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I am not the originator of the old content and this content gets virtually no hits. I know how to rewrite the content completely and all that.

My question is.... do I put it on new pages or old pages?

So once I have rewritten it completely and utterly, do I put it back on the old page or on a completely new one?

Thanks for the tips. I am legally taking their content. It is laterooms hotel descriptions.

No, I'm not using Blackhat.

I have done some analysis and the pages with unique content haven't been hit at all and the ones without unique content have been hit more than 60%. That is why I think it may be a content issue.

On March 3rd, the hits on my UK site crashed to 40% of the previous number. I am guessing it may be down to the google algorithm change:- http://wisestartupblog.com/seo/google-algorithm-change-february-2011-losers-winners/5081

However, I am aware this happened on 25th Feb in the US. Do you know when it happened in the UK. Could it have suddenly started affecting me on March 3?

I am looking to add new content to pages that I currently have on my website.  The content on these pages was taken from another provider and my idea is to rewrite the content to make it unique.

Because it is duplicate content, these pages don't get much traffic. Should I add the new content to brand new urls or just change the content on these (already indexed urls).

The issue has seen these pages contain duplicate content. If the content simply changes, will it recognise these pages as having unique content?