diff --git a/history/models.py b/history/models.py
index e102cb0..5296478 100644
--- a/history/models.py
+++ b/history/models.py
@@ -9,9 +9,9 @@ class HistorySync(models.Model):
 
     company = models.ForeignKey('companies.Company', on_delete=models.DO_NOTHING, null=True)
     rss_url = models.URLField('URL del feed', null=True, blank=True)
-    sync_date = models.DateTimeField('Fecha de lanzamiento', null=True)
+    sync_date = models.DateTimeField('Fecha de lanzamiento', null=True, blank=True)
     result = models.TextField('Resultado', null=True, blank=True)
-    quantity = models.PositiveIntegerField('Productos importados', null=True)
+    quantity = models.PositiveIntegerField('Productos importados', null=True, blank=True)
 
     # internal
     created = models.DateTimeField('date of creation', auto_now_add=True)
diff --git a/products/models.py b/products/models.py
index 84c7060..30631bb 100644
--- a/products/models.py
+++ b/products/models.py
@@ -33,9 +33,9 @@ class Product(models.Model):
     sourcing_date = models.DateTimeField('Fecha de importación original de producto', null=True, blank=True)
     update_date = models.DateTimeField('Fecha de actualización de producto', null=True, blank=True)
     discount = models.DecimalField('Descuento', max_digits=5, decimal_places=2, null=True, blank=True)
-    stock = models.PositiveIntegerField('Stock', null=True)
+    stock = models.PositiveIntegerField('Stock', null=True, blank=True)
     tags = TagField(to=TreeTag)
-    category = SingleTagField(blank=True, null=True) # main tag category
+    category = SingleTagField(null=True, blank=True) # main tag category
     attributes = TagField(to=TreeTag, related_name='product_attributes')
     identifiers = models.TextField('Identificador único de producto', null=True, blank=True)
 
diff --git a/products/tests.py b/products/tests.py
index d32e1f6..b3a33ce 100644
--- a/products/tests.py
+++ b/products/tests.py
@@ -163,6 +163,58 @@ class ProductViewSetTest(APITestCase):
         # Assert number of instnaces in response
         self.assertEquals(len(expected_instance), len(payload))
 
+    def test_anon_user_can_filter_company(self):
+        # create instances
+        company = CompanyFactory()
+        expected_instance = [
+            self.factory(category='ropa', tags="zapatos, rojos", company=company),
+            self.factory(category='ropa', tags="rojos", company=company),
+            self.factory(category='ropa', tags="colores/rojos", company=company)
+        ]
+        unexpected_instance = [
+            self.factory(category='roperos', tags="zapatos, azules"),
+            self.factory(category='enropados', tags="xxl")
+        ]
+
+        # prepare url
+        url = f"{self.endpoint}?company={company.id}"
+
+        # Request list
+        response = self.client.get(url)
+        payload = response.json()
+
+        # Assert access is granted
+        self.assertEqual(response.status_code, status.HTTP_200_OK)
+        # Assert number of instnaces in response
+        self.assertEquals(len(expected_instance), len(payload))
+
+    def test_anon_user_can_order_products(self):
+        # create instances
+        company = CompanyFactory()
+        unexpected_instance = [
+            self.factory(category='roperos', tags="zapatos, azules"),
+            self.factory(category='enropados', tags="xxl")
+        ]
+        expected_instance = [
+            self.factory(category='ropa', tags="zapatos, rojos", company=company),
+            self.factory(category='ropa', tags="rojos", company=company),
+            self.factory(category='ropa', tags="colores/rojos", company=company)
+        ]
+        # prepare url
+        url = f"{self.endpoint}?ordering=created"
+
+        # Request list
+        response = self.client.get(url)
+        payload = response.json()
+
+        # Assert access is granted
+        self.assertEqual(response.status_code, status.HTTP_200_OK)
+        # TODO: assert correct order
+        previous_date = datetime.datetime.now()
+        for instance in payload:
+            self.assertTrue(datetime.datetime.fromisoformat(instance['created'][:-1]) < previous_date)
+            previous_date = datetime.datetime.fromisoformat(instance['created'][:-1])
+
     # authenticated user
     def test_auth_user_can_list_instances(self):
         """Regular logged-in user can list instance
diff --git a/products/views.py b/products/views.py
index fd69c1b..69d7069 100644
--- a/products/views.py
+++ b/products/views.py
@@ -15,6 +15,7 @@ from rest_framework import viewsets
 from rest_framework.response import Response
 from rest_framework.permissions import IsAuthenticatedOrReadOnly, IsAdminUser, IsAuthenticated
 from rest_framework.decorators import api_view, permission_classes, action
+from rest_framework.filters import OrderingFilter
 
 import requests
 
@@ -41,6 +42,8 @@ class ProductViewSet(viewsets.ModelViewSet):
       queryset = Product.objects.all()
       serializer_class = ProductSerializer
       permission_classes = [IsAuthenticatedOrReadOnly, IsCreator]
+      # filter_backends = [ProductTagFilter, OrderingFilter]
+      # ordering_fields = ['created']
       filterset_class = ProductTagFilter
       filterset_fields = ['name', 'tags', 'category', 'attributes', 'company', 'created']
 
diff --git a/stats/models.py b/stats/models.py
index 1de6942..0b86ec8 100644
--- a/stats/models.py
+++ b/stats/models.py
@@ -17,11 +17,11 @@ class StatsLog(models.Model):
     action_object_object_id = models.CharField(max_length=255, blank=True, null=True)
     action_object = GenericForeignKey('action_object_content_type', 'action_object_object_id')
     user = models.ForeignKey(User, on_delete=models.DO_NOTHING, null=True)
-    anonymous = models.BooleanField('Usuario no registrado', null=True)
+    anonymous = models.BooleanField('Usuario no registrado', null=True, blank=True)
     ip_address = models.GenericIPAddressField('IP usuario', null=True, blank=True)
     geo = models.PointField('Ubicación aproximada', null=True, blank=True )
-    contact = models.BooleanField('Empresa contactada', null=True)
-    shop = models.BooleanField('Redirigido por botón "Comprar"', null=True)
+    contact = models.BooleanField('Empresa contactada', null=True, blank=True)
+    shop = models.BooleanField('Redirigido por botón "Comprar"', null=True, blank=True)
 
     # internal
     created = models.DateTimeField('date of creation', auto_now_add=True)
diff --git a/utils/tag_filters.py b/utils/tag_filters.py
index 3cc8502..e80d9a6 100644
--- a/utils/tag_filters.py
+++ b/utils/tag_filters.py
@@ -26,7 +26,7 @@ class ProductTagFilter(django_filters.FilterSet):
 
     class Meta:
         model = Product
-        fields = ['name', 'tags', 'category', 'attributes']
+        fields = ['name', 'tags', 'category', 'attributes', 'company', 'created']
 
     def tag_filter(self, queryset, name, value):
         return queryset.filter(**{