diff --git a/src/MNH/anel_balancen.f90 b/src/MNH/anel_balancen.f90
index 1c14b8262a04b0ce8a674d1b5262882d6a9264b1..a0ed07162cfa75de94cc3ad5755d6ac8fe53a9df 100644
--- a/src/MNH/anel_balancen.f90
+++ b/src/MNH/anel_balancen.f90
@@ -301,15 +301,7 @@ CALL PRESSUREZ(CLBCX,CLBCY,CPRESOPT,NITR,LITRADJ,ITCOUNT,XRELAX,IMI,  &
                IRR,IRRL,IRRI,ZDRYMASST,ZREFMASS,ZMASS_O_PHI0,         &
                ZTH,ZRR,XRHODREF,XTHVREF,XRVREF,XEXNREF, XLINMASS,     &
                ZRU,ZRV,ZRW,ZPABST,                                    &
-#ifndef MNH_MGSOLVER
                ZBFB,ZBF_SXP2_YP1_Z,PRESIDUAL                          )
-#else
-               ZBFB,ZBF_SXP2_YP1_Z,                                   &
-               XAF_ZS,XBF_ZS,XCF_ZS,                                  &
-               XDXATH_ZS,XDYATH_ZS,XRHO_ZS,                           &
-               XA_K,XB_K,XC_K,XD_K,                                   &
-               PRESIDUAL                          )
-#endif
 !
 CALL MPPDB_CHECK3D(XRHODJ,"anel_balancen3.2-after pressurez halo::XRHODJ",PRECISION)
 CALL MPPDB_CHECK3D(ZRU,"anel_balancen3.2-after pressurez::ZRU",PRECISION)
diff --git a/src/MNH/modeln.f90 b/src/MNH/modeln.f90
index b68f05803e53763615a8c37fafdcaa6371ef33ef..e8530e4bc222b3e1677c0fc078c9a9fc88b6d2e1 100644
--- a/src/MNH/modeln.f90
+++ b/src/MNH/modeln.f90
@@ -1865,14 +1865,7 @@ IF(.NOT. L1D) THEN
                   XTHT,XRT,XRHODREF,XTHVREF,XRVREF,XEXNREF, XLINMASS,    &
                   XRUS, XRVS, XRWS, XPABST,                              &
                   XBFB,                                                  &
-#ifndef MNH_MGSOLVER
                   XBF_SXP2_YP1_Z) !JUAN Z_SPLITING
-#else
-                  XBF_SXP2_YP1_Z,                                        &
-                  XAF_ZS,XBF_ZS,XCF_ZS,                                  &
-                  XDXATH_ZS,XDYATH_ZS,XRHO_ZS,                           &
-                  XA_K,XB_K,XC_K,XD_K) !JUAN FULL ZSOLVER
-#endif
 !$acc end data
 !$acc update self( XRUS, XRVS, XRWS, XPABST )
 !
diff --git a/src/MNH/pressurez.f90 b/src/MNH/pressurez.f90
index 1fe82d747d9c4653b3a2da1665e8444bc7b6a0e3..74f6fec9ae52c0a9132d856c70f7fa100a87ed20 100644
--- a/src/MNH/pressurez.f90
+++ b/src/MNH/pressurez.f90
@@ -18,11 +18,6 @@ INTERFACE
       PRUS,PRVS,PRWS,PPABST,                                               &
       PBFB,                                                                &
       PBF_SXP2_YP1_Z,                                                      &
-#ifdef MNH_MGSOLVER
-      PAF_ZS,PBF_ZS,PCF_ZS,                                                &
-      PDXATH_ZS,PDYATH_ZS,PRHO_ZS,                                         &
-      A_K,B_K,C_K,D_K,                                                     &
-#endif
       PRESIDUAL                                           ) !JUAN Z_SPLITING
 !
 IMPLICIT NONE
@@ -102,12 +97,6 @@ REAL, DIMENSION(:,:,:), INTENT(IN) :: PBFB       ! elements of the tri-diag b-sl
                                                  ! matrix in the pressure eq.
