When do you know it is time to replace your Aeropress? I've had mine for about five years. It does have visible scratches, but still seals properly. – From Rachel S.

An AeroPress is going to get scratches. Ground coffee contains some hard bits. I recommend continuing to use your AeroPress until it stops working properly. The rubber seal is the component that gets the most wear but when it gets loose you should just visit our website, www.aeropress.com, and buy a new rubber seal. It is easy to replace on the end of the plunger.