WYSIWYG HTML Editor and Security

Hello and thank you for taking the time to read this.

Im using a WYSIWYG HTML Editor (CKEditor) to allow the end user to use HTML. This will then be outputted at a later stage via the website. 

• Is the XSS filter from the security class (https://codeigniter.com/user_guide/libra...urity.html) sufficient enough? 
  
• Should I add additional protection such as HTML purifier?
  
• Should I use regex or strip tags to filter any unwanted tags?
  
• What's the best practice outputting data from WYSIWYG HTML Editor?
  

Thanks in Advance.