diff --git a/installers/charm/pol/lib/charms/kafka_k8s/v0/kafka.py b/installers/charm/pol/lib/charms/kafka_k8s/v0/kafka.py
new file mode 100644
index 0000000..1baf9a8
--- /dev/null
+++ b/installers/charm/pol/lib/charms/kafka_k8s/v0/kafka.py
@@ -0,0 +1,207 @@
+# Copyright 2022 Canonical Ltd.
+# See LICENSE file for licensing details.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#    http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+# implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+"""Kafka library.
+
+This [library](https://juju.is/docs/sdk/libraries) implements both sides of the
+`kafka` [interface](https://juju.is/docs/sdk/relations).
+
+The *provider* side of this interface is implemented by the
+[kafka-k8s Charmed Operator](https://charmhub.io/kafka-k8s).
+
+Any Charmed Operator that *requires* Kafka for providing its
+service should implement the *requirer* side of this interface.
+
+In a nutshell using this library to implement a Charmed Operator *requiring*
+Kafka would look like
+
+```
+$ charmcraft fetch-lib charms.kafka_k8s.v0.kafka
+```
+
+`metadata.yaml`:
+
+```
+requires:
+  kafka:
+    interface: kafka
+    limit: 1
+```
+
+`src/charm.py`:
+
+```
+from charms.kafka_k8s.v0.kafka import KafkaEvents, KafkaRequires
+from ops.charm import CharmBase
+
+
+class MyCharm(CharmBase):
+
+    on = KafkaEvents()
+
+    def __init__(self, *args):
+        super().__init__(*args)
+        self.kafka = KafkaRequires(self)
+        self.framework.observe(
+            self.on.kafka_available,
+            self._on_kafka_available,
+        )
+        self.framework.observe(
+            self.on.kafka_broken,
+            self._on_kafka_broken,
+        )
+
+    def _on_kafka_available(self, event):
+        # Get Kafka host and port
+        host: str = self.kafka.host
+        port: int = self.kafka.port
+        # host => "kafka-k8s"
+        # port => 9092
+
+    def _on_kafka_broken(self, event):
+        # Stop service
+        # ...
+        self.unit.status = BlockedStatus("need kafka relation")
+```
+
+You can file bugs
+[here](https://github.com/charmed-osm/kafka-k8s-operator/issues)!
+"""
+
+from typing import Optional
+
+from ops.charm import CharmBase, CharmEvents
+from ops.framework import EventBase, EventSource, Object
+
+# The unique Charmhub library identifier, never change it
+from ops.model import Relation
+
+LIBID = "eacc8c85082347c9aae740e0220b8376"
+
+# Increment this major API version when introducing breaking changes
+LIBAPI = 0
+
+# Increment this PATCH version before using `charmcraft publish-lib` or reset
+# to 0 if you are raising the major API version
+LIBPATCH = 3
+
+
+KAFKA_HOST_APP_KEY = "host"
+KAFKA_PORT_APP_KEY = "port"
+
+
+class _KafkaAvailableEvent(EventBase):
+    """Event emitted when Kafka is available."""
+
+
+class _KafkaBrokenEvent(EventBase):
+    """Event emitted when Kafka relation is broken."""
+
+
+class KafkaEvents(CharmEvents):
+    """Kafka events.
+
+    This class defines the events that Kafka can emit.
+
+    Events:
+        kafka_available (_KafkaAvailableEvent)
+    """
+
+    kafka_available = EventSource(_KafkaAvailableEvent)
+    kafka_broken = EventSource(_KafkaBrokenEvent)
+
+
+class KafkaRequires(Object):
+    """Requires-side of the Kafka relation."""
+
+    def __init__(self, charm: CharmBase, endpoint_name: str = "kafka") -> None:
+        super().__init__(charm, endpoint_name)
+        self.charm = charm
+        self._endpoint_name = endpoint_name
+
+        # Observe relation events
+        event_observe_mapping = {
+            charm.on[self._endpoint_name].relation_changed: self._on_relation_changed,
+            charm.on[self._endpoint_name].relation_broken: self._on_relation_broken,
+        }
+        for event, observer in event_observe_mapping.items():
+            self.framework.observe(event, observer)
+
+    def _on_relation_changed(self, event) -> None:
+        if event.relation.app and all(
+            key in event.relation.data[event.relation.app]
+            for key in (KAFKA_HOST_APP_KEY, KAFKA_PORT_APP_KEY)
+        ):
+            self.charm.on.kafka_available.emit()
+
+    def _on_relation_broken(self, _) -> None:
+        self.charm.on.kafka_broken.emit()
+
+    @property
+    def host(self) -> str:
+        relation: Relation = self.model.get_relation(self._endpoint_name)
+        return (
+            relation.data[relation.app].get(KAFKA_HOST_APP_KEY)
+            if relation and relation.app
+            else None
+        )
+
+    @property
+    def port(self) -> int:
+        relation: Relation = self.model.get_relation(self._endpoint_name)
+        return (
+            int(relation.data[relation.app].get(KAFKA_PORT_APP_KEY))
+            if relation and relation.app
+            else None
+        )
+
+
+class KafkaProvides(Object):
+    """Provides-side of the Kafka relation."""
+
+    def __init__(self, charm: CharmBase, endpoint_name: str = "kafka") -> None:
+        super().__init__(charm, endpoint_name)
+        self._endpoint_name = endpoint_name
+
+    def set_host_info(self, host: str, port: int, relation: Optional[Relation] = None) -> None:
+        """Set Kafka host and port.
+
+        This function writes in the application data of the relation, therefore,
+        only the unit leader can call it.
+
+        Args:
+            host (str): Kafka hostname or IP address.
+            port (int): Kafka port.
+            relation (Optional[Relation]): Relation to update.
+                                           If not specified, all relations will be updated.
+
+        Raises:
+            Exception: if a non-leader unit calls this function.
+        """
+        if not self.model.unit.is_leader():
+            raise Exception("only the leader set host information.")
+
+        if relation:
+            self._update_relation_data(host, port, relation)
+            return
+
+        for relation in self.model.relations[self._endpoint_name]:
+            self._update_relation_data(host, port, relation)
+
+    def _update_relation_data(self, host: str, port: int, relation: Relation) -> None:
+        """Update data in relation if needed."""
+        relation.data[self.model.app][KAFKA_HOST_APP_KEY] = host
+        relation.data[self.model.app][KAFKA_PORT_APP_KEY] = str(port)
diff --git a/installers/charm/pol/src/charm.py b/installers/charm/pol/src/charm.py
index e2fcdb3..7b92b45 100755
--- a/installers/charm/pol/src/charm.py
+++ b/installers/charm/pol/src/charm.py
@@ -27,9 +27,9 @@
 import re
 from typing import NoReturn, Optional
 
