diff --git a/schemes/utilities/clamp_number_concentrations.F90 b/schemes/utilities/clamp_number_concentrations.F90
index 62e8e507..84985158 100644
--- a/schemes/utilities/clamp_number_concentrations.F90
+++ b/schemes/utilities/clamp_number_concentrations.F90
@@ -40,21 +40,15 @@ module clamp_number_concentrations
 
 !> \section arg_table_clamp_number_concentrations_init Argument Table
 !! \htmlinclude clamp_number_concentrations_init.html
-  subroutine clamp_number_concentrations_init(const_props, errmsg, errflg)
+  subroutine clamp_number_concentrations_init(errmsg, errflg)
+    use ccpp_scheme_utils, only: ccpp_constituent_index
 
-    use ccpp_constituent_prop_mod, only: ccpp_constituent_prop_ptr_t
-    use ccpp_const_utils,          only: ccpp_const_get_idx
-
-    type(ccpp_constituent_prop_ptr_t), &
-                        intent(in)  :: const_props(:)
-    character(len=512), intent(out) :: errmsg
-    integer,            intent(out) :: errflg
+    character(len=*), intent(out) :: errmsg
+    integer,          intent(out) :: errflg
 
     ! Local variables
     integer :: ix_species(num_species)
     integer :: n
-    character(len=512) :: local_errmsg
-    integer            :: local_errflg
 
     errmsg = ''
     errflg = 0
@@ -62,13 +56,11 @@ subroutine clamp_number_concentrations_init(const_props, errmsg, errflg)
     ix_species(:) = -1
     ! Look up constituent indices. A missing species is skipped
     do n = 1, num_species
-      call ccpp_const_get_idx(const_props, trim(std_names(n)), &
-                              ix_species(n), local_errmsg, local_errflg)
-      if (local_errflg /= 0) then
-        ! Constituent not found — mark as inactive, reset error
+      call ccpp_constituent_index(trim(std_names(n)), ix_species(n), errmsg=errmsg, errcode=errflg)
+      if(errflg /= 0) return
+      if (ix_species(n) < 0) then
+        ! Constituent not found — mark as inactive
         ix_species(n) = -1
-        local_errflg  = 0
-        local_errmsg  = ''
       end if
     end do
 
@@ -83,16 +75,15 @@ end subroutine clamp_number_concentrations_init
 !> \section arg_table_clamp_number_concentrations_run Argument Table
 !! \htmlinclude clamp_number_concentrations_run.html
   subroutine clamp_number_concentrations_run( &
-    ncol, pver, dt, &
+    ncol, pver, &
     const_q, const_tend, &
     errmsg, errflg)
 
     integer,            intent(in)    :: ncol
     integer,            intent(in)    :: pver
-    real(kind_phys),    intent(in)    :: dt                  ! physics timestep [s]
     real(kind_phys),    intent(inout) :: const_q(:, :, :)    ! constituent mixing ratios
     real(kind_phys),    intent(inout) :: const_tend(:, :, :) ! constituent tendencies
-    character(len=512), intent(out)   :: errmsg
+    character(len=*),   intent(out)   :: errmsg
     integer,            intent(out)   :: errflg
 
     ! Local variables
diff --git a/schemes/utilities/clamp_number_concentrations.meta b/schemes/utilities/clamp_number_concentrations.meta
index 33eb91a9..e1d5c486 100644
--- a/schemes/utilities/clamp_number_concentrations.meta
+++ b/schemes/utilities/clamp_number_concentrations.meta
@@ -5,16 +5,10 @@
 [ccpp-arg-table]
   name  = clamp_number_concentrations_init
   type  = scheme
-[ const_props ]
-  standard_name = ccpp_constituent_properties
-  units = none
-  type = ccpp_constituent_prop_ptr_t
-  dimensions = (number_of_ccpp_constituents)
-  intent = in
 [ errmsg ]
   standard_name = ccpp_error_message
   units = none
-  type = character | kind = len=512
+  type = character | kind = len=*
   dimensions = ()
   intent = out
 [ errflg ]
@@ -39,12 +33,6 @@
   type = integer
   dimensions = ()
   intent = in
-[ dt ]
-  standard_name = timestep_for_physics
-  units = s
-  type = real | kind = kind_phys
-  dimensions = ()
-  intent = in
 [ const_q ]
   standard_name = ccpp_constituents
   units = none
@@ -60,7 +48,7 @@
 [ errmsg ]
   standard_name = ccpp_error_message
   units = none
-  type = character | kind = len=512
+  type = character | kind = len=*
   dimensions = ()
   intent = out
 [ errflg ]