def METHOD_NAME(m, **kwargs):
    """
    build an RO
    """
    assert not kwargs["has_desal_feed"]
    property_models.build_prop(m, base="ion")
    feed_block.build_feed(m, base="ion")
    property_models.build_prop(m, base=kwargs["RO_base"])
    translator_block.build_tb(
        m,
        base_inlet="ion",
        base_outlet=kwargs["RO_base"],
        name_str="tb_pretrt_to_desal",
    )
    m.fs.s_pretrt_tb = Arc(
        source=m.fs.feed.outlet, destination=m.fs.tb_pretrt_to_desal.inlet
    )
    property_models.build_prop(m, base="eNRTL")
    desal_port = build_components(m, **kwargs)