diff --git a/src/reaction_modules/asm3_class Koch.js b/src/reaction_modules/asm3_class Koch.js
index 741c3e7..ff6a8d2 100644
--- a/src/reaction_modules/asm3_class Koch.js	
+++ b/src/reaction_modules/asm3_class Koch.js	
@@ -7,6 +7,62 @@ const ASM_CONSTANTS = {
   NUM_SPECIES: 13
 };
 
+const KINETIC_CONSTANTS = {
+  // Hydrolysis
+  k_H:      9.,   // hydrolysis rate constant       [g X_S g-1 X_H d-1]
+  K_X:      1.,   // hydrolysis saturation constant [g X_S g-1 X_H] 
+  // Heterotrophs
+  k_STO:    12.,  // storage rate constant          [g S_S g-1 X_H d-1]
+  nu_NO:    0.5,  // anoxic reduction factor        [-]
+  K_O:      0.2,  // saturation constant S_0        [g O2 m-3]
+  K_NO:     0.5,  // saturation constant S_NO       [g NO3-N m-3]
+  K_S:      10.,  // saturation constant S_s        [g COD m-3]
+  K_STO:    0.1,  // saturation constant X_STO      [g X_STO g-1 X_H]
+  mu_H_max: 3.,   // maximum specific growth rate   [d-1]
+  K_NH:     0.01, // saturation constant S_NH3      [g NH3-N m-3]
+  K_HCO:    0.1,  // saturation constant S_HCO      [mole HCO3 m-3]
+  b_H_O:    0.3,  // aerobic respiration rate       [d-1]
+  b_H_NO:   0.15, // anoxic respiration rate        [d-1]
+  b_STO_O:  0.3,  // aerobic respitation rate X_STO [d-1]
+  b_STO_NO: 0.15, // anoxic respitation rate X_STO  [d-1]
+  // Autotrophs
+  mu_A_max: 1.3,  // maximum specific growth rate   [d-1]
+  K_A_NH:   1.4,  // saturation constant S_NH3      [g NH3-N m-3] 
+  K_A_O:    0.5,  // saturation constant S_0        [g O2 m-3]
+  K_A_HCO:  0.5,  // saturation constant S_HCO      [mole HCO3 m-3]
+  b_A_O:    0.20, // aerobic respiration rate       [d-1]
+  b_A_NO:   0.10  // anoxic respiration rate        [d-1]
+};
+
+const STOICHIOMETRIC_CONSTANTS = {
+  // Fractions
+  f_SI:     0.,   // fraction S_I from hydrolysis   [g S_I g-1 X_S]
+  f_XI:     0.2,  // fraction X_I from decomp X_H   [g X_I g-1 X_H]
+  // Yields
+  Y_STO_O:  0.80, // aerobic yield X_STO per S_S    [g X_STO g-1 S_S]
+  Y_STO_NO: 0.70, // anoxic yield X_STO per S_S     [g X_STO g-1 S_S]
+  Y_H_O:    0.80, // aerobic yield X_H per X_STO    [g X_H g-1 X_STO]
+  Y_H_NO:   0.65, // anoxic yield X_H per X_STO     [g X_H g-1 X_STO]
+  Y_A:      0.24, // anoxic yield X_A per S_NO      [g X_A g-1 NO3-N]
+  // Composition (COD via DoR)
+  i_CODN:  -1.71, // COD content (DoR)              [g COD g-1 N2-N]
+  i_CODNO: -4.57, // COD content (DoR)              [g COD g-1 NO3-N]
+  // Composition (nitrogen)
+  i_NSI:    0.01, // nitrogen content S_I           [g N g-1 S_I]
+  i_NSS:    0.03, // nitrogen content S_S           [g N g-1 S_S]
+  i_NXI:    0.04, // nitrogen content X_I           [g N g-1 X_I]
+  i_NXS:    0.03, // nitrogen content X_S           [g N g-1 X_S]
+  i_NBM:    0.07, // nitrogen content X_H / X_A     [g N g-1 X_H / X_A]
+  // Composition (TSS)
+  i_TSXI:   0.75, // TSS content X_I                [g TS g-1 X_I]
+  i_TSXS:   0.75, // TSS content X_S                [g TS g-1 X_S]
+  i_TSBM:   0.90, // TSS content X_H / X_A          [g TS g-1 X_H / X_A]
+  i_TSSTO:  0.60, // TSS content X_STO (PHB based)  [g TS g-1 X_STO]
+  // Composition (charge)
+  i_cNH:    1/14, // charge per S_NH                [mole H+ g-1 NH3-N]
+  i_cNO:   -1/14  // charge per S_NO                [mole H+ g-1 NO3-N]
+};
+
 /**
  * ASM3 class for the Activated Sludge Model No. 3 (ASM3). Using Koch et al. 2000 parameters.
