I could be wrong but looking at this product I fail to see how it will prevent ground loop hum.
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I thought the hardwired filter may have been causing a problem.
Today I had an electrician (lived close by) who popped by. He disconnected the filter/surge protector in the electrical box.
I turned on all the audio but alas, it still had the buzz. I asked him just reconnect the filter again.
So, at least I know its 'not the filter'.
I have swapped all my components (except power amp) and still the buzz is there. That means it must be the power amp.
I will start another thread in the amp/preamp forum. I have photos of my amp and a short video of the system and buzz. I now suspect the problem stems from a Ceraphim capacitor (power) I had installed a while ago. The cap value may not be matching.