diff --git a/smarttub/api.py b/smarttub/api.py
index c31c9c4..46ba5cd 100644
--- a/smarttub/api.py
+++ b/smarttub/api.py
@@ -437,7 +437,7 @@ def __init__(self, spa: Spa, **properties):
 
 
 class SpaPrimaryFiltrationCycle(SpaState):
-    PrimaryFiltrationMode = Enum("PrimaryFiltrationMode", "NORMAL NANO_MODE")
+    PrimaryFiltrationMode = Enum("PrimaryFiltrationMode", "NORMAL NANO_MODE ECO_MODE")
 
     def __init__(self, spa: Spa, **properties):
         self.spa = spa