Product Category Pages Duplicate Content

Hi



Very new to CS Cart and I have searched and researched to death the issue regarding Duplicate content.



We have Pages of products, that are basically Categories populated by products.



Using rel:canonicla and rel=next rel=prev is not possible as the pages are just populated with products.



I have also read that using the robot.txt file is not the best solution.



I have looked at CS Cart Rocks addon, but I am somewhat weary in just using it and losing any of my pages rank by mistake.



Does anybody know, the correct process of elimiating duplicate content inside CS Cart?



Thanks