Berkshire Ergonomic Flat Mop Sieve | ISO 3-8 | Stainless Steel The Berkshire Ergonomic Flat Mop Sieve is a crucial component of the Ergonomic Flat Mop System, providing a robust and user-friendly solution for cleanroom mopping. Constructed from durable stainless steel, this sieve facilitates efficient wringing and solution management, ensuring optimal cleaning performance.