diphosphate + H2O + H(+)(in) <=> 2 phosphate + 2 H(+)(out)
diphosphate + h2o + h(+)(in) <=> 2 phosphate + 2 h(+)(out)
diphosphate + H2O + H(+)(in) <=> 2 phosphate + 2 H(+)(out)
diphosphate + h2o + h(+)(in) <=> 2 phosphate + 2 h(+)(out)