There it is a common misunderstanding that all electrostatic filtration is the same. There are two basic types of electrostatic filtration. One is electrostatically charged filter media, and the other is an electrostatic precipitator. Electrostatic media is created by giving a normal filter and electrostatic charge. The electrostatic charge may increase the filters ability to capture certain particles. These filters are disposable and do not fit into the HEPA vs Electrostatic comparison
An electrostatic precipitator is a metal filter which has two stages. The first stage is the ionizing section. Here are particles are given electrostatic charge. The particles then moves through the collection area where the particles are deposited on aluminum plates. The trapped particles are washed away with regular maintenance. In your comparison use electrostatic precipitators.