diff --git a/weed/admin/task/master_sync.go b/weed/admin/task/master_sync.go
index 9abe33131..0ad454e18 100644
--- a/weed/admin/task/master_sync.go
+++ b/weed/admin/task/master_sync.go
@@ -4,11 +4,13 @@ import (
 	"context"
 	"fmt"
 	"strconv"
+	"strings"
 	"time"
 
 	"github.com/seaweedfs/seaweedfs/weed/glog"
 	"github.com/seaweedfs/seaweedfs/weed/pb/master_pb"
 	"github.com/seaweedfs/seaweedfs/weed/wdclient"
+	"github.com/seaweedfs/seaweedfs/weed/worker/tasks/erasure_coding"
 	"github.com/seaweedfs/seaweedfs/weed/worker/tasks/vacuum"
 	"github.com/seaweedfs/seaweedfs/weed/worker/types"
 )
@@ -267,41 +269,70 @@ func (ms *MasterSynchronizer) detectMaintenanceCandidates(data *master_pb.Volume
 	return candidates
 }
 
-// EC encoding criteria - using size limit from master
+// EC encoding criteria - using configuration from EC detector
 func (ms *MasterSynchronizer) checkECEncodingCandidate(volumeID uint32, state *VolumeState) *VolumeMaintenanceCandidate {
 	volume := state.CurrentState
 	if volume == nil {
 		return nil
 	}
 
-	// Skip EC encoding detection if no volume size limit is set from master
-	if ms.volumeSizeLimitMB <= 0 {
+	// Get the current configuration from the EC detector
+	ecDetector, _ := erasure_coding.GetSharedInstances()
+	if ecDetector == nil || !ecDetector.IsEnabled() {
 		return nil
 	}
 
+	// Get configuration values from the detector
+	fullnessThreshold := ecDetector.GetFullnessRatio()
+	quietForSeconds := ecDetector.GetQuietForSeconds()
+	collectionFilter := ecDetector.GetCollectionFilter()
+
 	// EC encoding criteria:
-	// 1. Volume is read-only or large enough
-	// 2. Not already EC encoded
-	// 3. Size threshold met
+	// 1. Volume meets fullness ratio threshold
+	// 2. Volume has been quiet for required duration
+	// 3. Collection filter matches (if specified)
+	// 4. Not already EC encoded
 
-	// Convert MB to bytes and use a fraction for EC threshold (e.g., 50% of size limit)
-	ecSizeThreshold := (ms.volumeSizeLimitMB * 1024 * 1024) / 2
-
-	// Check if volume is already EC encoded by checking if we have any EC shards for this volume
-	// For simplicity, assume no EC encoding for now since we don't have direct access to EC shard state
-	isCandidate := volume.Size > ecSizeThreshold &&
-		volume.Size > 1024*1024 // At least 1MB
-
-	if !isCandidate {
+	// Check fullness ratio (if we have size info)
+	if volume.Size == 0 {
 		return nil
 	}
 
+	// Calculate fullness ratio (assuming total capacity is close to actual size for near-full volumes)
+	// For a more accurate calculation, we'd need the volume's max capacity
+	fullnessRatio := float64(volume.Size-volume.DeletedByteCount) / float64(volume.Size)
+	if fullnessRatio < fullnessThreshold {
+		return nil
+	}
+
+	// Check collection filter if specified
+	if collectionFilter != "" {
+		// Parse comma-separated collections
+		allowedCollections := make(map[string]bool)
+		for _, collection := range strings.Split(collectionFilter, ",") {
+			allowedCollections[strings.TrimSpace(collection)] = true
+		}
+		// Skip if volume's collection is not in the allowed list
+		if !allowedCollections[volume.Collection] {
+			return nil
+		}
+	}
+
+	// Check quiet duration using volume's last modification time
+	now := time.Now()
+	lastModified := time.Unix(volume.ModifiedAtSecond, 0)
+	timeSinceModification := now.Sub(lastModified)
+
+	if timeSinceModification < time.Duration(quietForSeconds)*time.Second {
+		return nil // Volume hasn't been quiet long enough
+	}
+
 	return &VolumeMaintenanceCandidate{
 		VolumeID:   volumeID,
 		Server:     volume.Server,
 		TaskType:   "ec_encode",
-		Priority:   types.TaskPriorityNormal,
-		Reason:     fmt.Sprintf("Volume size %d bytes exceeds EC threshold %d", volume.Size, ecSizeThreshold),
+		Priority:   types.TaskPriorityLow, // EC is typically low priority
+		Reason:     fmt.Sprintf("Volume meets EC criteria: fullness=%.1f%% (>%.1f%%), quiet for %s (>%ds), collection='%s'", fullnessRatio*100, fullnessThreshold*100, timeSinceModification.Truncate(time.Second), quietForSeconds, volume.Collection),
 		VolumeInfo: volume,
 	}
 }