Though I don’t drink coffee, I know many people who do. For decades, I just assumed that of course one had to use paper coffee filters in the coffee maker. When I bought coffee makers for my rental rooms, I became aware of the existence of permanent, metal, coffee filters. Some coffee makers on Amazon.com come with the permanent filter in them. You can also buy them separately.
No more having to buy filters over and over and throw them away. The metal filters are easy to wash and very effective, and they last for years.