<math> Q_{t\ddot{a}glicher\ Ertrag} = 4\ \times \left (\dfrac{40\ \frac {l}{PE}}{Dusche, Badewanne, Handwaschbecken} + \dfrac{13\ \frac {l}{PE}}{\mathit{Wa}schmaschine} \right ) = 212\ \frac{l}{Tag} </math>
Q d a i l y y e a l d = 4 × ( 40 L p e r s o n s h o w e r , b a t h s , s i n k s + 13 L p e r s o n w a s h i n g m a c h i n e ) = 212 L d a y {\displaystyle Q_{daily\ yeald}=4\ \times \left({\dfrac {40\ {\frac {L}{person}}}{shower,baths,sinks}}+{\dfrac {13\ {\frac {L}{person}}}{{\mathit {wa}}shing\ machine}}\right)=212\ {\frac {L}{day}}}
