Are there differences in quality in different types of PET?

There are clear differences in quality and purity of PET materials. Gerolsteiner only uses high-quality PET. The PET we use also has acetaldehyde blockers, which ensure that acetaldehyde molecules remain bound in the material and cannot pass to the product. This contributes considerably to the quality and safety of our mineral water, as confirmed by independent tests. (See below for more information on acetaldehyde).