Duplicate content continues to confuse many of us. Part of the problem is there are different types of duplicate content which may be treated differently by search engines. There are different ways to deal with this in your SEO and content marketing strategy. It's important to be careful when removing content to ensure you're not shooting yourself in the foot. Instead of remove, try to improve or regroup content which is being triggered for the same query class / cluster and may be diluting. Change the emphasis and make something of added value for users. Consider query and category agnostic filtering versus content which is considered at query run-time auction in search results.