 REAL, DIMENSION(:,:,:), INTENT(IN) :: PBF_SXP2_YP1_Z       ! elements of the tri-diag. SXP2_YP1_Z-slide 
                                                    ! matrix in the pressure eq.
-#ifdef MNH_MGSOLVER
-REAL, DIMENSION(:,:,:), INTENT(IN) :: PAF_ZS,PBF_ZS,PCF_ZS
-REAL, DIMENSION(:,:)  , INTENT(IN) :: PDXATH_ZS,PDYATH_ZS
-REAL, DIMENSION(:,:,:), INTENT(IN) :: PRHO_ZS
-REAL, DIMENSION(:)    , INTENT(IN) :: A_K,B_K,C_K,D_K
-#endif
 REAL, OPTIONAL                     :: PRESIDUAL
 !JUAN Z_SPLITING
 END SUBROUTINE PRESSUREZ
@@ -125,11 +114,6 @@ END MODULE MODI_PRESSUREZ
       PRUS,PRVS,PRWS,PPABST,                                               &
       PBFB,                                                                &
       PBF_SXP2_YP1_Z,                                                      &
-#ifdef MNH_MGSOLVER
-      PAF_ZS,PBF_ZS,PCF_ZS,                                                &
-      PDXATH_ZS,PDYATH_ZS,PRHO_ZS,                                         &
-      A_K,B_K,C_K,D_K,                                                     &
-#endif
       PRESIDUAL                                           ) !JUAN Z_SPLITING
 !     ######################################################################
 !
@@ -370,12 +354,6 @@ REAL, DIMENSION(:,:,:), INTENT(IN) :: PBFB       ! elements of the tri-diag b-sl
                                                  ! matrix in the pressure eq.
 REAL, DIMENSION(:,:,:), INTENT(IN) :: PBF_SXP2_YP1_Z       ! elements of the tri-diag. SXP2_YP1_Z-slide 
                                                    ! matrix in the pressure eq.
-#ifdef MNH_MGSOLVER
-REAL, DIMENSION(:,:,:), INTENT(IN) :: PAF_ZS,PBF_ZS,PCF_ZS
-REAL, DIMENSION(:,:)  , INTENT(IN) :: PDXATH_ZS,PDYATH_ZS
-REAL, DIMENSION(:,:,:), INTENT(IN) :: PRHO_ZS
-REAL, DIMENSION(:)    , INTENT(IN) :: A_K,B_K,C_K,D_K
-#endif
 REAL, OPTIONAL                     :: PRESIDUAL
 !JUAN Z_SPLITING
 !
@@ -751,10 +729,7 @@ ELSE
   CASE('ZSOLV')     ! Conjugate Residual method
     CALL ZSOLVER( HLBCX, HLBCY, PDXX, PDYY, PDZX, PDZY, PDZZ, &
                   PRHODJ, ZTHETAV, PDXHATM, PDYHATM, PRHOT,   &
-                  KITR, ZDV_SOURCE, ZPHIT,                    &
-                  PAF_ZS, PBF_ZS, PCF_ZS,                     &
-                  PDXATH_ZS, PDYATH_ZS, PRHO_ZS, PBFB,        &
-                  A_K, B_K, C_K, D_K )
+                  KITR, ZDV_SOURCE, ZPHIT                     )
 !
 #endif
   CASE('ZRESI')     ! Conjugate Residual method
diff --git a/src/MNH/zsolver.f90 b/src/MNH/zsolver.f90
index 8afebbf78ab44184e45a1af979af378b37be5315..36f2e3f91b7fb34ecb781b272cea7a03d9f9e29a 100644
--- a/src/MNH/zsolver.f90
+++ b/src/MNH/zsolver.f90
@@ -12,10 +12,7 @@ INTERFACE
 !
