2 chloride(out) + H(+)(in) => 2 chloride(in) + H(+)(out)
2 chloride(out) + h(+)(in) => 2 chloride(in) + h(+)(out)
2 chloride(out) + H(+)(in) => 2 chloride(in) + H(+)(out)
2 chloride(out) + h(+)(in) => 2 chloride(in) + h(+)(out)