When picking a harmonic filter, one has to understand the electrical system and how it functions in order to find a suitable match. Some of the essentials are the types of loads, harmonic distortion levels and the necessary goals and objectives to be achieved. There are three types of harmonic filters including passive, active and hybrid and these are used for different applications. Fixed harmonic mitigation is the main use of passive filters whilst active filters are dynamic and vary depending on the load. It is also worth noting that the type of measure adopted has implications on power quality and also meeting regulatory frameworks.