A power source and methods thereof includes a structure comprising one or more p type layers, one or more n type layers, and one or more intrinsic layers and at least one source of radiation is disposed on at least a portion of the structure. The preparatory phase of gravitational sedimentation is followed by main treatment consisting of electrocoagulation, electrooxidation and electroflotation through action of metal electrode sets made of inox, steel and aluminium respectively, with parallel disinfectionoxidation with ozone, UV irradiation and ultrasonic treatment, as well as recirculation in the electromagnetic field. A user can provide configuration information through the configuration templates. The air duct has an inlet port receiving a flow of room air, and an outlet port. The subscription matcher determines precedence between any overlapping subscribed and unsubscribed topics and topic sets based on the sequence in which they were stored. It also comprises an amplitude estimating unit for estimating the amplitude of the signal and a decision unit which is connected downstream of the amplitude estimating unit and the correlation unit, for deciding about the presence of the periodic signal.