diff --git a/src/Entity/Facet.php b/src/Entity/Facet.php
index 889a074..3c6e1ce 100644
--- a/src/Entity/Facet.php
+++ b/src/Entity/Facet.php
@@ -215,13 +215,19 @@ class Facet extends ConfigEntityBase implements FacetInterface {
   /**
    * {@inheritdoc}
    */
-  public function getDescription() {
-    return $this->description;
+  protected function urlRouteParameters($rel) {
+    $parameters = parent::urlRouteParameters($rel);
+    return $parameters;
   }
 
   /**
    * {@inheritdoc}
    */
+  public function getDescription() {
+    return $this->description;
+  }  /**
+   * {@inheritdoc}
+   */
   public function setWidget($widget) {
     $this->widget = $widget;
     return $this;
@@ -230,11 +236,49 @@ class Facet extends ConfigEntityBase implements FacetInterface {
   /**
    * {@inheritdoc}
    */
+  public function getQueryTypes() {
+    return $this->query_type_name;
+  }  /**
+   * {@inheritdoc}
+   */
   public function getWidget() {
     return $this->widget;
   }
 
   /**
+   * Retrieves all processors supported by this facet.
+   *
+   * @return \Drupal\facets\Processor\ProcessorInterface[]
+   *   The loaded processors, keyed by processor ID.
+   */
+  protected function loadProcessors() {
+    if (!isset($this->processors)) {
+      /* @var $processor_plugin_manager \Drupal\facets\Processor\ProcessorPluginManager */
+      $processor_plugin_manager = \Drupal::service('plugin.manager.facets.processor');
+      $processor_settings = $this->getOption('processors', []);
+
+      foreach ($processor_plugin_manager->getDefinitions() as $name => $processor_definition) {
+        if (class_exists($processor_definition['class']) && empty($this->processors[$name])) {
+          // Create our settings for this processor.
+          $settings = empty($processor_settings[$name]['settings']) ? [] : $processor_settings[$name]['settings'];
+          $settings['facet'] = $this;
+
+          /* @var $processor \Drupal\facets\Processor\ProcessorInterface */
+          $processor = $processor_plugin_manager->createInstance($name, $settings);
+          $this->processors[$name] = $processor;
+        }
+        elseif (!class_exists($processor_definition['class'])) {
+          \Drupal::logger('facets')
+            ->warning('Processor @id specifies a non-existing @class.', array(
+              '@id' => $name,
+              '@class' => $processor_definition['class']
+            ));
+        }
+      }
+    }
+
+    return $this->processors;
+  }  /**
    * {@inheritdoc}
    */
   public function getQueryType() {
@@ -252,6 +296,13 @@ class Facet extends ConfigEntityBase implements FacetInterface {
   /**
    * {@inheritdoc}
    */
+  public function getQueryOperator() {
+    return $this->getOption('query_operator', 'OR');
+  }
+
+  /**
+   * {@inheritdoc}
+   */
   public function getFieldAlias() {
     // For now, create the field alias based on the field identifier.
     $field_alias = preg_replace('/[:\/]+/', '_', $this->field_identifier);
@@ -319,12 +370,7 @@ class Facet extends ConfigEntityBase implements FacetInterface {
     return $this;
   }
 
-  /**
-   * {@inheritdoc}
-   */
-  public function getQueryTypes() {
-    return $this->query_type_name;
-  }
+
 
   /**
    * {@inheritdoc}
@@ -370,44 +416,9 @@ class Facet extends ConfigEntityBase implements FacetInterface {
     return $this->facet_source_id;
   }
 
-  /**
-   * Retrieves all processors supported by this facet.
-   *
-   * @return \Drupal\facets\Processor\ProcessorInterface[]
-   *   The loaded processors, keyed by processor ID.
-   */
-  protected function loadProcessors() {
-    if (!isset($this->processors)) {
-      /* @var $processor_plugin_manager \Drupal\facets\Processor\ProcessorPluginManager */
-      $processor_plugin_manager = \Drupal::service('plugin.manager.facets.processor');
-      $processor_settings = $this->getOption('processors', []);
 
-      foreach ($processor_plugin_manager->getDefinitions() as $name => $processor_definition) {
-        if (class_exists($processor_definition['class']) && empty($this->processors[$name])) {
-          // Create our settings for this processor.
-          $settings = empty($processor_settings[$name]['settings']) ? [] : $processor_settings[$name]['settings'];
-          $settings['facet'] = $this;
 
