diff --git a/netforce_clinic/layouts/clinic_hd_case_dlz_form.xml b/netforce_clinic/layouts/clinic_hd_case_dlz_form.xml
index 83203c1..810ae6a 100644
--- a/netforce_clinic/layouts/clinic_hd_case_dlz_form.xml
+++ b/netforce_clinic/layouts/clinic_hd_case_dlz_form.xml
@@ -6,6 +6,7 @@
     <field name="membrane_type" required="1" span="6"/>
     <field name="exp_date" span="6"/>
     <field name="note" span="6"/>
+    <field name="drop_old" span="6"/>
     <foot>
         <button string="Validate" type="success" method="new_dlz"/>
     </foot>
diff --git a/netforce_clinic/layouts/clinic_hd_case_form.xml b/netforce_clinic/layouts/clinic_hd_case_form.xml
index 3dde598..6587a9b 100644
--- a/netforce_clinic/layouts/clinic_hd_case_form.xml
+++ b/netforce_clinic/layouts/clinic_hd_case_form.xml
@@ -56,6 +56,7 @@
                         <field name="use_time"/>
                         <field name="max_use_time"/>
                         <field name="description"/>
+                        <field name="state"/>
                     </list>
                 </field>
                 <field name="note"/>
diff --git a/netforce_clinic/models/hd_case.py b/netforce_clinic/models/hd_case.py
index 16c7a99..2c9b7c3 100644
--- a/netforce_clinic/models/hd_case.py
+++ b/netforce_clinic/models/hd_case.py
@@ -1305,7 +1305,20 @@ class HDCase(Model):
         }
 
     def new_dialyzer(self,ids,context={}):
+        '''
+            drop old one and create new dlz
+        '''
         obj=self.browse(ids)[0]
+        if context.get('drop_old'):
+            for dlz_line in obj.dialyzers:
+                dlz=dlz_line.dialyzer_id
+                dlz_line.write({
+                    'use_time': dlz.use_time,
+                })
+                dlz.write({
+                    'state': 'drop',
+                })
+
         is_wiz=context.get("is_wiz")
         dlz_vals={}
         if is_wiz:
diff --git a/netforce_clinic/models/hd_case_dialyzer.py b/netforce_clinic/models/hd_case_dialyzer.py
index 7adfee1..e58fcf5 100644
--- a/netforce_clinic/models/hd_case_dialyzer.py
+++ b/netforce_clinic/models/hd_case_dialyzer.py
@@ -14,6 +14,13 @@ class HDCaseDialyzerLine(Model):
             }
         return res
 
+    def _get_dlz_state(self,ids,context={}):
+        res={}
+        for obj in self.browse(ids):
+            dlz=obj.dialyzer_id
+            res[obj.id]=dlz.state
+        return res
+
     _fields={
         "hd_case_id": fields.Many2One("clinic.hd.case","HDCase",on_delete="cascade"),
         "dialyzer_type": fields.Selection([("low","low flux"),("high","high flux"),("dbl","dbl hifulx")],"Dialyzer Type"),
@@ -25,6 +32,7 @@ class HDCaseDialyzerLine(Model):
         'hdcase_date': fields.Date('Date', function="_get_all",function_multi=True),
         "hdcase_state": fields.Selection([("draft","Draft"),('waiting_treatment','Waiting Treatment'),("in_progress","In Progress"),("completed","Finish Treatment"),('paid','Paid'),("waiting_payment","Waiting Payment"),("discountinued","Discountinued"),("cancelled","Cancelled")],"Status",required=True,function="_get_all",function_multi=True),
         'nurse_id': fields.Many2One('clinic.staff', 'Nurse',function="_get_all",function_multi=True),
+        "state": fields.Selection([("new","New"),("active","Active"),("drop","Drop"),("expire","Expire"),('cancelled','Cancelled')],"Status",function="_get_dlz_state"),
     }
 
     _order="hd_case_id.date desc"
diff --git a/netforce_clinic/models/hd_case_popup_dlz.py b/netforce_clinic/models/hd_case_popup_dlz.py
index 74765c5..a4e9a41 100644
--- a/netforce_clinic/models/hd_case_popup_dlz.py
+++ b/netforce_clinic/models/hd_case_popup_dlz.py
@@ -12,6 +12,7 @@ class HDCasePopupDlz(Model):
         "exp_date": fields.Date("Expiry Date"),
         "note": fields.Text("Note"),
         "membrane_type": fields.Selection([("unsub","Unsub cellul"),("sub","Sub cellul"),("synthetic","Synthetic")],"Membrane Type"),
+        'drop_old': fields.Boolean("Drop Old Dialyzer"),
     }
     
     def __get_hd_case_id(self,context={}):
@@ -45,6 +46,7 @@ class HDCasePopupDlz(Model):
             'membrane_type': membrane_type,
             'max_use_time': max_use_time,
             'product_id': product_id,
+            'drop_old': True,
         }
         print('res', res)
         return res
@@ -56,6 +58,7 @@ class HDCasePopupDlz(Model):
         if hd_case:
             context['is_wiz']=True
             context['pop_id']=obj.id
+            context['drop_old']=obj.drop_old
             res=hd_case.new_dialyzer(context=context)
         print('res ', res)
         return res