diff --git a/app/helpers/service_helper.py b/app/helpers/service_helper.py
index 7cee388..6800f8a 100644
--- a/app/helpers/service_helper.py
+++ b/app/helpers/service_helper.py
@@ -3,6 +3,7 @@ import io
 import re
 from tokenize import String
 
+from models.item import Item
 
 def items_csv_to_dict(items_csv_reader, solver_run):
     items = []
@@ -41,7 +42,15 @@ def items_csv_to_dict(items_csv_reader, solver_run):
                         if row[key]:
                             item[col] = row[key]
 
-                items.append(item)
+                # confirm item is only added if it meets the criteria of 100% constraints as a pre-filter
+                valid_item = True
+                item = Item.parse_obj(item)
+                for constraint in solver_run.constraints:
+                  attribute = item.get_attribute(constraint.reference_attribute)
+                  if attribute and constraint.minimum == 100 and int(attribute.value) == 0:
+                    valid_item = False
+
+                if valid_item: items.append(item)
 
     return items
 
diff --git a/app/services/loft_service.py b/app/services/loft_service.py
index 32ea6f2..8a40bfd 100644
--- a/app/services/loft_service.py
+++ b/app/services/loft_service.py
@@ -53,9 +53,7 @@ class LoftService(Base):
         items_csv_reader = csv_helper.file_stream_reader(items_csv)
 
         # add items to solver run
-        for item in service_helper.items_csv_to_dict(items_csv_reader,
-                                                     solver_run):
-            solver_run.items.append(Item.parse_obj(item))
+        solver_run.items = service_helper.items_csv_to_dict(items_csv_reader, solver_run)
 
         logging.info('Processed Attributes...')