diff --git a/sensor/src/constants.h b/sensor/src/constants.h
index ddd8e60..5375ead 100644
--- a/sensor/src/constants.h
+++ b/sensor/src/constants.h
@@ -3,7 +3,7 @@
 //#define COMMAND_TOGGLE      "fb066666666609f6c2"
 #define COMMAND_TIME        "fb0664d4060003fc76"
 #define COMMAND_CHANGE_MODE "fb0603450e0004fb3c"
-// #define COMMAND_BLOWER      "fb06666666660af5f4"
+#define COMMAND_AUX         "fb0603450e000af5c0"
 #define COMMAND_JET1        "fb060343060006f9a2" // TODO: fix me - swapped to tmjo's panel as mine was one char short in my notes
 #define COMMAND_JET2        "fb060343060007f8b0" // TODO: fix me - swapped to tmjo's panel as mine was one char short in my notes
 #define COMMAND_EMPTY       "fb0603450e0000ff74"
@@ -26,8 +26,14 @@
 #define PUMP2_STATE_HIGH 1
 #endif 
 
+#ifdef AUX_DUAL_SPEED
+#define AUX_STATE_HIGH 2
+#else
+#define AUX_STATE_HIGH 1
+#endif 
+
 #define STATUS_BOOT 0
 #define STATUS_WIFI 2
 #define STATUS_OK 1
 #define STATUS_WAITING_DATA 3
-#define STATUS_WAITING_PANEL 4
\ No newline at end of file
+#define STATUS_WAITING_PANEL 4
diff --git a/sensor/src/sensor.ino b/sensor/src/sensor.ino
index f90687b..caf9824 100644
--- a/sensor/src/sensor.ino
+++ b/sensor/src/sensor.ino
@@ -88,6 +88,7 @@ SoftwareSerial tub;
 // Uncomment if you have dual-speed pump
 // #define PUMP1_DUAL_SPEED
 // #define PUMP2_DUAL_SPEED
+// #define AUX_DUAL_SPEED
 
 // ************************************************************************************************
 // End of config
@@ -112,6 +113,7 @@ HASelect tubMode("mode");
 HASensorNumber uptime("uptime");
 HASelect pump1("pump1");
 HASelect pump2("pump2");
+HASelect aux("aux");
 HABinarySensor heater("heater");
 HASwitch light("light");
 HASensorNumber tubpower("tubpower", HANumber::PrecisionP1);
@@ -207,6 +209,10 @@ void onPumpSwitchStateChanged(int8_t index, HASelect* sender) {
         command = COMMAND_JET2;
         options = PUMP2_STATE_HIGH + 1;
     }
+    else if (sender->getName() == "Aux") {
+        command = COMMAND_AUX;
+        options = AUX_STATE_HIGH + 1;
+    }
     setOption(currentIndex, index, options, command);
 }
 
@@ -443,6 +449,16 @@ void setup() {
     pump2.setIcon("mdi:chart-bubble");
     pump2.onCommand(onPumpSwitchStateChanged);
 
+    aux.setName("Aux");
+#ifdef AUX_DUAL_SPEED
+    aux.setOptions("Off;Medium;High");
+#else
+    aux.setOptions("Off;High");
+#endif
+    aux.setIcon("mdi:chart-bubble");
+    aux.onCommand(onPumpSwitchStateChanged);
+
+
     heater.setName("Heater");
     heater.setIcon("mdi:radiator");
     light.setName("Light");