       SUBROUTINE ZSOLVER( HLBCX, HLBCY, PDXX, PDYY, PDZX, PDZY, PDZZ, &
                           PRHODJ, PTHETAV, PDXHATM, PDYHATM, PRHOM,   &
-                          KITR, PY, PPHI,                             &
-                          PAF_ZS, PBF_ZS, PCF_ZS,                     &
-                          PDXATH_ZS, PDYATH_ZS, PRHO_ZS, PBFB,        &
-                          A_K, B_K, C_K, D_K ) !JUAN FULL ZSOLVER
+                          KITR, PY, PPHI                              )
 !
 IMPLICIT NONE
 !
@@ -46,11 +43,6 @@ INTEGER, INTENT(IN) :: KITR                      ! number of iterations for the
 REAL, DIMENSION(:,:,:), INTENT(IN) :: PY         ! RHS of the equation
 !          
 REAL, DIMENSION(:,:,:), INTENT(INOUT) :: PPHI    ! solution of the equation 
-
-REAL, DIMENSION(:,:,:), INTENT(IN) :: PAF_ZS,PBF_ZS,PCF_ZS
-REAL, DIMENSION(:,:)  , INTENT(IN) :: PDXATH_ZS,PDYATH_ZS
-REAL, DIMENSION(:,:,:), INTENT(IN) :: PRHO_ZS,PBFB
-REAL, DIMENSION(:)    , INTENT(IN) :: A_K,B_K,C_K,D_K
 !
 END SUBROUTINE ZSOLVER
 !
@@ -63,10 +55,7 @@ END  MODULE MODI_ZSOLVER
 !     #################################################################
       SUBROUTINE ZSOLVER( HLBCX, HLBCY, PDXX, PDYY, PDZX, PDZY, PDZZ, &
                           PRHODJ, PTHETAV, PDXHATM, PDYHATM, PRHOM,   &
-                          KITR, PY, PPHI,                             &
-                          PAF_ZS, PBF_ZS, PCF_ZS,                     &
-                          PDXATH_ZS, PDYATH_ZS, PRHO_ZS, PBFB,        &
-                          A_K, B_K, C_K, D_K ) !JUAN FULL ZSOLVER
+                          KITR, PY, PPHI                              )
 !     #################################################################
 !
 !!****  *CONRESOL * - solve an elliptic equation by the conjugate residual
@@ -99,14 +88,11 @@ END  MODULE MODI_ZSOLVER
 !!    --------
 !!      Subroutine GDIV: compute J times the divergence of 1/J times a vector
 !!      Function QLAP: compute the complete quasi-Laplacian Q
-!!      Subroutine FLAT_INV : invert the flat quasi-laplacien F
 !!      Function DOTPROD: compute the dot product of 2 vectors
 !!
 !!    IMPLICIT ARGUMENTS
 !!    ------------------ 
-!!      Module MODI_GDIV: interface for the subroutine GDIV
 !!      Module MODI_QLAP: interface for the function QLAP
-!!      Module MODI_FLAT_INV: interface for the subroutine FLAT_INV
 !!      Module MODI_DOTPROD: interface for the function DOTPROD
 !!
 !!    REFERENCE
@@ -129,9 +115,7 @@ END  MODULE MODI_ZSOLVER
 !*       0.     DECLARATIONS
 !               ------------
 !
-USE MODI_GDIV
 USE MODI_QLAP
-USE MODI_FLAT_INV
 USE MODI_ZSOLVER_INV
 USE MODI_DOTPROD
 !
@@ -173,11 +157,6 @@ INTEGER, INTENT(IN) :: KITR                      ! number of iterations for the
 REAL, DIMENSION(:,:,:), INTENT(IN) :: PY         ! RHS of the equation
 !          
 REAL, DIMENSION(:,:,:), INTENT(INOUT) :: PPHI    ! solution of the equation 
-
-REAL, DIMENSION(:,:,:), INTENT(IN) :: PAF_ZS,PBF_ZS,PCF_ZS
-REAL, DIMENSION(:,:)  , INTENT(IN) :: PDXATH_ZS,PDYATH_ZS
-REAL, DIMENSION(:,:,:), INTENT(IN) :: PRHO_ZS,PBFB
-REAL, DIMENSION(:)    , INTENT(IN) :: A_K,B_K,C_K,D_K
 !
