diff --git a/homeassistant/components/pooldose/const.py b/homeassistant/components/pooldose/const.py
index b486a18d6de..7e205d418ea 100644
--- a/homeassistant/components/pooldose/const.py
+++ b/homeassistant/components/pooldose/const.py
@@ -2,17 +2,20 @@
 
 from __future__ import annotations
 
-from homeassistant.const import UnitOfTemperature, UnitOfVolumeFlowRate
+from homeassistant.const import UnitOfTemperature, UnitOfVolume, UnitOfVolumeFlowRate
 
 DOMAIN = "pooldose"
 MANUFACTURER = "SEKO"
 
-# Mapping of device units to Home Assistant units
+# Mapping of device units (upper case) to Home Assistant units
 UNIT_MAPPING: dict[str, str] = {
     # Temperature units
     "°C": UnitOfTemperature.CELSIUS,
     "°F": UnitOfTemperature.FAHRENHEIT,
     # Volume flow rate units
-    "m3/h": UnitOfVolumeFlowRate.CUBIC_METERS_PER_HOUR,
-    "L/s": UnitOfVolumeFlowRate.LITERS_PER_SECOND,
+    "M3/H": UnitOfVolumeFlowRate.CUBIC_METERS_PER_HOUR,
+    "L/S": UnitOfVolumeFlowRate.LITERS_PER_SECOND,
+    # Volume units
+    "L": UnitOfVolume.LITERS,
+    "M3": UnitOfVolume.CUBIC_METERS,
 }
diff --git a/homeassistant/components/pooldose/icons.json b/homeassistant/components/pooldose/icons.json
index 456a184259d..533a34a2e07 100644
--- a/homeassistant/components/pooldose/icons.json
+++ b/homeassistant/components/pooldose/icons.json
@@ -119,6 +119,9 @@
       },
       "ph_type_dosing": {
         "default": "mdi:beaker"
+      },
+      "water_meter_total_permanent": {
+        "default": "mdi:counter"
       }
     },
     "switch": {
diff --git a/homeassistant/components/pooldose/sensor.py b/homeassistant/components/pooldose/sensor.py
index ca196e2f83b..a18e200cd5a 100644
--- a/homeassistant/components/pooldose/sensor.py
+++ b/homeassistant/components/pooldose/sensor.py
@@ -10,6 +10,7 @@ from homeassistant.components.sensor import (
     SensorDeviceClass,
     SensorEntity,
     SensorEntityDescription,
+    SensorStateClass,
 )
 from homeassistant.const import (
     CONCENTRATION_PARTS_PER_MILLION,
@@ -58,6 +59,13 @@ SENSOR_DESCRIPTIONS: tuple[PooldoseSensorEntityDescription, ...] = (
         device_class=SensorDeviceClass.VOLUME_FLOW_RATE,
         use_dynamic_unit=True,
     ),
+    PooldoseSensorEntityDescription(
+        key="water_meter_total_permanent",
+        translation_key="water_meter_total_permanent",
+        device_class=SensorDeviceClass.VOLUME,
+        state_class=SensorStateClass.TOTAL_INCREASING,
+        use_dynamic_unit=True,
+    ),
     PooldoseSensorEntityDescription(
         key="ph_type_dosing",
         translation_key="ph_type_dosing",
@@ -223,8 +231,8 @@ class PooldoseSensor(PooldoseEntity, SensorEntity):
             and (data := self.get_data()) is not None
             and (device_unit := data.get("unit"))
         ):
-            # Map device unit to Home Assistant unit, return None if unknown
-            return UNIT_MAPPING.get(device_unit)
+            # Map device unit (upper case) to Home Assistant unit, return None if unknown
+            return UNIT_MAPPING.get(device_unit.upper())
 