+from charms.kafka_k8s.v0.kafka import KafkaEvents, KafkaRequires
 from ops.main import main
 from opslib.osm.charm import CharmedOsmBase, RelationsMissing
-from opslib.osm.interfaces.kafka import KafkaClient
 from opslib.osm.interfaces.mongo import MongoClient
 from opslib.osm.interfaces.mysql import MysqlClient
 from opslib.osm.pod import (
@@ -87,6 +87,9 @@
 
 
 class PolCharm(CharmedOsmBase):
+
+    on = KafkaEvents()
+
     def __init__(self, *args) -> NoReturn:
         super().__init__(
             *args,
@@ -107,9 +110,9 @@
                     },
                 },
             )
-        self.kafka_client = KafkaClient(self, "kafka")
-        self.framework.observe(self.on["kafka"].relation_changed, self.configure_pod)
-        self.framework.observe(self.on["kafka"].relation_broken, self.configure_pod)
+        self.kafka = KafkaRequires(self)
+        self.framework.observe(self.on.kafka_available, self.configure_pod)
+        self.framework.observe(self.on.kafka_broken, self.configure_pod)
 
         self.mongodb_client = MongoClient(self, "mongodb")
         self.framework.observe(self.on["mongodb"].relation_changed, self.configure_pod)
@@ -122,10 +125,7 @@
     def _check_missing_dependencies(self, config: ConfigModel):
         missing_relations = []
 
-        if (
-            self.kafka_client.is_missing_data_in_unit()
-            and self.kafka_client.is_missing_data_in_app()
-        ):
+        if not self.kafka.host or not self.kafka.port:
             missing_relations.append("kafka")
         if not config.mongodb_uri and self.mongodb_client.is_missing_data_in_unit():
             missing_relations.append("mongodb")
@@ -185,8 +185,8 @@
                 "OSMPOL_GLOBAL_LOGLEVEL": config.log_level,
                 # Kafka configuration
                 "OSMPOL_MESSAGE_DRIVER": "kafka",
-                "OSMPOL_MESSAGE_HOST": self.kafka_client.host,
-                "OSMPOL_MESSAGE_PORT": self.kafka_client.port,
+                "OSMPOL_MESSAGE_HOST": self.kafka.host,
+                "OSMPOL_MESSAGE_PORT": self.kafka.port,
                 # Database configuration
                 "OSMPOL_DATABASE_DRIVER": "mongo",
             }
diff --git a/installers/charm/pol/tests/test_charm.py b/installers/charm/pol/tests/test_charm.py
index 330ecee..6cf435d 100644
--- a/installers/charm/pol/tests/test_charm.py
+++ b/installers/charm/pol/tests/test_charm.py
@@ -132,7 +132,7 @@
         kafka_relation_id = self.harness.add_relation("kafka", "kafka")
         self.harness.add_relation_unit(kafka_relation_id, "kafka/0")
         self.harness.update_relation_data(
-            kafka_relation_id, "kafka/0", {"host": "kafka", "port": 9092}
+            kafka_relation_id, "kafka", {"host": "kafka", "port": 9092}
         )
 
     def initialize_mongo_config(self):
diff --git a/installers/charm/pol/tox.ini b/installers/charm/pol/tox.ini
index 8e3318a..f3c9144 100644
--- a/installers/charm/pol/tox.ini
+++ b/installers/charm/pol/tox.ini
@@ -29,8 +29,10 @@
 
 [testenv]
 basepython = python3.8
-setenv = VIRTUAL_ENV={envdir}
-         PYTHONDONTWRITEBYTECODE = 1
+setenv =
+  VIRTUAL_ENV={envdir}
+  PYTHONPATH = {toxinidir}:{toxinidir}/lib:{toxinidir}/src
+  PYTHONDONTWRITEBYTECODE = 1
 deps =  -r{toxinidir}/requirements.txt
 
 
@@ -99,7 +101,7 @@
   charmcraft
   sh
 commands =
-  charmcraft build
+  charmcraft pack
   sh -c 'ubuntu_version=20.04; \
         architectures="amd64-aarch64-arm64"; \
         charm_name=`cat metadata.yaml | grep -E "^name: " | cut -f 2 -d " "`; \