diff --git a/EnhancedSolver/2D-seq/src/grid.h b/EnhancedSolver/2D-seq/src/grid.h
index 218ffa9..14c4f44 100644
--- a/EnhancedSolver/2D-seq/src/grid.h
+++ b/EnhancedSolver/2D-seq/src/grid.h
@@ -33,6 +33,6 @@ typedef struct {
 
 static inline int gridIsFluid(Grid* g, int i, int j)
 {
-    return g->s[j * (g->imax + 2) + i];
+    return g->s[j * (g->imax + 2) + i] == FLUID;
 }
 #endif // __GRID_H_
diff --git a/EnhancedSolver/2D-seq/src/particletracing.c b/EnhancedSolver/2D-seq/src/particletracing.c
index 5750b0c..07d575d 100644
--- a/EnhancedSolver/2D-seq/src/particletracing.c
+++ b/EnhancedSolver/2D-seq/src/particletracing.c
@@ -110,6 +110,8 @@ static void compress(ParticleTracer* p)
     Particle tempPool[p->totalParticles];
     int totalParticles = 0;
 
+    printf("Performing compression ...");
+
     for (int i = 0; i < p->totalParticles; i++) {
         if (memPool[i].flag == 1) {
             tempPool[totalParticles].x    = memPool[i].x;
@@ -119,6 +121,7 @@ static void compress(ParticleTracer* p)
         }
     }
 
+    printf(" remove %d particles\n", p->totalParticles - totalParticles);
     p->totalParticles   = totalParticles;
     p->removedParticles = 0;
     p->pointer          = totalParticles + 1;