Drew Frohn, a wholesale manager and coffee educator for Coava Coffee Roasters, once told HuffPost that a good cup of coffee starts with water quality. Considering that coffee is 98% water, that’s important to know. However, it doesn’t matter how hard or soft or filtered your water is: Over time, your coffee maker can get a layer of limescale (or build up of calcium carbonate) caked onto its insides and parts, whether that’s a brew basket, Keurig, coffee pot, Chemex or even your favorite mug. That’s no bueno when you want that perfect cup of Joe, as it’ll affect flavor and your coffee maker’s brew efficiency.

A clean coffee machine is key to making some good brew.

If you’ve been dissatisfied with the quality of your coffee lately, consider the fact that it may not you, the beans, your measurements or your water. It could just be your machine’s cleanliness.

Take it from one reviewer who swears these Active coffee maker cleaning tablets made for a better brew.

“Lately, I’ve noticed it had a much more staler taste to my coffee and wasn’t sure why it wasn’t tasting as good,” they say. “After I filled the reservoir with water, I dropped in a tablet and let it sizzle away. […] The water came out light brown and you could see the amount of build up that was inside the reservoir disappear. After brewing my first new pot of coffee, it was like a brand new machine. […] After the cleaning, these coffees tasted so much better!”