diff --git a/CMakeLists.txt b/CMakeLists.txt
index 6bec7a476e6..22924503c2e 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -486,14 +486,6 @@ else()
   set(EBOS_DEBUG_EXTENSIONS_DEFAULT_ENABLE_IF "TRUE")
 endif()
 
-opm_add_test(ebos_altidx
-  ONLY_COMPILE
-  DEFAULT_ENABLE_IF ${EBOS_DEBUG_EXTENSIONS_DEFAULT_ENABLE_IF}
-  SOURCES ebos/ebos_altidx.cc
-  EXE_NAME ebos_altidx
-  DEPENDS opmsimulators
-  LIBRARIES opmsimulators)
-
 opm_add_test(ebos_plain
   ONLY_COMPILE
   DEFAULT_ENABLE_IF ${EBOS_DEBUG_EXTENSIONS_DEFAULT_ENABLE_IF}
diff --git a/ebos/ebos_altidx.cc b/ebos/ebos_altidx.cc
deleted file mode 100644
index 5c715791ad2..00000000000
--- a/ebos/ebos_altidx.cc
+++ /dev/null
@@ -1,62 +0,0 @@
-// -*- mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
-// vi: set et ts=4 sw=4 sts=4:
-/*
-  This file is part of the Open Porous Media project (OPM).
-
-  OPM is free software: you can redistribute it and/or modify
-  it under the terms of the GNU General Public License as published by
-  the Free Software Foundation, either version 2 of the License, or
-  (at your option) any later version.
-
-  OPM is distributed in the hope that it will be useful,
-  but WITHOUT ANY WARRANTY; without even the implied warranty of
-  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-  GNU General Public License for more details.
-
-  You should have received a copy of the GNU General Public License
-  along with OPM.  If not, see <http://www.gnu.org/licenses/>.
-
-  Consult the COPYING file in the top-level source directory of this
-  module for the precise wording of the license and the list of
-  copyright holders.
-*/
-/*!
- * \file
- *
- * \brief This is an ebos variant which uses alternative phase and component indices than
- *        the default variant.
- *
- * It is purely for testing purposes and is supposed to produce bitwise identical
- * results.
- */
-#include "config.h"
-
-#include "ebos.hh"
-#include "startEbos.hh"
-#include "eclalternativeblackoilindices.hh"
-
-namespace Opm::Properties {
-
-namespace TTag {
-struct EbosAltIdxTypeTag {
-    using InheritsFrom = std::tuple<EbosTypeTag>;
-};
-}
-
-// use a fluid system with different indices than the default
-template<class TypeTag>
-struct FluidSystem<TypeTag, TTag::EbosAltIdxTypeTag>
-{
-    using Scalar = GetPropType<TypeTag, Properties::Scalar>;
-
-public:
-    typedef BlackOilFluidSystem<Scalar, EclAlternativeBlackOilIndexTraits> type;
-};
-
-} // namespace Opm::Properties
-
-int main(int argc, char **argv)
-{
-    using ProblemTypeTag = Opm::Properties::TTag::EbosAltIdxTypeTag;
-    return Opm::startEbos<ProblemTypeTag>(argc, argv);
-}
diff --git a/ebos/eclalternativeblackoilindices.hh b/ebos/eclalternativeblackoilindices.hh
deleted file mode 100644
index e2758f36da3..00000000000
--- a/ebos/eclalternativeblackoilindices.hh
+++ /dev/null
@@ -1,47 +0,0 @@
-// -*- mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
-// vi: set et ts=4 sw=4 sts=4:
-/*
-  This file is part of the Open Porous Media project (OPM).
-
-  OPM is free software: you can redistribute it and/or modify
-  it under the terms of the GNU General Public License as published by
-  the Free Software Foundation, either version 2 of the License, or
-  (at your option) any later version.
-
-  OPM is distributed in the hope that it will be useful,
-  but WITHOUT ANY WARRANTY; without even the implied warranty of
-  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-  GNU General Public License for more details.
-
-  You should have received a copy of the GNU General Public License
-  along with OPM.  If not, see <http://www.gnu.org/licenses/>.
-
-  Consult the COPYING file in the top-level source directory of this
-  module for the precise wording of the license and the list of
-  copyright holders.
-*/
-
-#ifndef ECL_ALTERNATIVE_BLACKOIL_INDICES_HH
-#define ECL_ALTERNATIVE_BLACKOIL_INDICES_HH
-
-#include <opm/material/fluidsystems/BlackOilFluidSystem.hpp>
-
-namespace Opm {
-
-class EclAlternativeBlackOilIndexTraits
-{
-    using DIT = Opm::BlackOilDefaultIndexTraits;
-
-public:
-    static const unsigned waterPhaseIdx = DIT::oilPhaseIdx;
-    static const unsigned oilPhaseIdx = DIT::gasPhaseIdx;
-    static const unsigned gasPhaseIdx = DIT::waterPhaseIdx;
-
-    static const unsigned waterCompIdx = DIT::gasCompIdx;
-    static const unsigned oilCompIdx = DIT::waterCompIdx;
-    static const unsigned gasCompIdx = DIT::oilCompIdx;
-};
-
-}
-
-#endif
diff --git a/ebos/eclgenericoutputblackoilmodule.cc b/ebos/eclgenericoutputblackoilmodule.cc
index 05daf6220b0..be487bf0090 100644
--- a/ebos/eclgenericoutputblackoilmodule.cc
+++ b/ebos/eclgenericoutputblackoilmodule.cc
@@ -23,7 +23,6 @@
 
