diff --git a/brew/water_optimizer.m b/brew/water_optimizer.m
index 0d00418..d6c4391 100644
--- a/brew/water_optimizer.m
+++ b/brew/water_optimizer.m
@@ -43,15 +43,9 @@ M_MgSO4  = create_mol([i_Mg i_S i_O], [1 1 4], mol_masses)
 M_NaHCO3 = create_mol([i_Na i_H i_C i_O], [1 1 1 3], mol_masses)
 M_H20 = create_mol([i_H i_O], [2 1], mol_masses)
 
-m_CaSO4 = sum(M_CaSO4)
-
+# ignore oxygen
 mask = create_mol([i_Ca i_Mg i_S i_Cl i_Na], [1 1 1 1 1], mol_masses) > 0
 
-m_empty = create_mol([], [], mol_masses)
-
-molare_masse_H2O = sum(M_H20)
-
-
 T = create_mol([i_Ca i_Mg i_Na i_S i_Cl], [0.05 0.01 0.02 0.05 0.10], mol_masses)
 A = create_mol([i_Ca i_Mg i_Na i_S i_Cl], [0.094 0.018 0.004 0.044 0.005], mol_masses)
 A = 0*T