Try running a brew cycle with just water (no filter or coffee grinds) to see if it overflows. If it still does, the issue is with the machine. If it doesn’t overflow try a different filter or a different coffee grind – Bunn recommends using OEM coffee filters to provide the best performance.

Circumstances that may cause the filter basket to overflow or the coffee maker to brew slowly include: a coffee maker that needs cleaning, excessive amounts of ground coffee, or too fine a grind. “Use slightly less grounds when brewing decaffeinated, flavored, or finely ground coffee,” she recommends.

One of the biggest causes for overflowing coffee makers is a dirty brew basket—the outer plastic tray that holds your filter and coffee grinds in place. Give that a thorough scrub, making sure that water can flow through the basket at a good rate.

While loading the basket to specialty coffee proportions for a 6-cup pot will give you the best extraction possible in your Bunn, the resulting brew may taste a bit strong. Simply dump the used grounds from the basket, reinsert the empty basket, and pour over another 6 ounces of water. Voila!

First, gently slide the empty funnel into the brewer. Second, fill the carafe with cold water, pour it into the brewer and reposition the carafe on the warmer plate with the lid closed. Wait three minutes, then fill the carafe with cold water again and repeat the process.

GRB Speed Brew Classic Coffee Maker, 10-Cup, Black BUNN BREWS DIFFERENTLY – The BUNN Speed Brew uses an internal commercial grade stainless steel hot water tank that keeps 70oz of water always hot so you can quickly brew at the flip of a lid. CLASSIC SPEED BREW look with a black finish and stainless-steel faceplate.

The temperature of the water used during extraction is a major factor in influencing how bitter (over-cooked) or weak the coffee will taste. Weak coffee can be a result of using water that has cooled too much. The ideal coffee brewing water temperature is around 195-205 degrees or about ~30 seconds off of the boil.

For decades, we’ve tested all the variables in the coffee brewing process to ensure your coffee is delicious. That’s why our coffee makers come with a recommended coffee grounds-to-water ratio of 10 tablespoons for 50oz of water.

If the coffee maker is leaking or sputtering then you should take a look at the tube connectors. Many times, a leaky coffee maker is caused by faulty tube connectors. If you find the leak is in an elbow, clean the surfaces before you replace it.

If the coffee you purchased is sub-standard, then it gets collected in the filter paper and it clogs the machine. Again, due to this blockage, the grounds basket starts to overflow. Therefore, it is really important for you to buy a good quality coffee brand that does not get clogged easily inside the coffee filter.

Bunn filters have been tested vigorously to meet FDA requirements, so you can be sure you are getting the best deal for your coffee filters. The size of bunn filters are 2.75″ x 3″ which is 6.88 cm x 7.6 cm.

This 12-cup Bunn 9 3/4″. x 4 1/4″ coffee filter is perfect for cafes and diners that are consistently brewing coffee for their patrons.