the non-solid or so-called "wet" aluminum electrolytic capacitors were and are the cheapest among all other conventional capacitors. they not only provide the cheapest solutions for high capacitance or voltage values for decoupling and buffering purposes but are also insensitive to low ohmic charging and discharging as well as to low-energy transients. non-solid electrolytic capacitors can be found in nearly all areas of electronic devices, with the exception of military applications.