Effective concentration
effective concentration 50 （%） （EC 50）
Median effective concentration
Median effective concentration EC50
minimal effective concentration
Minimum effective concentration
reclaiming chlorine concentration
Effective Chlorine Density
minimum inhibitory concentration and minimum bactericidal concentration
the minimum inhibitory concentration and minimum bactericidal concentration
effective lowest particle size of effective separation
[Estimated environmental concentration
2+1 two stage concentration process