  */
@@ -17,65 +73,13 @@ class ASM3 {
      * Kinetic parameters for ASM3 at 20 C. Using Koch et al. 2000 parameters.
      * @property {Object} kin_params - Kinetic parameters
      */
-    this.kin_params = {
-      // Hydrolysis
-      k_H:      9.,   // hydrolysis rate constant       [g X_S g-1 X_H d-1]
-      K_X:      1.,   // hydrolysis saturation constant [g X_S g-1 X_H] 
-      // Heterotrophs
-      k_STO:    12.,  // storage rate constant          [g S_S g-1 X_H d-1]
-      nu_NO:    0.5,  // anoxic reduction factor        [-]
-      K_O:      0.2,  // saturation constant S_0        [g O2 m-3]
-      K_NO:     0.5,  // saturation constant S_NO       [g NO3-N m-3]
-      K_S:      10.,  // saturation constant S_s        [g COD m-3]
-      K_STO:    0.1,  // saturation constant X_STO      [g X_STO g-1 X_H]
-      mu_H_max: 3.,   // maximum specific growth rate   [d-1]
-      K_NH:     0.01, // saturation constant S_NH3      [g NH3-N m-3]
-      K_HCO:    0.1,  // saturation constant S_HCO      [mole HCO3 m-3]
-      b_H_O:    0.3,  // aerobic respiration rate       [d-1]
-      b_H_NO:   0.15, // anoxic respiration rate        [d-1]
-      b_STO_O:  0.3,  // aerobic respitation rate X_STO [d-1]
-      b_STO_NO: 0.15, // anoxic respitation rate X_STO  [d-1]
-      // Autotrophs
-      mu_A_max: 1.3,  // maximum specific growth rate   [d-1]
-      K_A_NH:   1.4,  // saturation constant S_NH3      [g NH3-N m-3] 
-      K_A_O:    0.5,  // saturation constant S_0        [g O2 m-3]
-      K_A_HCO:  0.5,  // saturation constant S_HCO      [mole HCO3 m-3]
-      b_A_O:    0.20, // aerobic respiration rate       [d-1]
-      b_A_NO:   0.10  // anoxic respiration rate        [d-1]
-    };
+    this.kin_params = KINETIC_CONSTANTS;
 
     /**
      * Stoichiometric and composition parameters for ASM3. Using Koch et al. 2000 parameters.
