diff --git a/cmd/synchronizer/flag_set_validation_error_test.go b/cmd/synchronizer/flag_set_validation_error_test.go
new file mode 100644
index 00000000..54de97f7
--- /dev/null
+++ b/cmd/synchronizer/flag_set_validation_error_test.go
@@ -0,0 +1,30 @@
+package main
+
+import (
+	"fmt"
+	"github.com/splitio/go-split-commons/v5/flagsets"
+	"golang.org/x/exp/slices"
+	"strings"
+	"testing"
+)
+
+func TestFlagSetValidationError(t *testing.T) {
+	flagSets, err := flagsets.SanitizeMany([]string{"Flagset1", " flagset2 ", "123#@flagset"})
+	if err == nil {
+		t.Error("errors should not be nil")
+	}
+	if len(err) != 3 {
+		t.Error("Unexpected Amount of errors. Should be 3. Was", len(err))
+	}
+	if len(flagSets) != 2 {
+		t.Error("Unexpected amount of flagsets. Should be 2. Was", len(flagSets))
+	}
+	if !slices.Contains(flagSets, "flagset1") || !slices.Contains(flagSets, "flagset2") {
+		t.Error("Missing flagsets.")
+	}
+	fsvError := flagSetValidationError{wrapped: err}.Error()
+	if !strings.Contains(fsvError, "Flagset1") || !strings.Contains(fsvError, "flagset2") || !strings.Contains(fsvError, "123#@flagset") {
+		t.Error("Missing errors on flagSetValidation.")
+	}
+	fmt.Printf("Flagsets: %#v", flagSets)
+}
diff --git a/cmd/synchronizer/main.go b/cmd/synchronizer/main.go
index a19742ec..07c56efa 100644
--- a/cmd/synchronizer/main.go
+++ b/cmd/synchronizer/main.go
@@ -3,7 +3,9 @@ package main
 import (
 	"errors"
 	"fmt"
+	"github.com/splitio/go-split-commons/v5/flagsets"
 	"os"
+	"strings"
 
 	"github.com/splitio/split-synchronizer/v5/splitio"
 	"github.com/splitio/split-synchronizer/v5/splitio/common"
@@ -22,6 +24,18 @@ func parseCliArgs() *cconf.CliFlags {
 	return cconf.ParseCliArgs(&conf.Main{})
 }
 
+type flagSetValidationError struct {
+	wrapped []error
+}
+
+func (f flagSetValidationError) Error() string {
+	var errors []string
+	for _, err := range f.wrapped {
+		errors = append(errors, err.Error())
+	}
+	return strings.Join(errors, ".|| ")
+}
+
 func setupConfig(cliArgs *cconf.CliFlags) (*conf.Main, error) {
 	syncConf := conf.Main{}
 	cconf.PopulateDefaults(&syncConf)
@@ -34,7 +48,16 @@ func setupConfig(cliArgs *cconf.CliFlags) (*conf.Main, error) {
 	}
 
 	cconf.PopulateFromArguments(&syncConf, cliArgs.RawConfig)
-	return &syncConf, nil
+
+	var err error
+	sanitizedFlagSets, fsErr := flagsets.SanitizeMany(syncConf.FlagSetsFilter)
+	if fsErr != nil {
+		err = flagSetValidationError{wrapped: fsErr}
+	}
+	if sanitizedFlagSets != nil {
+		syncConf.FlagSetsFilter = sanitizedFlagSets
+	}
+	return &syncConf, err
 }
 
 func main() {
@@ -57,8 +80,13 @@ func main() {
 
 	cfg, err := setupConfig(cliArgs)
 	if err != nil {
-		fmt.Println("error processing config: ", err)
-		os.Exit(exitCodeConfigError)
+		var fsErr flagSetValidationError
+		if errors.As(err, &fsErr) {
+			fmt.Println("error processing flagset: ", err.Error())
+		} else {
+			fmt.Println("error processing config: ", err)
+			os.Exit(exitCodeConfigError)
+		}
 	}
 
 	logger := log.BuildFromConfig(&cfg.Logging, "Split-Sync", &cfg.Integrations.Slack)
diff --git a/splitio/producer/initialization_test.go b/splitio/producer/initialization_test.go
index d03c6e22..df7f58c3 100644
--- a/splitio/producer/initialization_test.go
+++ b/splitio/producer/initialization_test.go
@@ -6,6 +6,8 @@ import (
 	"net/http"
 	"net/http/httptest"
 	"os"
+	"strconv"
+	"strings"
 	"testing"
 
 	config "github.com/splitio/go-split-commons/v5/conf"
@@ -198,6 +200,58 @@ func TestSanitizeRedisWithRedisDifferentApiKey(t *testing.T) {
 	redisClient.Del("SPLITIO.test1")
 }
 
+func TestSanitizeRedisWithForcedCleanupByFlagSets(t *testing.T) {
+	cfg := getDefaultConf()
+	cfg.Apikey = "983564etyrudhijfgknf9i08euh"
+	cfg.Initialization.ForceFreshStartup = true
+	cfg.FlagSetsFilter = []string{"flagset1", "flagset2"}
+
+	hash := util.HashAPIKey(cfg.Apikey + strings.Join(cfg.FlagSetsFilter, "::"))
+
+	logger := logging.NewLogger(nil)
+
+	redisClient, err := predis.NewRedisClient(&config.RedisConfig{
+		Host:     "localhost",
+		Port:     6379,
+		Prefix:   "some_prefix",
+		Database: 1,
+	}, logger)
+	if err != nil {
+		t.Error("It should be nil")
+	}
+
+	err = redisClient.Set("SPLITIO.test1", "123", 0)
+	redisClient.Set("SPLITIO.hash", hash, 0)
+	if err != nil {
+		t.Error("It should be nil")
+	}
+	value, err := redisClient.Get("SPLITIO.test1")
+	if value != "123" {
+		t.Error("Value should have been set properly")
+	}
+
+	cfg.FlagSetsFilter = []string{"flagset7"}
+	miscStorage := predis.NewMiscStorage(redisClient, logger)
+	value, err = redisClient.Get("SPLITIO.test1")
+	err = sanitizeRedis(cfg, miscStorage, logger)
+	if err != nil {
+		t.Error("It should be nil", err)
+	}
+
+	value, _ = redisClient.Get("SPLITIO.test1")
+	if value != "" {
+		t.Error("Value should have been removed.")
+	}
+
+	val, _ := redisClient.Get("SPLITIO.hash")
+	parsedHash, _ := strconv.ParseUint(val, 10, 64)
+	if uint32(parsedHash) == hash {
+		t.Error("ApiHash should have been updated.")
+	}
+	redisClient.Del("SPLITIO.hash")
+	redisClient.Del("SPLITIO.test1")
+}
+
 func getDefaultConf() *conf.Main {
 	var c conf.Main
 	cconf.PopulateDefaults(&c)
diff --git a/splitio/producer/util.go b/splitio/producer/util.go
index c0f24f69..f7cda7f2 100644
--- a/splitio/producer/util.go
+++ b/splitio/producer/util.go
@@ -124,7 +124,7 @@ func sanitizeRedis(cfg *conf.Main, miscStorage *redis.MiscStorage, logger loggin
 	if miscStorage == nil {
 		return errors.New("Could not sanitize redis")
 	}
-	currentHash := util.HashAPIKey(cfg.Apikey)
+	currentHash := util.HashAPIKey(cfg.Apikey + strings.Join(cfg.FlagSetsFilter, "::"))
 	currentHashAsStr := strconv.Itoa(int(currentHash))
 	defer miscStorage.SetApikeyHash(currentHashAsStr)