There are three recognized modalities (methods) of electrolysis:

GALVANIC (direct current) electrolysis - the hair is destroyed by chemical action

THERMOLYSIS (high frequency) electrolysis - the hair root is destroyed by heat production.

BLEND electrolysis - a combination of the above two modalities where the hair root is destroyed by both heat and chemical action at the same time.

All three modalities are safe and effective.  As a professional I can choose the modality which is best for you.