Yes, the K-Slim coffee maker has a spot for a charcoal water filter located at the bottom inside of the machine’s rear water reservoir. The Keurig Slim uses charcoal water filter cartridges measuring about 2 inches long and 1.12 inches tall. This small charcoal filter sits inside a BPA-free, clear plastic filter handle (sometimes sold separately from the brewer), which is then placed inside the water tank located behind the brewer.
To install the water filter on the K-Slim coffee maker, insert the charcoal water filter into the bottom of the tall plastic handle attachment. Then, reattach the bottom piece to secure it into place. Place the filter handle into the Keurig Slim’s rear water tank, aiming directly over the black plastic inlet at the bottom of the reservoir. Push down to securely snap the filter holder into place.
The K-Slim brewer fits the Tall Handle Water Filter Holder. This water filter handle attachment is about 8 inches tall and is designed to install inside your Keurig K-Slim (K900) machine’s water tank.
The Keurig K-Slim brewer uses these Charcoal Water Filter Cartridges. The size of these charcoal water filters are designed to be installed inside the water filter holder, which is placed inside the Slim coffee machine’s rear water tank reservoir. The water filters measure only a couple inches long and fit the K900 brewer model.
The answer is ultimately a personal choice, as everyone’s water quality differs. I typically recommend the use a water filter to improve the quality and taste of your coffee, and to help protect your Keurig K-Slim brewer against scale buildup from minerals in your water. You might especially want to use a water filter if you notice bad tastes, such as from chlorine, scale or other minerals.
You should change your Keurig K-Slim or K900 brewer’s charcoal water filter once you’ve brewed about 1,000 fluid ounces through your machine. This equates to 125 eight ounce cups of coffee, or about every 2 months. After replacing your Keurig Slim coffee maker’s water filter, you should set a change water filter reminder.
The Keurig Slim machine fits the My K-Cup Universal Reusable Coffee Filter. You can use this accessory attachment to brew your own coffee in the K-Slim K900 coffee maker as if you were using a refillable K-Cup pod. This coffee filter is reusable and you can use it to brew your own ground coffee.