What does potassium permanganate mean in practice?
KMnO4 provides a strongly oxidizing manganate(VII) ion, and the dose must correspond to the water demand or medium regeneration.
When does it matter?
It is a hazardous and coloring agent; excess may appear in treated water as a pink color.
Which solutions are related to it?
It is stored and dosed according to the safety data sheet, compatible materials are used and the lack of oxidant after the filter is controlled.