A flask (100 mL volume) has wastewater with 0.12 mg/L geosmin. Activated carbon adsorbs geosmin as per Freundlich isotherm:
\[
Q = 2.6 \, C^{0.73}
\]
where \( Q \) is mg adsorbate/mg adsorbent, and \( C \) is equilibrium concentration (mg/L).
Activated carbon is added to reduce final geosmin concentration to 0.05 mg/L.
Activated carbon dose required is ________________ (in mg/L, rounded off to three decimal places).