      * @property {Object} stoi_params - Stoichiometric parameters
      */
-    this.stoi_params = {
-      // Fractions
-      f_SI:     0.,   // fraction S_I from hydrolysis   [g S_I g-1 X_S]
-      f_XI:     0.2,  // fraction X_I from decomp X_H   [g X_I g-1 X_H]
-      // Yields
-      Y_STO_O:  0.80, // aerobic yield X_STO per S_S    [g X_STO g-1 S_S]
-      Y_STO_NO: 0.70, // anoxic yield X_STO per S_S     [g X_STO g-1 S_S]
-      Y_H_O:    0.80, // aerobic yield X_H per X_STO    [g X_H g-1 X_STO]
-      Y_H_NO:   0.65, // anoxic yield X_H per X_STO     [g X_H g-1 X_STO]
-      Y_A:      0.24, // anoxic yield X_A per S_NO      [g X_A g-1 NO3-N]
-      // Composition (COD via DoR)
-      i_CODN:  -1.71, // COD content (DoR)              [g COD g-1 N2-N]
-      i_CODNO: -4.57, // COD content (DoR)              [g COD g-1 NO3-N]
-      // Composition (nitrogen)
-      i_NSI:    0.01, // nitrogen content S_I           [g N g-1 S_I]
-      i_NSS:    0.03, // nitrogen content S_S           [g N g-1 S_S]
-      i_NXI:    0.04, // nitrogen content X_I           [g N g-1 X_I]
-      i_NXS:    0.03, // nitrogen content X_S           [g N g-1 X_S]
-      i_NBM:    0.07, // nitrogen content X_H / X_A     [g N g-1 X_H / X_A]
-      // Composition (TSS)
-      i_TSXI:   0.75, // TSS content X_I                [g TS g-1 X_I]
-      i_TSXS:   0.75, // TSS content X_S                [g TS g-1 X_S]
-      i_TSBM:   0.90, // TSS content X_H / X_A          [g TS g-1 X_H / X_A]
-      i_TSSTO:  0.60, // TSS content X_STO (PHB based)  [g TS g-1 X_STO]
-      // Composition (charge)
-      i_cNH:    1/14, // charge per S_NH                [mole H+ g-1 NH3-N]
-      i_cNO:   -1/14  // charge per S_NO                [mole H+ g-1 NO3-N]
-    };
+    this.stoi_params = STOICHIOMETRIC_CONSTANTS;
 
     /**
      * Temperature theta parameters for ASM3. Using Koch et al. 2000 parameters.
@@ -215,4 +219,4 @@ class ASM3 {
   }
 }
 
-module.exports = { ASM3, ASM_CONSTANTS };
\ No newline at end of file
+module.exports = { ASM3, ASM_CONSTANTS, KINETIC_CONSTANTS, STOICHIOMETRIC_CONSTANTS };
\ No newline at end of file
diff --git a/src/reaction_modules/asm3_class.js b/src/reaction_modules/asm3_class.js
index db39890..53756bf 100644
--- a/src/reaction_modules/asm3_class.js
+++ b/src/reaction_modules/asm3_class.js
@@ -7,6 +7,62 @@ const ASM_CONSTANTS = {
   NUM_SPECIES: 13
 };
 
+const KINETIC_CONSTANTS = {
+  // Hydrolysis
+  k_H:      3.,   // hydrolysis rate constant       [g X_S g-1 X_H d-1]
+  K_X:      1.,   // hydrolysis saturation constant [g X_S g-1 X_H] 
+  // Heterotrophs
+  k_STO:    5.,   // storage rate constant          [g S_S g-1 X_H d-1]
+  nu_NO:    0.6,  // anoxic reduction factor        [-]
+  K_O:      0.2,  // saturation constant S_0        [g O2 m-3]
