How do I fix a slow drip coffee maker?

When your drip coffee maker begins to brew slower than usual, it is almost always a sign that the machine's internal plumbing is restricted. Over time, the minerals present in your tap water—specifically calcium and magnesium—precipitate out when heated, forming scale inside the narrow tubes that transport water from the reservoir to the heating element. This buildup narrows the diameter of the pipes, forcing the pump to work harder and significantly increasing the brew time.

To address this, you must descale the machine. Fill the reservoir with a solution of equal parts water and white vinegar, or use a commercial descaling agent designed for coffee equipment. Run a full brew cycle without coffee grounds, pause the machine halfway through to let the solution sit in the pipes for 20 minutes, and then finish the cycle. Follow this with two or three cycles of plain water to ensure no vinegar taste remains.

If descaling does not resolve the issue, inspect the showerhead—the component that distributes water over the coffee grounds. Coffee oils and fine particles can accumulate here, creating a physical blockage that prevents water from flowing freely. Gently scrub the showerhead with a soft brush and warm, soapy water. Additionally, check the filter basket and the valve at the bottom; if the valve is stuck or clogged with old grounds, it will impede the flow of coffee into the carafe.

Regular maintenance is the best way to prevent these issues. If you live in an area with hard water, consider using filtered water for your brewing. This not only keeps your machine running efficiently but also significantly improves the flavor of your coffee by preventing mineral-heavy water from masking the delicate notes of your beans. A well-maintained machine should provide a consistent brew time for years.