It's an inexpensive reusable coffee filter that fits any Keurig-brand at-home coffee machine, so you can use it however many times you want without guilt or going to a coffee shop. And it's easy ...

Ironically, even Keurig, maker of the original K cup, is making and selling a Keurig brand reusable filter for its Keurig ...

If that first delicious cup of coffee from your Keurig is now only a distant memory, dissolved in murky flavors and sluggish ...