diff --git a/src/common_io.h b/src/common_io.h
index 70ed25993cb110a1faf42a41c08d316c81b54271..334349ccccb85344cc250b24c2a68dc4a455b77d 100644
--- a/src/common_io.h
+++ b/src/common_io.h
@@ -108,7 +108,6 @@ void writeXMFline(FILE* xmfFile, char* fileName, char* partTypeGroupName,
                   char* name, size_t N, int dim, enum DATA_TYPE type);
 
 void writeCodeDescription(hid_t h_file);
-void writeSPHflavour(hid_t h_file);
 void writeUnitSystem(hid_t h_file, struct UnitSystem* us);
 
 #endif
diff --git a/src/hydro/Default/hydro_io.h b/src/hydro/Default/hydro_io.h
index 09a7f4c7caa6a2a9fcf77c8d83b0ffcab2ef8b54..de71963b05149fa0b2df6222424478a6ad9b1f44 100644
--- a/src/hydro/Default/hydro_io.h
+++ b/src/hydro/Default/hydro_io.h
@@ -104,10 +104,6 @@ void writeSPHflavour(hid_t h_grpsph) {
 
   /* Kernel function description */
   writeAttribute_s(h_grpsph, "Kernel", kernel_name);
-  // writeAttribute_f(h_grpsph, "Kernel eta", const_eta_kernel);
-  // writeAttribute_f(h_grpsph, "Weighted N_ngb", kernel_nwneigh);
-  // writeAttribute_f(h_grpsph, "Delta N_ngb", const_delta_nwneigh);
-  // writeAttribute_f(h_grpsph, "Hydro gamma", const_hydro_gamma);
 
   /* Viscosity and thermal conduction */
   writeAttribute_s(h_grpsph, "Thermal Conductivity Model",
@@ -123,11 +119,6 @@ void writeSPHflavour(hid_t h_grpsph) {
   writeAttribute_f(h_grpsph, "Viscosity decay length", const_viscosity_length);
 
   /* Time integration properties */
-  // writeAttribute_f(h_grpsph, "CFL parameter", const_cfl);
-  // writeAttribute_f(h_grpsph, "Maximal ln(Delta h) change over dt",
-  //                 const_ln_max_h_change);
-  // writeAttribute_f(h_grpsph, "Maximal Delta h change over dt",
-  //                 exp(const_ln_max_h_change));
   writeAttribute_f(h_grpsph, "Maximal Delta u change over dt",
                    const_max_u_change);
 }
diff --git a/src/hydro/Gadget2/hydro_io.h b/src/hydro/Gadget2/hydro_io.h
index 41f3348db10172c1d0d5813debb50365252a413b..d85409bc19be02369cee3a6a1cbe150ab171364b 100644
--- a/src/hydro/Gadget2/hydro_io.h
+++ b/src/hydro/Gadget2/hydro_io.h
@@ -104,10 +104,6 @@ void writeSPHflavour(hid_t h_grpsph) {
 
   /* Kernel function description */
   writeAttribute_s(h_grpsph, "Kernel", kernel_name);
-  // writeAttribute_f(h_grpsph, "Kernel eta", const_eta_kernel);
-  // writeAttribute_f(h_grpsph, "Weighted N_ngb", kernel_nwneigh);
-  // writeAttribute_f(h_grpsph, "Delta N_ngb", const_delta_nwneigh);
-  // writeAttribute_f(h_grpsph, "Hydro gamma", const_hydro_gamma);
 
   /* Viscosity and thermal conduction */
   writeAttribute_s(h_grpsph, "Thermal Conductivity Model",
@@ -117,10 +113,4 @@ void writeSPHflavour(hid_t h_grpsph) {
   writeAttribute_f(h_grpsph, "Viscosity alpha", const_viscosity_alpha);
   writeAttribute_f(h_grpsph, "Viscosity beta", 3.f);
 
-  /* Time integration properties */
-  // writeAttribute_f(h_grpsph, "CFL parameter", const_cfl);
-  // writeAttribute_f(h_grpsph, "Maximal ln(Delta h) change over dt",
-  //                 const_ln_max_h_change);
-  // writeAttribute_f(h_grpsph, "Maximal Delta h change over dt",
-  //                 exp(const_ln_max_h_change));
 }
diff --git a/src/hydro/Minimal/hydro_io.h b/src/hydro/Minimal/hydro_io.h
index 43926d526b47fa8f1b92bb862edabefb7417de3c..1bbfe1065358017e0b27e2131ff717848221fe9c 100644
--- a/src/hydro/Minimal/hydro_io.h
+++ b/src/hydro/Minimal/hydro_io.h
@@ -104,9 +104,6 @@ void writeSPHflavour(hid_t h_grpsph) {
 
   /* Kernel function description */
   writeAttribute_s(h_grpsph, "Kernel", kernel_name);
-  // writeAttribute_f(h_grpsph, "Kernel eta", const_eta_kernel);
-  // writeAttribute_f(h_grpsph, "Weighted N_ngb", kernel_nwneigh);
-  // writeAttribute_f(h_grpsph, "Delta N_ngb", const_delta_nwneigh);
   writeAttribute_f(h_grpsph, "Hydro gamma", const_hydro_gamma);
 
   /* Viscosity and thermal conduction */
@@ -115,11 +112,6 @@ void writeSPHflavour(hid_t h_grpsph) {
   writeAttribute_s(h_grpsph, "Viscosity Model", "No model");
 
   /* Time integration properties */
-  // writeAttribute_f(h_grpsph, "CFL parameter", const_cfl);
-  // writeAttribute_f(h_grpsph, "Maximal ln(Delta h) change over dt",
-  //                 const_ln_max_h_change);
-  // writeAttribute_f(h_grpsph, "Maximal Delta h change over dt",
-  //                 exp(const_ln_max_h_change));
   writeAttribute_f(h_grpsph, "Maximal Delta u change over dt",
                    const_max_u_change);
 }