 #include <config.h>
 #include <ebos/eclgenericoutputblackoilmodule.hh>
-#include <ebos/eclalternativeblackoilindices.hh>
 
 #include <opm/common/OpmLog/OpmLog.hpp>
 
@@ -1641,6 +1640,5 @@ updateSummaryRegionValues(const Inplace& inplace,
 }
 
 template class EclGenericOutputBlackoilModule<BlackOilFluidSystem<double,BlackOilDefaultIndexTraits>,double>;
-template class EclGenericOutputBlackoilModule<BlackOilFluidSystem<double,EclAlternativeBlackOilIndexTraits>,double>;
 
 } // namespace Opm
diff --git a/ebos/eclgenericproblem.cc b/ebos/eclgenericproblem.cc
index b27b078362b..f7986acc01e 100644
--- a/ebos/eclgenericproblem.cc
+++ b/ebos/eclgenericproblem.cc
@@ -24,8 +24,6 @@
 #include <config.h>
 #include <ebos/eclgenericproblem.hh>
 
-#include <ebos/eclalternativeblackoilindices.hh>
-
 #include <opm/material/fluidsystems/BlackOilFluidSystem.hpp>
 
 #include <opm/parser/eclipse/Deck/Deck.hpp>
@@ -642,16 +640,10 @@ initDRSDT_(size_t numDof,
 template class EclGenericProblem<Dune::GridView<Dune::Fem::GridPart2GridViewTraits<Dune::Fem::AdaptiveLeafGridPart<Dune::CpGrid, Dune::PartitionIteratorType(4), false>>>,
                                  BlackOilFluidSystem<double,BlackOilDefaultIndexTraits>,
                                  double>;
-template class EclGenericProblem<Dune::GridView<Dune::Fem::GridPart2GridViewTraits<Dune::Fem::AdaptiveLeafGridPart<Dune::CpGrid, Dune::PartitionIteratorType(4), false>>>,
-                                 BlackOilFluidSystem<double,EclAlternativeBlackOilIndexTraits>,
-                                 double>;
 #else
 template class EclGenericProblem<Dune::GridView<Dune::DefaultLeafGridViewTraits<Dune::CpGrid>>,
                                  BlackOilFluidSystem<double,BlackOilDefaultIndexTraits>,
                                  double>;
-template class EclGenericProblem<Dune::GridView<Dune::DefaultLeafGridViewTraits<Dune::CpGrid>>,
-                                 BlackOilFluidSystem<double,EclAlternativeBlackOilIndexTraits>,
-                                 double>;
 #endif
 
