diff --git a/datagateway_api/src/search_api/query_filter_factory.py b/datagateway_api/src/search_api/query_filter_factory.py
index 0086b7d1..543afcad 100644
--- a/datagateway_api/src/search_api/query_filter_factory.py
+++ b/datagateway_api/src/search_api/query_filter_factory.py
@@ -1,10 +1,7 @@
-from datetime import datetime, timezone
 import logging
 
-from dateutil.relativedelta import relativedelta
 
 from datagateway_api.src.common.base_query_filter_factory import QueryFilterFactory
-from datagateway_api.src.common.config import Config
 from datagateway_api.src.common.exceptions import FilterError, SearchAPIError
 from datagateway_api.src.search_api.filters import (
     SearchAPIIncludeFilter,
@@ -300,14 +297,6 @@ def get_condition_values(conditions_dict):
                     "Bad Where filter: Invalid operator used with boolean value",
                 )
 
-        if field == "isPublic":
-            (
-                value,
-                operation,
-            ) = SearchAPIQueryFilterFactory.convert_is_public_field_value_and_operation(
-                value, operation,
-            )
-
         return field, value, operation
 
     @staticmethod
@@ -344,36 +333,3 @@ def prefix_where_filter_field_with_entity_name(where_filters, entity_name):
                     )
             if isinstance(where_filter, SearchAPIWhereFilter):
                 where_filter.field = f"{entity_name}.{where_filter.field}"
-
-    @staticmethod
-    def convert_is_public_field_value_and_operation(value, operation):
-        """
-        The ICAT mappings for the isPublic PaNOSC fields are not direct and as a result
-        of this, we calculate whether data is public or not at the Search API level.
-        For example, in the case of ISIS, Dataset's isPublic field maps to Dataset's
-        createTime field in ICAT. We take this datetime value and determine whether it
-        is public or not by checking whether the datetime is more than 3 years ago or
-        not. The isPublic fields are of type boolean so any WHERE filter applied to
-        them will have a value that is boolean too. As a result of this, the value and
-        operation need to be converted to a format appropriate for the mapped ICAT
-        field. In the example above, if the filter asks for all Datasets whose isPublic
-        fields are set to True to be returned, then this method changes the WHERE
-        filter value to a three years ago datetime value and the operator to less than
-        so that all Datasets older than 3 years (which ISIS considers public) are
-        returned.
-        """
-        value = not value if operation == "neq" else value
-        if value is True:
-            operation = "lt"
-        else:
-            operation = "gt"
-
-        current_datetime = datetime.now(timezone.utc)
-        rd = relativedelta(
-            years=Config.config.search_api.num_of_years_determining_public_data,
-        )
-        # The timezone part has a plus sign so replacing
-        # with a blank space to avoid issues
-        value = str(current_datetime - rd).replace("+", " ")
-
-        return value, operation