Any positively offset frequency kills all bacteria, viruses and parasites simultaneously

Any positively offset frequency kills all bacteria,viruses and parasites simultaneously

given sufficient voltage (5 to 10 volts), duration (seven
minutes), and frequency (anything from 10 Hz to 500,000 Hz).

Before this I had always set my commercial frequency generator
to alternate between positive and negative voltage. Now I
tried setting it to alternate between positive and zero voltage
(positive offset). It was just as effective as the battery operated
frequency generator my son designed.