diff --git a/datahub/main.py b/datahub/main.py
index 75450aa..bf44feb 100644
--- a/datahub/main.py
+++ b/datahub/main.py
@@ -190,7 +190,8 @@ def get_dsr_data(
 
     log.info("Filtering data by index...")
     log.debug(f"Current DSR data length:\n\n{len(dt.dsr_data)}")
-    filtered_data = dt.dsr_data[start : end + 1 if end else end]
+    data = dt.dsr_data.copy()
+    filtered_index_data = data[start : end + 1 if end else end]
     log.debug(f"Filtered DSR data length:\n\n{len(dt.dsr_data)}")
 
     if isinstance(col, str):
@@ -206,16 +207,20 @@ def get_dsr_data(
                 raise HTTPException(status_code=400, detail=message)
 
         log.info("Filtering data by column...")
-        for frame in filtered_data:
-            delete_keys = []
+        filtered_data = []
+        for frame in filtered_index_data:
+            log.debug(f"Frame keys: {frame.keys()}")
+            filtered_keys = {}
             for key in frame.keys():
-                if key.lower() not in columns:
-                    delete_keys.append(key)
+                log.debug(f"Key: {key}")
+                if key.lower() in columns:
+                    filtered_keys[key] = frame[key]
+            log.debug(f"Filtered keys: {filtered_keys.keys()}")
+            filtered_data.append(filtered_keys)
 
-            for key in delete_keys:
-                del frame[key]
+        return ORJSONResponse({"data": filtered_data})
 
-    return ORJSONResponse({"data": filtered_data})
+    return ORJSONResponse({"data": filtered_index_data})
 
 
 @app.get("/wesim")
diff --git a/tests/test_dsr_api.py b/tests/test_dsr_api.py
index 2874532..06d5783 100644
--- a/tests/test_dsr_api.py
+++ b/tests/test_dsr_api.py
@@ -76,3 +76,12 @@ def test_get_dsr_api(dsr_data):
 
     response = client.get("/dsr?start=1")
     assert response.json()["data"][0]["Name"] == dt.dsr_data[1]["Name"]
+
+    response = client.get("/dsr?col=activities")
+    assert len(response.json()["data"][0].keys()) == 1
+    assert "Activities" in response.json()["data"][0].keys()
+
+    response = client.get("/dsr?col=activity types,kwh cost")
+    assert len(response.json()["data"][0].keys()) == 2
+    assert "Activity Types" in response.json()["data"][0].keys()
+    assert "kWh Cost" in response.json()["data"][0].keys()