Stalgast Mechanical Water Pre-Filter 820011 for Pipework Protection

A mechanical water pre-filter removes coarse particles from the water supply before it reaches sensitive equipment. It works by forcing water through a fine mesh or screen that traps sediment, rust and other contaminants. The 50 μm filtration grade stops particles larger than fifty micrometres, preventing them from clogging or damaging downstream components such as water softeners, boilers and taps. The filter is installed directly on the pipework, where it intercepts debris without altering water chemistry or flow rate.

To use the pre-filter, connect it to the incoming water line with the 3/4" fitting. Once installed, water flows through the transparent housing, allowing the operator to inspect the level of trapped dirt without dismantling the unit. When the housing shows visible accumulation, the filter element is removed, cleaned or replaced, and reinstalled. The process restores full flow and continues to protect the system.

The filter is built with a transparent housing that lets staff monitor contamination levels at a glance. The housing and internal components are sized to fit standard pipework, with an overall diameter of 84 mm and a height of 180 mm. The unit weighs 1.5 kg, making it light enough to handle during installation and maintenance.

The 3/4" connection matches common plumbing fittings in professional kitchens and water treatment systems. The 50 μm filtration grade is chosen to balance protection and flow; it stops particles that would damage resin beds in softeners while avoiding the pressure drop of finer filters. The transparent housing eliminates guesswork, showing when cleaning is needed before flow is affected.

Cleaning involves shutting off the water, unscrewing the housing, removing the filter element, rinsing it under running water and reassembling the unit. The transparent housing also helps confirm that the element is seated correctly after cleaning. No additional tools are required beyond those used for standard pipework.

The pre-filter is a single model, article 820011, designed for compatibility with all water softeners and water treatment systems that accept 3/4" pipework. It is listed in the catalogue under water treatment accessories.