Deep cleaning Jerusalem stone?

I'd like some advice on using an power brush to clean our Jerusalem stone floor.  I've been using the product recommended by the installer (MarbleKare products).  I get good results on heavy stains when I apply  this product and then scrub the area with a plastic bristle brush.  However, this is very labor intensive on large areas.  Will I damage my floor if I use a power floor scrubber or power brush?  If not, what kind of pads should I be using with the power brush?

Thanks.    

Janice Rustin.