel(self):
+    def test_fund_custom_slack_channel(self):
         responses.add(responses.POST, self.target_url, status=200, body='OK')
         submission = ApplicationSubmissionFactory(round__parent__slack_channel='dummy')
         adapter = SlackAdapter()
@@ -390,7 +390,27 @@ class TestSlackAdapter(AdapterMixin, TestCase):
         self.assertDictEqual(
             json.loads(responses.calls[0].request.body),
             {
-                'room': [self.target_room, '#dummy'],
+                'room': ['#dummy'],
+                'message': message,
+            }
+        )
+
+    @override_settings(
+        SLACK_DESTINATION_URL=target_url,
+        SLACK_DESTINATION_ROOM=target_room,
+    )
+    @responses.activate
+    def test_fund_multiple_custom_slack_channel(self):
+        responses.add(responses.POST, self.target_url, status=200, body='OK')
+        submission = ApplicationSubmissionFactory(round__parent__slack_channel='dummy1, dummy2')
+        adapter = SlackAdapter()
+        message = 'my message'
+        adapter.send_message(message, '', source=submission)
+        self.assertEqual(len(responses.calls), 1)
+        self.assertDictEqual(
+            json.loads(responses.calls[0].request.body),
+            {
+                'room': ['#dummy1', '#dummy2'],
                 'message': message,
             }
         )
diff --git a/hypha/apply/funds/migrations/0075_auto_20200629_1707.py b/hypha/apply/funds/migrations/0075_auto_20200629_1707.py
new file mode 100644
index 0000000000000000000000000000000000000000..96dc9feef8d52bd10911fa83084307c1881503e0
--- /dev/null
+++ b/hypha/apply/funds/migrations/0075_auto_20200629_1707.py
@@ -0,0 +1,18 @@
+# Generated by Django 2.2.13 on 2020-06-29 17:07
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('funds', '0074_add_word_limit_to_text_blocks'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='applicationbase',
+            name='slack_channel',
+            field=models.CharField(blank=True, help_text='The slack #channel for notifications. If left empty, notifications will go to the default channel.', max_length=128),
+        ),
+    ]
diff --git a/hypha/apply/funds/models/applications.py b/hypha/apply/funds/models/applications.py
index a38bad9047d54c26e4453d6204df18e841912a16..19d1a52289e538580122569cd1bbcda6f3dadc70 100644
--- a/hypha/apply/funds/models/applications.py
+++ b/hypha/apply/funds/models/applications.py
@@ -79,7 +79,7 @@ class ApplicationBase(EmailForm, WorkflowStreamForm):  # type: ignore
 
     guide_link = models.URLField(blank=True, max_length=255, help_text=_('Link to the apply guide.'))
 
-    slack_channel = models.CharField(blank=True, max_length=128, help_text=_('The slack #channel for notifications.'))
+    slack_channel = models.CharField(blank=True, max_length=128, help_text=_('The slack #channel for notifications. If left empty, notifications will go to the default channel.'))
 
     objects = PageManager.from_queryset(ApplicationBaseManager)()