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cheersI got two filters with media second hand. First was from a friend and all I did was use a pipe brush to clean the pipes (trusted him regarding the media). Second from ebay, the pipes were too small so I got new ones but the supplied bio media and ceramics got a soak in boiling water along with the sponges. Rinsed in cool water then some replaced media from the first filter to help cycle the second.
Not sure if it was needed but it put my mind at ease and hasn't seemed to effect the media in any way.