+  K_NO:     0.5,  // saturation constant S_NO       [g NO3-N m-3]
+  K_S:      2.,   // saturation constant S_s        [g COD m-3]
+  K_STO:    1.,   // saturation constant X_STO      [g X_STO g-1 X_H]
+  mu_H_max: 2.,   // maximum specific growth rate   [d-1]
+  K_NH:     0.01, // saturation constant S_NH3      [g NH3-N m-3]
+  K_HCO:    0.1,  // saturation constant S_HCO      [mole HCO3 m-3]
+  b_H_O:    0.2,  // aerobic respiration rate       [d-1]
+  b_H_NO:   0.1,  // anoxic respiration rate        [d-1]
+  b_STO_O:  0.2,  // aerobic respitation rate X_STO [d-1]
+  b_STO_NO: 0.1,  // anoxic respitation rate X_STO  [d-1]
+  // Autotrophs
+  mu_A_max: 1.0,  // maximum specific growth rate   [d-1]
+  K_A_NH:   1.,   // saturation constant S_NH3      [g NH3-N m-3] 
+  K_A_O:    0.5,  // saturation constant S_0        [g O2 m-3]
+  K_A_HCO:  0.5,  // saturation constant S_HCO      [mole HCO3 m-3]
+  b_A_O:    0.15, // aerobic respiration rate       [d-1]
+  b_A_NO:   0.05  // anoxic respiration rate        [d-1]
+};
+
+const STOICHIOMETRIC_CONSTANTS = {
+  // Fractions
+  f_SI:     0.,   // fraction S_I from hydrolysis   [g S_I g-1 X_S]
+  f_XI:     0.2,  // fraction X_I from decomp X_H   [g X_I g-1 X_H]
+  // Yields
+  Y_STO_O:  0.85, // aerobic yield X_STO per S_S    [g X_STO g-1 S_S]
+  Y_STO_NO: 0.80, // anoxic yield X_STO per S_S     [g X_STO g-1 S_S]
+  Y_H_O:    0.63, // aerobic yield X_H per X_STO    [g X_H g-1 X_STO]
+  Y_H_NO:   0.54, // anoxic yield X_H per X_STO     [g X_H g-1 X_STO]
+  Y_A:      0.24, // anoxic yield X_A per S_NO      [g X_A g-1 NO3-N]
+  // Composition (COD via DoR)
+  i_CODN:  -1.71, // COD content (DoR)              [g COD g-1 N2-N]
+  i_CODNO: -4.57, // COD content (DoR)              [g COD g-1 NO3-N]
+  // Composition (nitrogen)
+  i_NSI:    0.01, // nitrogen content S_I           [g N g-1 S_I]
+  i_NSS:    0.03, // nitrogen content S_S           [g N g-1 S_S]
+  i_NXI:    0.02, // nitrogen content X_I           [g N g-1 X_I]
+  i_NXS:    0.04, // nitrogen content X_S           [g N g-1 X_S]
+  i_NBM:    0.07, // nitrogen content X_H / X_A     [g N g-1 X_H / X_A]
+  // Composition (TSS)
+  i_TSXI:   0.75, // TSS content X_I                [g TS g-1 X_I]
+  i_TSXS:   0.75, // TSS content X_S                [g TS g-1 X_S]
+  i_TSBM:   0.90, // TSS content X_H / X_A          [g TS g-1 X_H / X_A]
+  i_TSSTO:  0.60, // TSS content X_STO (PHB based)  [g TS g-1 X_STO]
+  // Composition (charge)
+  i_cNH:    1/14, // charge per S_NH                [mole H+ g-1 NH3-N]
+  i_cNO:   -1/14  // charge per S_NO                [mole H+ g-1 NO3-N]
+};
+
 /**
  * ASM3 class for the Activated Sludge Model No. 3 (ASM3).
  */
@@ -17,65 +73,13 @@ class ASM3 {
      * Kinetic parameters for ASM3 at 20 C.
