Boilermag: How Does Boiler Inhibitor Work?

In the intricate world of boilers, the relentless battle against scale, corrosion, and inefficiency persists. Enter the unsung hero: the boiler inhibitor.
 
As a vital component of water treatment in boiler systems, the boiler inhibitor safeguards against the insidious effects of scale formation and corrosion (rust) which can link with dirt and other debris to create a thick sludge. That messy sludge can over time build up to start creating blockages which may result in system inefficiencies and even longer-term permanent damage.  But how does boiler inhibitor work to protect boilers and central heating systems?