A water treatment facility models the concentration of a pollutant that decreases each day by a factor of 0.8. On day 1, the pollutant level is 100 mg/L. The cumulative pollutant removed over all days is: $\sum_{n=1}^{\infty} 100 \cdot (0.8)^{n-1} \cdot 0.2$. What is the total pollutant removed (in mg/L)?