Used Coffee Grounds Container

A knockbox is one of the essential elements of a barista’s work surface — without it, used coffee grounds would end up on the counter or in the sink, creating mess and clogging the drainage system. A high-quality knockbox with a sturdy knock bar absorbs the force of the tap, protects the barista’s hand and ensures precise puck disposal. BHS supplies knockbox containers to HoReCa businesses across Europe.

Types and design features of knockboxes

Countertop knockbox containers — placed on the work counter or built into a counter cut-out. Capacity ranges from 1.5 L for a small bar to 5 L for intensive café use. Built-in knockboxes — integrated into a counter cut-out, creating a clean and professional work surface. Knock bar — a horizontal metal or rubber rod in the centre, against which the portafilter is tapped. A rubber coating on the knock bar absorbs the impact and reduces noise levels. Plastic knockboxes — lighter and more affordable, suitable for small cafés with lower coffee volumes. Stainless steel knockboxes — more durable, hygienic and premium in appearance for professional cafés. Removable inner basket — for easier emptying and cleaning of the container. BHS helps choose the right type of knockbox.

Capacity and emptying frequency

The choice of knockbox capacity depends on the number of coffees served per day: 1–1.5 L capacity — suitable for a café serving up to 50 coffees per day. Emptying required every 1–2 hours during intensive use. 2–3 L capacity — the standard for a medium-sized café serving 50–150 coffees per day. 4–5 L capacity — for a large café serving 150+ coffees per day, reducing the frequency of emptying. An overfilled knockbox is a hygiene risk — wet coffee residues can develop mould. Regular emptying after each filling cycle is mandatory. A container with a drainage hole at the bottom allows water to drain, keeping the retained coffee grounds dry. BHS helps calculate the required capacity.

Hygiene and HACCP

The used coffee grounds container must be cleaned regularly — spent coffee with moisture is a breeding ground for mould. Cleaning frequency: empty after each filling cycle; wash with hot water and a disinfectant once a day. Stainless steel knockboxes are easier to disinfect than plastic alternatives. The knock bar should be checked regularly for mechanical damage — a broken or deformed knock bar can create a risk of metal fragments. The container should be replaced if it is cracked or deformed. BHS helps choose a HACCP suitable knockbox.

HoReCa usage scenarios

In a specialty café, a stainless steel knockbox next to the espresso machine ensures that used coffee grounds never end up on the counter surface or floor. The barista taps the portafilter against the knockbox once to empty it and continues working without interruption. In a high-volume café serving 200+ coffees per day, a 5 L knockbox reduces emptying interruptions — the barista can work an entire shift without stopping.

Frequently asked questions

Can used coffee grounds be disposed of in the drainage system? No — used coffee grounds are a thick organic material that clogs drainage pipes. A knockbox is the only hygienic and drainage-friendly method for disposing of used coffee grounds. The contents of a full knockbox should be discarded in the waste bin. BHS recommends a larger knockbox for intensive café use.

Which knock bar is better — metal or rubber? A rubber knock bar absorbs the impact and produces less noise — ideal for a barista zone visible to customers. A metal knock bar is more durable but creates a louder impact. Premium models with a rubber coating on the metal knock bar combine both advantages. BHS provides advice on choosing the knock bar material.

Why choose BHS?

BHS – Baltic HoReCa Solutions supplies professional equipment for restaurants, cafés, hotels and canteens: more than 20,000 products from many manufacturers. Our specialists help you choose the right equipment and spare parts for your kitchen or bar.

Delivery

We deliver across the European Union. Delivery time and cost depend on the order volume and destination — contact the BHS team for an exact price and lead time.