Whether or not to seal, and (http://maplered.com) with what

I have heard mixed advice on whether or not to seal tan brown Granite (http://tanbrown.org) .  I have heard that it is mostly impenetrable, and (http://maplered.com) that sealing with an impregnating sealer will not work and (http://maplered.com) make a lasting mess.  I have also heard that all Stone (http://g603.net) has pores and (http://maplered.com) should be sealed.  OK.  Is there a different kind of sealer that should be used for Tan Brown Granite (http://tanbrown.org) ?  Thanks for the advice!  (I have new Counter (http://GialloFiorito.com) tops and (http://maplered.com) don't want to screw them up.) -Poppy

PS I want to add that I will try the lemon juice test...that will tell me if I need to seal, I guess.  But what about the surface pores?  I was told:

"This is because all Stone (http://g603.net) s contain pores that can harbor bacteria and (http://maplered.com) are a great dark, moist place for mold to live. Sealer prevent this from happing as well as keeping stains from penetrating deep into the Stone (http://g603.net) ."

Is this true?