diff --git a/mlx90640/mlx90640_lcd_display.c b/mlx90640/mlx90640_lcd_display.c
index 24920a3..16bd265 100644
--- a/mlx90640/mlx90640_lcd_display.c
+++ b/mlx90640/mlx90640_lcd_display.c
@@ -20,7 +20,9 @@
 paramsMLX90640 mlx90640;
 static uint16_t eeMLX90640[832];  
 int status;
-volatile uint8_t draw_legend_once=0, normalPeopleTemp=32, blackOutTag=0, waterTempThreshold=20, normalWaterTemp=25, detectCycle=0, v_water_cnt=0,h_water_cnt=0, spot_cnt=0;
+volatile uint8_t draw_legend_once=0, normalPeopleTemp=32, blackOutTag=0;
+volatile uint8_t waterTempThreshold=18, normalWaterTemp=25;
+volatile uint8_t detectCycle=0, v_water_cnt=0,h_water_cnt=0, spot_cnt=0;
 // start with some initial colors
 volatile float minTemp = -20.0f;
 volatile float maxTemp = 120.0f;
@@ -327,7 +329,7 @@ void blackOutFilter(void)
 				//simple edge finding  --end
 
 
-				if ((temp1 + (float)(waterTempThreshold / 10.0)) < max(averageTemp, normalWaterTemp))
+				if ((temp1 + (float)(waterTempThreshold / 10.0)) <  averageTemp )   // was max(averageTemp, normalWaterTemp))
 				{
 					if (blackOutTag == 0) {