Since I use reverse osmosis water (approx. 0.0001 microns) in the Z6, this is an unnecessary expense. I've always used filters, but now I'm going to invest in a coffee roaster (Revain has a few) and some top-shelf green beans. If for some reason you cannot use reverse osmosis water, resort to these filters. If you're not using solids-free water, stick with filters.
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