The return circuit to the boiler is the ideal location for the Smart Mag system filter, which is simple to install. This makes it possible to catch debris that has already entered the pipes before it gets to the boiler, especially while flushing the system. It is imperative that the filter chamber is positioned vertically, with the drain valve situated at its base. The universality of the valves lies in their ability to be connected both vertically and horizontally, but they always need to follow the directional flow arrow.