 template class EclGenericProblem<Dune::GridView<Dune::PolyhedralGridViewTraits<3,3,double,Dune::PartitionIteratorType(4)>>,
diff --git a/opm/simulators/wells/MultisegmentWellEval.cpp b/opm/simulators/wells/MultisegmentWellEval.cpp
index 3155508e919..2e4a9109467 100644
--- a/opm/simulators/wells/MultisegmentWellEval.cpp
+++ b/opm/simulators/wells/MultisegmentWellEval.cpp
@@ -21,8 +21,6 @@
 #include <config.h>
 #include <opm/simulators/wells/MultisegmentWellEval.hpp>
 
-#include <ebos/eclalternativeblackoilindices.hh>
-
 #include <opm/material/fluidsystems/BlackOilFluidSystem.hpp>
 
 #include <opm/models/blackoil/blackoilindices.hh>
@@ -2011,7 +2009,4 @@ INSTANCE(BlackOilDefaultIndexTraits,BlackOilIndices<0u,0u,1u,0u,false,false,0u>)
 INSTANCE(BlackOilDefaultIndexTraits,BlackOilIndices<0u,0u,0u,1u,false,false,0u>)
 INSTANCE(BlackOilDefaultIndexTraits,BlackOilIndices<0u,0u,0u,0u,false,false,1u>)
 
-// Alt indices
-INSTANCE(EclAlternativeBlackOilIndexTraits,BlackOilIndices<0u,0u,0u,0u,false,false,0u>)
-
 } // namespace Opm
diff --git a/opm/simulators/wells/StandardWellEval.cpp b/opm/simulators/wells/StandardWellEval.cpp
index 0337076a9e7..214bb42fdd1 100644
--- a/opm/simulators/wells/StandardWellEval.cpp
+++ b/opm/simulators/wells/StandardWellEval.cpp
@@ -22,8 +22,6 @@
 #include <config.h>
 #include <opm/simulators/wells/StandardWellEval.hpp>
 
-#include <ebos/eclalternativeblackoilindices.hh>
-
 #include <opm/material/densead/DynamicEvaluation.hpp>
 #include <opm/material/fluidsystems/BlackOilFluidSystem.hpp>
 
@@ -1276,7 +1274,4 @@ INSTANCE(BlackOilDefaultIndexTraits,BlackOilIndices<0u,0u,1u,0u,false,false,0u>)
 INSTANCE(BlackOilDefaultIndexTraits,BlackOilIndices<0u,0u,0u,1u,false,false,0u>)
 INSTANCE(BlackOilDefaultIndexTraits,BlackOilIndices<0u,0u,0u,1u,false,false,1u>)
 
-// Alternative indices
-INSTANCE(EclAlternativeBlackOilIndexTraits,BlackOilIndices<0u,0u,0u,0u,false,false,0u>)
-
 }
diff --git a/opm/simulators/wells/WellInterfaceEval.cpp b/opm/simulators/wells/WellInterfaceEval.cpp
index 0d43a29b9f8..18014737159 100644
--- a/opm/simulators/wells/WellInterfaceEval.cpp
+++ b/opm/simulators/wells/WellInterfaceEval.cpp
@@ -22,8 +22,6 @@
 #include <config.h>
 #include <opm/simulators/wells/WellInterfaceEval.hpp>
 
-#include <ebos/eclalternativeblackoilindices.hh>
-
 #include <opm/material/densead/Evaluation.hpp>
 #include <opm/material/fluidsystems/BlackOilFluidSystem.hpp>
 
