====== Layered navigation ======
Required attribute conditions to be shown on layered navigation filters:

  * Attribute properties / Catalog Input Type for Store Owner = Dropdown or Multiple Select (or the System Attribute, Price)
  * Frontend properties / Use In Layered Navigation = Filtered *
  * System properties / Data Type for Saving in Database = Integer
  * System properties / Globally Editable = Yes 

Please note that a category should have the 'Is Anchor' property set to Yes in order for the layered navigation block to show.