phosphate(in) + H(+)(in) <=> phosphate(out) + H(+)(out)
phosphate(in) + h(+)(in) <=> phosphate(out) + h(+)(out)
phosphate(in) + H(+)(in) <=> phosphate(out) + H(+)(out)
phosphate(in) + h(+)(in) <=> phosphate(out) + h(+)(out)