 !*      0.2    declarations of local variables
 !
@@ -204,17 +183,6 @@ if ( mppdb_initialized ) then
   !Check all in arrays
    call Mppdb_check( PY,       "Zsolver beg:PY"       )
    call Mppdb_check( PPHI,     "Zsolver beg:PPHI"     )
-   call Mppdb_check( PAF_ZS,   "Zsolver beg:PAF_ZS"     )
-   call Mppdb_check( PBF_ZS,   "Zsolver beg:PBF_ZS"     )
-   call Mppdb_check( PCF_ZS,   "Zsolver beg:PCF_ZS"     )
-   call Mppdb_check( PDXATH_ZS,"Zsolver beg:PDXATH_ZS"     )
-   call Mppdb_check( PDYATH_ZS,"Zsolver beg:PDYATH_ZS"     )
-   call Mppdb_check( PRHO_ZS,  "Zsolver beg:PRHO_ZS"     )
-   call Mppdb_check( PBFB,     "Zsolver beg:PBFB"     )
-   call Mppdb_check( A_K,      "Zsolver beg:A_K"     )
-   call Mppdb_check( B_K,      "Zsolver beg:B_K"     )
-   call Mppdb_check( C_K,      "Zsolver beg:C_K"     )
-   call Mppdb_check( D_K,      "Zsolver beg:D_K"     )
 end if
 !
 JIU =  size(PPHI, 1 )
@@ -245,10 +213,7 @@ ZRESIDUE = ZRESIDUE - PY
 !
 !*       1.2    compute the vector: p^(0) = F^(-1)*( Q(PHI) - Y )
 !    
-CALL ZSOLVER_INV( HLBCX, HLBCY, PDXHATM, PDYHATM, PRHOM, ZRESIDUE, ZP, &
-                  PAF_ZS, PBF_ZS, PCF_ZS,                              &
-                  PDXATH_ZS, PDYATH_ZS, PRHO_ZS, PBFB,                 &
-                  A_K, B_K, C_K, D_K )
+CALL ZSOLVER_INV( HLBCX, HLBCY, PDXHATM, PDYHATM, PRHOM, ZRESIDUE, ZP )
 !
 !*       1.3    compute the vector: delta^(0) = Q ( p^(0) )
 !
@@ -286,10 +251,7 @@ DO JM = 1,KITR
 !
 !*       2.4    compute the vector: q = F^(-1)*( Q(PHI) - Y )
 !
-  CALL ZSOLVER_INV( HLBCX, HLBCY, PDXHATM, PDYHATM, PRHOM, ZRESIDUE, ZQ, &
-                    PAF_ZS, PBF_ZS, PCF_ZS,                              &
-                    PDXATH_ZS, PDYATH_ZS, PRHO_ZS, PBFB,                 &
-                    A_K, B_K, C_K, D_K )
+  CALL ZSOLVER_INV( HLBCX, HLBCY, PDXHATM, PDYHATM, PRHOM, ZRESIDUE, ZQ )
 !
 !*       2.5     compute the auxiliary field: ksi = Q ( q )
 !
diff --git a/src/MNH/zsolver_inv.f90 b/src/MNH/zsolver_inv.f90
index e904015bccbc673e46835f18acf0e626d6279abe..a488737d08368e51bee9167f51d962c466cd44e9 100644
--- a/src/MNH/zsolver_inv.f90
+++ b/src/MNH/zsolver_inv.f90
@@ -11,9 +11,7 @@
 INTERFACE
 !
       SUBROUTINE ZSOLVER_INV( HLBCX, HLBCY, PDXHATM, PDYHATM, PRHOM, &
-                              PY, PF_1_Y, PAF_ZS, PBF_ZS, PCF_ZS,    &
-                              PDXATH_ZS, PDYATH_ZS, PRHO_ZS, PBFB,   &
-                              A_K, B_K, C_K, D_K )
+                              PY, PF_1_Y )
 !
