Furman solves ground loop issue?

I have a serious ground loop problem with my analog side. Digital is dead quiet.
Loud hum comes from the speakers when analog input is turned on.
Becomes louder when I increase gain.
A salesman said that if I plug my analog components into a Furman PL-PLUS C - 15A w/Voltmeter 
this would solve the problem.

Have tried all the usual methods-cheater plugs, transformers, using another circuit, grounding with copper wire, switching interconnects, but nothing works.
Something is going on between the pre and the phono stage. Tried a different make phono stage and the problem is still there.
Have spoken with people with all brands involved and nobody could help me.

Anybody have any experience with this product? Would it solve this hum problem?

Thank you