diff --git a/app/models/post.rb b/app/models/post.rb
index 9ad7162c8..cf541cd6e 100644
--- a/app/models/post.rb
+++ b/app/models/post.rb
@@ -353,11 +353,6 @@ class Post < ActiveRecord::Base
       @tag_array_was ||= Tag.scan_tags(tag_string_was)
     end
 
-    def create_tags
-      reset_tag_array_cache
-      set_tag_string(tag_array.map {|x| Tag.find_or_create_by_name(x).name}.uniq.sort.join(" "))
-    end
-
     def increment_tag_post_counts
       Tag.update_all("post_count = post_count + 1", {:name => tag_array}) if tag_array.any?
     end
@@ -446,10 +441,10 @@ class Post < ActiveRecord::Base
     end
 
     def normalize_tags
-      create_tags
       normalized_tags = Tag.scan_tags(tag_string)
       normalized_tags = filter_metatags(normalized_tags)
       normalized_tags = normalized_tags.map{|tag| tag.downcase}
+      normalized_tags = normalized_tags.map {|x| Tag.find_or_create_by_name(x).name}
       normalized_tags = TagAlias.to_aliased(normalized_tags)
       normalized_tags = TagImplication.with_descendants(normalized_tags)
       normalized_tags = %w(tagme) if normalized_tags.empty?
diff --git a/test/unit/post_test.rb b/test/unit/post_test.rb
index 8903b57f1..3dad74be9 100644
--- a/test/unit/post_test.rb
+++ b/test/unit/post_test.rb
@@ -492,6 +492,23 @@ class PostTest < ActiveSupport::TestCase
             end
           end
 
+          context "negated" do
+            setup do
+              @pool = FactoryGirl.create(:pool)
+              @post = FactoryGirl.create(:post, :tag_string => "aaa")
+              @post.add_pool!(@pool)
+              @post.tag_string = "aaa -pool:#{@pool.id}"
+              @post.save
+            end
+
+            should "remove the post from the pool" do
+              @post.reload
+              @pool.reload
+              assert_equal("", @pool.post_ids)
+              assert_equal("", @post.pool_string)
+            end
+          end
+
           context "id" do
             setup do
               @pool = FactoryGirl.create(:pool)