      * @property {Object} kin_params - Kinetic parameters
      */
-    this.kin_params = {
-      // Hydrolysis
-      k_H:      3.,   // hydrolysis rate constant       [g X_S g-1 X_H d-1]
-      K_X:      1.,   // hydrolysis saturation constant [g X_S g-1 X_H] 
-      // Heterotrophs
-      k_STO:    5.,   // storage rate constant          [g S_S g-1 X_H d-1]
-      nu_NO:    0.6,  // anoxic reduction factor        [-]
-      K_O:      0.2,  // saturation constant S_0        [g O2 m-3]
-      K_NO:     0.5,  // saturation constant S_NO       [g NO3-N m-3]
-      K_S:      2.,   // saturation constant S_s        [g COD m-3]
-      K_STO:    1.,   // saturation constant X_STO      [g X_STO g-1 X_H]
-      mu_H_max: 2.,   // maximum specific growth rate   [d-1]
-      K_NH:     0.01, // saturation constant S_NH3      [g NH3-N m-3]
-      K_HCO:    0.1,  // saturation constant S_HCO      [mole HCO3 m-3]
-      b_H_O:    0.2,  // aerobic respiration rate       [d-1]
-      b_H_NO:   0.1,  // anoxic respiration rate        [d-1]
-      b_STO_O:  0.2,  // aerobic respitation rate X_STO [d-1]
-      b_STO_NO: 0.1,  // anoxic respitation rate X_STO  [d-1]
-      // Autotrophs
-      mu_A_max: 1.0,  // maximum specific growth rate   [d-1]
-      K_A_NH:   1.,   // saturation constant S_NH3      [g NH3-N m-3] 
-      K_A_O:    0.5,  // saturation constant S_0        [g O2 m-3]
-      K_A_HCO:  0.5,  // saturation constant S_HCO      [mole HCO3 m-3]
-      b_A_O:    0.15, // aerobic respiration rate       [d-1]
-      b_A_NO:   0.05  // anoxic respiration rate        [d-1]
-    };
+    this.kin_params = KINETIC_CONSTANTS;
 
     /**
      * Stoichiometric and composition parameters for ASM3.
      * @property {Object} stoi_params - Stoichiometric parameters
      */
-    this.stoi_params = {
-      // Fractions
-      f_SI:     0.,   // fraction S_I from hydrolysis   [g S_I g-1 X_S]
-      f_XI:     0.2,  // fraction X_I from decomp X_H   [g X_I g-1 X_H]
-      // Yields
-      Y_STO_O:  0.85, // aerobic yield X_STO per S_S    [g X_STO g-1 S_S]
-      Y_STO_NO: 0.80, // anoxic yield X_STO per S_S     [g X_STO g-1 S_S]
-      Y_H_O:    0.63, // aerobic yield X_H per X_STO    [g X_H g-1 X_STO]
-      Y_H_NO:   0.54, // anoxic yield X_H per X_STO     [g X_H g-1 X_STO]
-      Y_A:      0.24, // anoxic yield X_A per S_NO      [g X_A g-1 NO3-N]
-      // Composition (COD via DoR)
-      i_CODN:  -1.71, // COD content (DoR)              [g COD g-1 N2-N]
-      i_CODNO: -4.57, // COD content (DoR)              [g COD g-1 NO3-N]
-      // Composition (nitrogen)
-      i_NSI:    0.01, // nitrogen content S_I           [g N g-1 S_I]
-      i_NSS:    0.03, // nitrogen content S_S           [g N g-1 S_S]
-      i_NXI:    0.02, // nitrogen content X_I           [g N g-1 X_I]
-      i_NXS:    0.04, // nitrogen content X_S           [g N g-1 X_S]
-      i_NBM:    0.07, // nitrogen content X_H / X_A     [g N g-1 X_H / X_A]
-      // Composition (TSS)
-      i_TSXI:   0.75, // TSS content X_I                [g TS g-1 X_I]
-      i_TSXS:   0.75, // TSS content X_S                [g TS g-1 X_S]
-      i_TSBM:   0.90, // TSS content X_H / X_A          [g TS g-1 X_H / X_A]
-      i_TSSTO:  0.60, // TSS content X_STO (PHB based)  [g TS g-1 X_STO]
-      // Composition (charge)
-      i_cNH:    1/14, // charge per S_NH                [mole H+ g-1 NH3-N]
-      i_cNO:   -1/14  // charge per S_NO                [mole H+ g-1 NO3-N]
-    };
+    this.stoi_params = STOICHIOMETRIC_CONSTANTS;
 
     /**
      * Temperature theta parameters for ASM3.
@@ -215,4 +219,4 @@ class ASM3 {
   }
 }
 
-module.exports = { ASM3, ASM_CONSTANTS };
\ No newline at end of file
+module.exports = { ASM3, ASM_CONSTANTS, KINETIC_CONSTANTS, STOICHIOMETRIC_CONSTANTS };
\ No newline at end of file