Cold brew tower glass

A cold brew tower is a glass device that drip-brews coffee at cold temperatures, yielding a smooth, concentrated beverage with up to 70% less acidity.

About this subject

A cold brew tower is a coffee extraction method that uses cold or room-temperature water, slowly dripping it over coarsely ground coffee. The process takes 8 to 24 hours, resulting in a less acidic, smoother beverage compared to traditional hot coffee. The equipment consists of an upper glass container that releases controlled droplets, a central funnel holding the coffee grounds, and a collector at the base.

The cold extraction technique originated in Japan during the 17th century, but gained global popularity in the early 2000s, especially among specialty coffee shops. The glass tower, besides being functional, offers visual appeal and is often found in modern establishments as a decorative and interactive element. By 2026, the 'cold brew tower' trend consolidates as a symbol of innovation and quality in coffee preparation.

Interesting facts: the tower produces a concentrate that can be refrigerated for up to two weeks without flavor loss. The typical ratio is 8 parts water to 1 part coffee grounds. The result is a concentrate that can be diluted with water, milk, or ice. Borosilicate glass is the preferred material among manufacturers, as it withstands temperature variations and does not affect the taste.

The tower also allows variations: baristas can adjust the drip rate to control extraction, and some models incorporate paper or metal filters. Regular cleaning is essential to maintain flavor purity.

Frequently Asked Questions

How long does it take to brew coffee in a cold brew tower?

The process takes 8 to 24 hours, depending on the drip rate and recipe. Slower dripping results in a more concentrated and smoother extract.

Is a glass cold brew tower difficult to clean?

Yes, it requires care. Disassemble the parts and wash with warm water and mild detergent. Borosilicate glass is dishwasher-safe, but hand washing is recommended to prevent breakage.

What is the difference between cold brew and traditional iced coffee?

Cold brew is extracted with cold water, without heat, resulting in lower acidity and bitterness. Traditional iced coffee is brewed hot then cooled, which retains natural acidity.