This is a new unopened bottle of 100 milk system cleaning tablets. Manufactured in 2020.

Some information from online:

BUNN MILK RINZA ACID 100 TABLETS (4/CS) (MCD) (51690.0000) is a premium cleaning solution specifically designed for BUNN coffee machines, ensuring optimal hygiene and longevity of your equipment. Each package contains 100 acid-based tablets that effectively remove milk residues, calcium deposits, and other stubborn build-ups from milk frothing systems. Perfect for commercial and high-use environments, these tablets help maintain consistent milk flavor quality and prevent cross-contamination, delivering a superior coffee experience every time.

Crafted for easy and efficient maintenance, the MILK RINZA ACID tablets dissolve rapidly in the cleaning cycle, providing thorough cleaning without the need for harsh scrubbing or disassembly. Their acid formulation targets and breaks down tough milk proteins and mineral scale that conventional cleaners cannot eliminate. By integrating these tablets into your regular cleaning routine, you extend the lifespan of your BUNN coffee machine components, reduce downtime due to maintenance, and uphold health and safety standards, crucial for busy cafés and restaurants.