-          /* @var $processor \Drupal\facets\Processor\ProcessorInterface */
-          $processor = $processor_plugin_manager->createInstance($name, $settings);
-          $this->processors[$name] = $processor;
-        }
-        elseif (!class_exists($processor_definition['class'])) {
-          \Drupal::logger('facets')->warning('Processor @id specifies a non-existing @class.', array('@id' => $name, '@class' => $processor_definition['class']));
-        }
-      }
-    }
 
-    return $this->processors;
-  }
-
-  /**
-   * {@inheritdoc}
-   */
-  protected function urlRouteParameters($rel) {
-    $parameters = parent::urlRouteParameters($rel);
-    return $parameters;
-  }
 
   /**
    * {@inheritdoc}
@@ -463,7 +474,11 @@ class Facet extends ConfigEntityBase implements FacetInterface {
           $this->facetSourcePlugins[$name] = $facet_source;
         }
         elseif (!class_exists($facet_source_definition['class'])) {
-          \Drupal::logger('facets')->warning('Facet Source @id specifies a non-existing @class.', ['@id' => $name, '@class' => $facet_source_definition['class']]);
+          \Drupal::logger('facets')
+            ->warning('Facet Source @id specifies a non-existing @class.', [
+              '@id' => $name,
+              '@class' => $facet_source_definition['class']
+            ]);
         }
       }
     }
diff --git a/src/FacetInterface.php b/src/FacetInterface.php
index 7e39f2a..fdbdc80 100644
--- a/src/FacetInterface.php
+++ b/src/FacetInterface.php
@@ -122,6 +122,14 @@ interface FacetInterface extends ConfigEntityInterface {
   public function getQueryType();
 
   /**
+   * Get the query operator.
+   *
+   * @return string
+   *   The query operator being used.
+   */
+  public function getQueryOperator();
+
+  /**
    * Get the plugin name for the url processor.
    *
    * @return string
diff --git a/src/Form/FacetDisplayForm.php b/src/Form/FacetDisplayForm.php
index d55dfe1..a138309 100644
--- a/src/Form/FacetDisplayForm.php
+++ b/src/Form/FacetDisplayForm.php
@@ -352,6 +352,15 @@ class FacetDisplayForm extends EntityForm {
       '#default_value' => isset($empty_behavior_config['text_format']) ? $empty_behavior_config['text'] : '',
     ];
 
+    // Query operator.
+    $form['facet_settings']['query_operator'] = [
+      '#type' => 'radios',
+      '#title' => $this->t('Operator'),
+      '#options' => ['OR' => $this->t('OR'), 'AND' => $this->t('AND')],
+      '#description' => $this->t('AND filters are exclusive and narrow the result set. OR filters are inclusive and widen the result set.'),
+      '#default_value' => $facet->getQueryOperator(),
+    ];
+
     $form['weights'] = array(
       '#type' => 'details',
       '#title' => t('Advanced settings'),
@@ -529,6 +538,8 @@ class FacetDisplayForm extends EntityForm {
     }
     $facet->setOption('empty_behavior', $empty_behavior_config);
 
+    $facet->setOption('query_operator', $form_state->getValue(['facet_settings', 'query_operator']));
+
     $facet->save();
     drupal_set_message(t('Facet %name has been updated.', ['%name' => $facet->getName()]));
   }
diff --git a/src/Plugin/facets/query_type/SearchApiString.php b/src/Plugin/facets/query_type/SearchApiString.php
index c44d0bb..fab8010 100644
--- a/src/Plugin/facets/query_type/SearchApiString.php
+++ b/src/Plugin/facets/query_type/SearchApiString.php
@@ -44,6 +44,7 @@ class SearchApiString extends QueryTypePluginBase {
     // Alter the query here.
     if (!empty($query)) {
       $options = &$query->getOptions();
+      $operator = $this->facet->getQueryOperator();
 
       $field_identifier = $this->facet->getFieldIdentifier();
       $options['search_api_facets'][$field_identifier] = array(
@@ -56,12 +57,13 @@ class SearchApiString extends QueryTypePluginBase {
 
       // Add the filter to the query if there are active values.
       $active_items = $this->facet->getActiveItems();
+
       if (count($active_items)) {
+        $filter = $query->createConditionGroup($operator);
         foreach ($active_items as $value) {
-          $filter = $query->createConditionGroup();
           $filter->addCondition($this->facet->getFieldIdentifier(), $value);
-          $query->addConditionGroup($filter);
         }
+        $query->addConditionGroup($filter);
       }
     }
   }