What is the recommended additional step when cleaning a cask draft system?

Flushing clean through the line between each cask is considered the recommended additional step when cleaning a cask draft system because it ensures that any residual beer or contaminants are thoroughly removed from the entire draft line system. This step addresses the potential for cross-contamination when switching between different casks, especially if they contain different styles or flavors of beer. By flushing the lines, you help maintain the integrity and quality of the beer being served.

While flushing with cold water might seem effective, it does not specifically address the deeper cleaning needed between different casks, which is crucial for maintaining flavor integrity. Using a stronger cleaning chemical might be inappropriate if not correctly measured and could potentially damage the lines or leave unwanted residues. Cleaning only after service hours might not ensure comprehensive maintenance between service times, especially in busy establishments where multiple casks are used throughout the day. Thus, the continuous cleaning flush through the line is essential for optimal draft quality.