 !
 IMPLICIT NONE
@@ -33,12 +31,6 @@ REAL, DIMENSION(:,:,:), INTENT(IN) :: PY         ! RHS of the equation
 !
 REAL, DIMENSION(:,:,:), INTENT(OUT):: PF_1_Y     ! solution of the equation
 !
-REAL, DIMENSION(:,:,:), INTENT(IN) :: PAF_ZS,PBF_ZS,PCF_ZS
-REAL, DIMENSION(:,:)  , INTENT(IN) :: PDXATH_ZS,PDYATH_ZS
-REAL, DIMENSION(:,:,:), INTENT(IN) :: PRHO_ZS,PBFB
-REAL, DIMENSION(:)    , INTENT(IN) :: A_K,B_K,C_K,D_K
-!
-!
 END SUBROUTINE ZSOLVER_INV
 !
 END INTERFACE
@@ -46,9 +38,7 @@ END INTERFACE
 END MODULE MODI_ZSOLVER_INV
 !     ################################################################
       SUBROUTINE ZSOLVER_INV( HLBCX, HLBCY, PDXHATM, PDYHATM, PRHOM, &
-                              PY, PF_1_Y, PAF_ZS, PBF_ZS, PCF_ZS,    &
-                              PDXATH_ZS, PDYATH_ZS, PRHO_ZS, PBFB,   &
-                              A_K, B_K, C_K, D_K )
+                              PY, PF_1_Y )
   !     ##############################################################
   !
   !!****  *FLAT_INV * - Invert the flat quasi-laplacian operator
@@ -154,11 +144,6 @@ END MODULE MODI_ZSOLVER_INV
   !
   REAL, DIMENSION(:,:,:), INTENT(OUT):: PF_1_Y     ! solution of the equation
   !
-  REAL, DIMENSION(:,:,:), INTENT(IN) :: PAF_ZS,PBF_ZS,PCF_ZS
-  REAL, DIMENSION(:,:)  , INTENT(IN) :: PDXATH_ZS,PDYATH_ZS
-  REAL, DIMENSION(:,:,:), INTENT(IN) :: PRHO_ZS,PBFB
-  REAL, DIMENSION(:)    , INTENT(IN) :: A_K,B_K,C_K,D_K
-  !
   !*       0.2   declaration of local variables
   !
   REAL, DIMENSION(:,:,:), pointer , contiguous :: ZY ! work array to store 
@@ -183,17 +168,6 @@ END MODULE MODI_ZSOLVER_INV
      call Mppdb_check( PRHOM,    "Zsolver_inv beg:PRHOM"       )
      call Mppdb_check( PY,       "Zsolver_inv beg:PY"       )
      call Mppdb_check( PF_1_Y,   "Zsolver_inv beg:PF_1_Y"       )
-     call Mppdb_check( PAF_ZS,   "Zsolver_inv beg:PAF_ZS"       )
-     call Mppdb_check( PBF_ZS,   "Zsolver_inv beg:PBF_ZS"       )
-     call Mppdb_check( PCF_ZS,   "Zsolver_inv beg:PCF_ZS"       )
-     call Mppdb_check( PDXATH_ZS,"Zsolver_inv beg:PDXATH_ZS"       )
-     call Mppdb_check( PDYATH_ZS,"Zsolver_inv beg:PDYATH_ZS"       )
-     call Mppdb_check( PRHO_ZS,  "Zsolver_inv beg:PRHO_ZS"       )
-     call Mppdb_check( PBFB,     "Zsolver_inv beg:PBFB"       )
-     call Mppdb_check( A_K,      "Zsolver_inv beg:A_K"       )
-     call Mppdb_check( B_K,      "Zsolver_inv beg:B_K"       )
-     call Mppdb_check( C_K,      "Zsolver_inv beg:C_K"       )
-     call Mppdb_check( D_K,      "Zsolver_inv beg: D_K"       )
   end if
   !
   !CALL GET_PHYSICAL_ll(IIB,IJB,IIE,IJE)