Ceramic Dome water filter questions

I have 6 unused ceramic dome filters purchased about 3 years ago and have a couple of questions about caring for them should they be needed.

After using them and assuming they have captured Giardia, Cyclospora, E-Coli and other nasties, before using the second time, should they be cleaned?

Aside from the instructions that came with the filters, how do you do it without damaging or compromising the filter?

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Ceramic Dome water filter questions