<math> Q_{t\ddot{a}glicher\ Beda\mathit{rf}} = 4\ \times \left (\dfrac{25\ \frac {l}{PE}}{Toilette} + \dfrac{13\ \frac {l}{PE}}{\mathit{Wa}schmaschine} + \dfrac{5\ \frac {l}{PE}}{Reinigen} + \dfrac{5\ \frac {l}{PE}}{Bew\ddot{a}sserung} \right ) = 192\ \frac{l}{Tag} </math>
Q d a i l y n e e d = 4 × ( 25 L P e r s o n t o i l e t + 13 L p e r s o n w a s h i n g m a c h i n e + 5 L p e r s o n c l e a n i n g + 5 L p e r s o n i r r i g a t i o n ) = 192 L d a y {\displaystyle Q_{daily\ need}=4\ \times \left({\dfrac {25\ {\frac {L}{Person}}}{toilet}}+{\dfrac {13\ {\frac {L}{person}}}{{\mathit {wa}}shing\ machine}}+{\dfrac {5\ {\frac {L}{person}}}{cleaning}}+{\dfrac {5\ {\frac {L}{person}}}{irrigation}}\right)=192\ {\frac {L}{day}}}
