diff --git a/cmd/rv/main.go b/cmd/rv/main.go
index da6d2415..ef529b54 100644
--- a/cmd/rv/main.go
+++ b/cmd/rv/main.go
@@ -120,7 +120,7 @@ const (
 
 // Turbidity sensor constants.
 const (
-	k1, k2     = 8, 8 // Block size, must be divisible by the size template with no remainder.
+	k1, k2     = 4, 4 // Block size, must be divisible by the size template with no remainder.
 	filterSize = 3    // Sobel filter size.
 	scale      = 1.0  // Amount of scale applied to sobel filter values.
 	alpha      = 1.0  // Paramater for contrast equation.
@@ -148,7 +148,7 @@ func NewTurbidityProbe(log logger.Logger, delay time.Duration) (*turbidityProbe,
 
 	// Create the turbidity sensor.
 	standard := gocv.IMRead("../../turbidity/images/template.jpg", gocv.IMReadGrayScale)
-	template := gocv.IMRead("../../turbidity/images/template.jpg", gocv.IMReadGrayScale)
+	template := gocv.IMRead("../../turbidity/images/icon.jpg", gocv.IMReadGrayScale)
 	ts, err := turbidity.NewTurbiditySensor(template, standard, k1, k2, filterSize, scale, alpha, log)
 	if err != nil {
 		log.Error("failed create turbidity sensor", "error", err.Error())
@@ -161,12 +161,14 @@ func NewTurbidityProbe(log logger.Logger, delay time.Duration) (*turbidityProbe,
 // scores of a video to the the turbidity probe.
 func (tp *turbidityProbe) Write(p []byte) (int, error) {
 	tp.buffer.Write(p)
-	select {
-	case <-tp.ticker.C:
-		go tp.turbidityCalculation(p)
-	default:
-		return len(p), nil
-	}
+	go func() {
+		select {
+		case <-tp.ticker.C:
+			tp.turbidityCalculation(p)
+		default:
+			return
+		}
+	}()
 	return len(p), nil
 }
 
diff --git a/turbidity/images/template.jpg b/turbidity/images/template.jpg
index d6165d76..3c577d1b 100644
Binary files a/turbidity/images/template.jpg and b/turbidity/images/template.jpg differ