The Caleffi Dirtmag Plus 3/4″ Dirt Separator and Magnetic Filter is a specialized device used in heating systems. Its primary function is to remove impurities such as dirt, sludge, and ferrous (magnetic) particles from the circulating water in these systems. 

Features and Functions:
Dirt Separation: The device uses a mesh filter to capture non-magnetic debris such as rust, sediment, and dirt. By removing these particles, it helps maintain the system’s efficiency and prevents blockages or damage to components such as pumps, heat exchangers, and valves.
Magnetic Filtration: The Dirtmag feature includes a powerful magnet that attracts and holds iron-based particles (such as rust or magnetite), which are common in water-based heating systems due to pipe corrosion. These particles, if left unchecked, can severely impair system efficiency and cause damage to sensitive parts.
Maintenance: The unit is designed for easy cleaning and maintenance. It typically has a removable magnet and a drain valve at the bottom, allowing for the collected debris and sludge to be flushed out without disassembling the unit or interrupting system operation.
Installation: The 3/4″ sizing indicates that it fits into systems using 3/4″ pipework, and it is usually installed in-line with the system’s piping. It’s often placed on the return side of the system (before water re-enters the boiler or heat exchanger), ensuring debris is removed before it can cause any harm.