diff --git a/api/filters.go b/api/filters.go
index 4380ad2c..48e73ed0 100644
--- a/api/filters.go
+++ b/api/filters.go
@@ -479,6 +479,10 @@ func (api *FilterAPI) getDimensionOptionsBatchProcess(ctx context.Context, dimen
 		return nil
 	}
 
+	// get encoded IDs so that they can be used as query paramters
+	encodedIDs := dimension.EncodedOptions()
+
+	// validate the options with Dataset API, in batches
 	err := api.datasetAPI.GetOptionsBatchProcess(ctx,
 		getUserAuthToken(ctx),
 		api.serviceAuthToken,
@@ -487,7 +491,7 @@ func (api *FilterAPI) getDimensionOptionsBatchProcess(ctx context.Context, dimen
 		dataset.Edition,
 		strconv.Itoa(dataset.Version),
 		dimension.Name,
-		&dimension.Options,
+		&encodedIDs,
 		processBatch,
 		api.maxDatasetOptions,
 		api.BatchMaxWorkers)
diff --git a/go.mod b/go.mod
index 864aac10..2f08af7d 100644
--- a/go.mod
+++ b/go.mod
@@ -3,7 +3,7 @@ module github.com/ONSdigital/dp-filter-api
 go 1.15
 
 require (
-	github.com/ONSdigital/dp-api-clients-go v1.32.6
+	github.com/ONSdigital/dp-api-clients-go v1.32.10
 	github.com/ONSdigital/dp-graph/v2 v2.3.0
 	github.com/ONSdigital/dp-healthcheck v1.0.5
 	github.com/ONSdigital/dp-kafka/v2 v2.1.2
diff --git a/go.sum b/go.sum
index 3ae24149..c6f64616 100644
--- a/go.sum
+++ b/go.sum
@@ -1,7 +1,7 @@
 github.com/ONSdigital/dp-api-clients-go v1.1.0/go.mod h1:9lqor0I7caCnRWr04gU/r7x5dqxgoODob8L48q+cE4E=
 github.com/ONSdigital/dp-api-clients-go v1.28.0/go.mod h1:iyJy6uRL4B6OYOJA0XMr5UHt6+Q8XmN9uwmURO+9Oj4=
-github.com/ONSdigital/dp-api-clients-go v1.32.6 h1:jLAhlSAFx8iV9P9K5TBEkzQMnl3gxAT5IzvyKSE3tQ0=
-github.com/ONSdigital/dp-api-clients-go v1.32.6/go.mod h1:0pUK3MN1v7DTjq0JSAD+DqbsZ8AVTodrXSXgJecg9Pw=
+github.com/ONSdigital/dp-api-clients-go v1.32.10 h1:oH3+9PHPn4EFr/m4tEdLi/yW1W6vu5t+gNE8qPzr0lM=
+github.com/ONSdigital/dp-api-clients-go v1.32.10/go.mod h1:0pUK3MN1v7DTjq0JSAD+DqbsZ8AVTodrXSXgJecg9Pw=
 github.com/ONSdigital/dp-frontend-models v1.1.0/go.mod h1:TT96P7Mi69N3Tc/jFNdbjiwG4GAaMjP26HLotFQ6BPw=
 github.com/ONSdigital/dp-graph/v2 v2.3.0 h1:xK9qImVbh86l04aAUeurjB7d8mwn27eacP+5gpvPLO8=
 github.com/ONSdigital/dp-graph/v2 v2.3.0/go.mod h1:K4LIhFcyxB8g7nUG5I5I8x6QVf89x82dCEFBbE0mmaQ=
diff --git a/models/models.go b/models/models.go
index a8e8e514..a767e4fa 100644
--- a/models/models.go
+++ b/models/models.go
@@ -6,6 +6,7 @@ import (
 	"fmt"
 	"io"
 	"io/ioutil"
+	"net/url"
 	"time"
 
 	"github.com/ONSdigital/dp-api-clients-go/dataset"
@@ -75,6 +76,15 @@ type Dimension struct {
 	Options []string `bson:"options"                 json:"options"`
 }
 
+// EncodedOptions returns the list of options for this dimension after escaping the values for URL query paramters
+func (d *Dimension) EncodedOptions() []string {
+	encodedIDs := make([]string, len(d.Options))
+	for i, op := range d.Options {
+		encodedIDs[i] = url.QueryEscape(op)
+	}
+	return encodedIDs
+}
+
 // PublicDimension represents information about a single dimension as served by /dimensions and /dimensions/<id>
 type PublicDimension struct {
 	Name  string                  `bson:"name"                    json:"name"`