def METHOD_NAME(self):
    m = ConcreteModel()
    m.fs = FlowsheetBlock(dynamic=False)
    m.fs.water_props = WaterParameterBlock(solute_list=["A", "B", "C"])
    m.fs.unit = DerivedDISO(property_package=m.fs.water_props)
    m.fs.unit.inlet1.flow_mass_comp[0, "H2O"].fix(1000)
    m.fs.unit.inlet1.flow_mass_comp[0, "A"].fix(10)
    m.fs.unit.inlet1.flow_mass_comp[0, "B"].fix(20)
    m.fs.unit.inlet1.flow_mass_comp[0, "C"].fix(30)
    m.fs.unit.inlet2.flow_mass_comp[0, "H2O"].fix(1000)
    m.fs.unit.inlet2.flow_mass_comp[0, "A"].fix(10)
    m.fs.unit.inlet2.flow_mass_comp[0, "B"].fix(20)
    m.fs.unit.inlet2.flow_mass_comp[0, "C"].fix(30)
    m.fs.unit.recovery_frac_mass_H2O.fix(0)
    m.fs.unit.removal_frac_mass_comp[0, "A"].fix(0.1)
    m.fs.unit.removal_frac_mass_comp[0, "B"].fix(0.2)
    m.fs.unit.removal_frac_mass_comp[0, "C"].fix(0.3)
    return m