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Nowadays, passive harmonic filters are the preferred mitigation scheme for harmonics in power systems. Several types of harmonic filters are available, which are installed according to system topology and to the engineer's judgment. The purpose of this paper is to provide comprehensive information about the most common passive filters and to clarify the design and practical considerations. It compares the performance of different filters installed in a medium-voltage industrial plant. It also presents sensitivity studies on different filters and the best detuning frequencies for notch, according to harmonic distortions and components' stresses. It also conducts sensitivity studies on optimizing the detuning for notch, the quality factor, and the number of filter branches considering the cost, components' stresses and harmonic distortions.