diff --git a/rdtools/soiling.py b/rdtools/soiling.py
index 04c1d012..56f05c29 100644
--- a/rdtools/soiling.py
+++ b/rdtools/soiling.py
@@ -185,9 +185,8 @@ def _calc_daily_df(self, day_scale=13, clean_threshold="infer", recenter=True,
         # step, slope change detection
         # 1/6/24 Note several errors in soiling fit due to ffill for rolling
         # median change to day_scale/2 Matt
-        #df_ffill = df.copy()
-        #df_ffill = df.ffill(limit=int(round((day_scale / 2), 0)))
-        df_ffill = df.fillna(method='ffill', limit=day_scale).copy()
+        df_ffill = df.copy()
+        df_ffill = df.ffill(limit=int(round((day_scale / 2), 0)))
         # Calculate rolling median
         df["pi_roll_med"] = df_ffill.pi_norm.rolling(day_scale, center=True).median()
 
@@ -2953,4 +2952,4 @@ def segmented_soiling_period(
     # Create Series from modelled profile
     sr = pd.Series(z, index=pr.index)
 
-    return sr, cp_date
\ No newline at end of file
+    return sr, cp_date