diff --git a/position_3n_table.h b/position_3n_table.h
index 754b21c..2057691 100644
--- a/position_3n_table.h
+++ b/position_3n_table.h
@@ -195,7 +195,6 @@ public:
     long long int location; // current location (position) in reference chromosome.
     char lastBase = 'X'; // the last base of reference line. this is for CG_only mode.
     Channel<string> linePool; // pool to store unprocessed SAM line.
-    Channel<Position*> freePositionPool; // pool to store free position pointer for reference position.
     Channel<Position*> outputPositionPool; // pool to store the reference position which is loaded and ready to output.
     mutex mutex_;
     long long int refCoveredPosition; // this is the last position in reference chromosome we loaded in refPositions.
@@ -222,10 +221,10 @@ public:
             delete workerLock[i];
         }
         Position* pos;
-        freePositionPool.close();
-        while(freePositionPool.recv(pos)) {
-            delete pos;
-        }
+        // freePositionPool.close();
+        // while(freePositionPool.recv(pos)) {
+        //     delete pos;
+        // }
     }
 
     /**
@@ -478,19 +477,14 @@ public:
      * get a Position pointer from freePositionPool, if freePositionPool is empty, make a new Position pointer.
      */
     void getFreePosition(Position*& newPosition) {
-        if (freePositionPool.recv(newPosition)) {
-            return;
-        } else {
-            newPosition = new Position();
-        }
+        newPosition = new Position();
     }
 
     /**
      * return the position to freePositionPool.
      */
     void returnPosition(Position* pos) {
-        pos->initialize();
-        freePositionPool.send(pos);
+        delete pos;
     }
 
     /**