         # Fall back to static unit from entity description
         return super().native_unit_of_measurement
diff --git a/homeassistant/components/pooldose/strings.json b/homeassistant/components/pooldose/strings.json
index bdddd6383f0..fb6334f0637 100644
--- a/homeassistant/components/pooldose/strings.json
+++ b/homeassistant/components/pooldose/strings.json
@@ -160,6 +160,9 @@
           "acid": "pH-",
           "alcalyne": "pH+"
         }
+      },
+      "water_meter_total_permanent": {
+        "name": "Totalizer"
       }
     },
     "switch": {
diff --git a/tests/components/pooldose/fixtures/instantvalues.json b/tests/components/pooldose/fixtures/instantvalues.json
index 85849410a39..7be433dfe95 100644
--- a/tests/components/pooldose/fixtures/instantvalues.json
+++ b/tests/components/pooldose/fixtures/instantvalues.json
@@ -18,7 +18,7 @@
     },
     "flow_rate": {
       "value": 150,
-      "unit": "L/s"
+      "unit": "l/s"
     },
     "ph_type_dosing": {
       "value": "alcalyne",
@@ -75,6 +75,14 @@
     "orp_calibration_slope": {
       "value": 0.96,
       "unit": "mV"
+    },
+    "water_meter_total_permanent": {
+      "value": 12345.67,
+      "unit": "m3"
+    },
+    "water_meter_total_resettable": {
+      "value": 123.45,
+      "unit": "m3"
     }
   },
   "binary_sensor": {
diff --git a/tests/components/pooldose/snapshots/test_sensor.ambr b/tests/components/pooldose/snapshots/test_sensor.ambr
index bd899aa5b2f..f07064abcc0 100644
--- a/tests/components/pooldose/snapshots/test_sensor.ambr
+++ b/tests/components/pooldose/snapshots/test_sensor.ambr
@@ -1054,3 +1054,59 @@
     'state': '25',
   })
 # ---
+# name: test_all_sensors[sensor.pool_device_totalizer-entry]
+  EntityRegistryEntrySnapshot({
+    'aliases': set({
+    }),
+    'area_id': None,
+    'capabilities': dict({
+      'state_class': <SensorStateClass.TOTAL_INCREASING: 'total_increasing'>,
+    }),
+    'config_entry_id': <ANY>,
+    'config_subentry_id': <ANY>,
+    'device_class': None,
+    'device_id': <ANY>,
+    'disabled_by': None,
+    'domain': 'sensor',
+    'entity_category': None,
+    'entity_id': 'sensor.pool_device_totalizer',
+    'has_entity_name': True,
+    'hidden_by': None,
+    'icon': None,
+    'id': <ANY>,
+    'labels': set({
+    }),
+    'name': None,
+    'options': dict({
+      'sensor': dict({
+        'suggested_display_precision': 2,
+      }),
+    }),
+    'original_device_class': <SensorDeviceClass.VOLUME: 'volume'>,
+    'original_icon': None,
+    'original_name': 'Totalizer',
+    'platform': 'pooldose',
+    'previous_unique_id': None,
+    'suggested_object_id': None,
+    'supported_features': 0,
+    'translation_key': 'water_meter_total_permanent',
+    'unique_id': 'TEST123456789_water_meter_total_permanent',
+    'unit_of_measurement': <UnitOfVolume.CUBIC_METERS: 'm³'>,
+  })
+# ---
+# name: test_all_sensors[sensor.pool_device_totalizer-state]
+  StateSnapshot({
+    'attributes': ReadOnlyDict({
+      'device_class': 'volume',
+      'friendly_name': 'Pool Device Totalizer',
+      'state_class': <SensorStateClass.TOTAL_INCREASING: 'total_increasing'>,
+      'unit_of_measurement': <UnitOfVolume.CUBIC_METERS: 'm³'>,
+    }),
+    'context': <ANY>,
+    'entity_id': 'sensor.pool_device_totalizer',
+    'last_changed': <ANY>,
+    'last_reported': <ANY>,
+    'last_updated': <ANY>,
+    'state': '12345.67',
+  })
+# ---