Our Conditioning Balanced Power Supplies’ CBS1500 and CBS2000 include a mains filtering component and a level of conditioning using a varistor.
There many different ideas as to what a main conditioner provides but our mains conditioner circuit removes transient spikes by using VDR’s (varistors); in addition to the RFI suppression.
The simplest explanation of a mains filter is that the filter will let the basic 50Hz mins waveform through with the minimum of attenuation, whilst all other unwanted (usually high) frequencies are attenuated. The filter acts in two modes: it attenuates differential-mode (asymmetrical) noise (noise on either the neutral or live) & common-mode (symmetrical) noise (identical noise on both the neutral & the live).
The electrostatic screen also attenuates high frequency noise by reducing the capacitance between primary & secondary windings.