@@ -535,10 +533,8 @@ calculateBhpFromThp<__VA_ARGS__>(const WellState&, \
                                  DeferredLogger&) const;
 
 using FluidSys = BlackOilFluidSystem<double, BlackOilDefaultIndexTraits>;
-using FluidAltSys = BlackOilFluidSystem<double, EclAlternativeBlackOilIndexTraits>;
 
 template class WellInterfaceEval<FluidSys>;
-template class WellInterfaceEval<FluidAltSys>;
 
 INSTANCE_METHODS(FluidSys, DenseAd::Evaluation<double,3,0u>)
 INSTANCE_METHODS(FluidSys, DenseAd::Evaluation<double,4,0u>)
@@ -554,9 +550,6 @@ INSTANCE_METHODS(FluidSys, DenseAd::Evaluation<double,-1,8u>)
 INSTANCE_METHODS(FluidSys, DenseAd::Evaluation<double,-1,9u>)
 INSTANCE_METHODS(FluidSys, DenseAd::Evaluation<double,-1,10u>)
 
-INSTANCE_METHODS(FluidAltSys, DenseAd::Evaluation<double,7,0u>)
-INSTANCE_METHODS(FluidAltSys, DenseAd::Evaluation<double,-1,8u>)
-
 #define INSTANCE_BHP(...) \
 template double WellInterfaceEval<__VA_ARGS__>:: \
 calculateBhpFromThp<double>(const WellState&, \
@@ -567,6 +560,5 @@ calculateBhpFromThp<double>(const WellState&, \
                             DeferredLogger&) const;
 
 INSTANCE_BHP(FluidSys)
-INSTANCE_BHP(FluidAltSys)
 
 } // namespace Opm
diff --git a/opm/simulators/wells/WellInterfaceFluidSystem.cpp b/opm/simulators/wells/WellInterfaceFluidSystem.cpp
index a41e4a9b1c9..5375d51b7b9 100644
--- a/opm/simulators/wells/WellInterfaceFluidSystem.cpp
+++ b/opm/simulators/wells/WellInterfaceFluidSystem.cpp
@@ -34,7 +34,6 @@
 #include <opm/simulators/wells/WellState.hpp>
 #include <opm/simulators/wells/GroupState.hpp>
 #include <opm/simulators/wells/TargetCalculator.hpp>
-#include <ebos/eclalternativeblackoilindices.hh>
 
 #include <cassert>
 #include <cmath>
@@ -1102,6 +1101,5 @@ getGroupProductionTargetRate(const Group& group,
     return scale;
 }
 template class WellInterfaceFluidSystem<BlackOilFluidSystem<double,BlackOilDefaultIndexTraits>>;
-template class WellInterfaceFluidSystem<BlackOilFluidSystem<double,EclAlternativeBlackOilIndexTraits>>;
 
 } // namespace Opm
diff --git a/opm/simulators/wells/WellInterfaceIndices.cpp b/opm/simulators/wells/WellInterfaceIndices.cpp
index 7c1fc558ffc..852e5979872 100644
--- a/opm/simulators/wells/WellInterfaceIndices.cpp
+++ b/opm/simulators/wells/WellInterfaceIndices.cpp
@@ -22,8 +22,6 @@
 #include <config.h>
 #include <opm/simulators/wells/WellInterfaceIndices.hpp>
 
-#include <ebos/eclalternativeblackoilindices.hh>
-
 #include <opm/material/fluidsystems/BlackOilFluidSystem.hpp>
 
 #include <opm/models/blackoil/blackoilindices.hh>
@@ -143,7 +141,4 @@ INSTANCE(BlackOilDefaultIndexTraits,BlackOilIndices<0u,0u,0u,1u,false,false,0u>)
 INSTANCE(BlackOilDefaultIndexTraits,BlackOilIndices<0u,0u,0u,1u,false,false,1u>)
 INSTANCE(BlackOilDefaultIndexTraits,BlackOilIndices<0u,0u,0u,0u,false,false,1u>)
 
-// Alternative indices
-INSTANCE(EclAlternativeBlackOilIndexTraits,BlackOilIndices<0u,0u,0u,0u,false,false,0u>)
-
 } // namespace Opm