When do I need to change my BioFilter filter pads for my fish pond?

BioFalls are very simple yet effective fish pond filtration systems that don't require much care.  However, spring is the perfect time to check on those filter pads to see if they may need replacing.  The filter pads are cleaned a few times a year but are quite frequently forgotten about.   What really determines if you can reuse these pads or if you should just replace them?  

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