The Sentinel SESI is an electrolytic scale inhibitor that can provide a cost-effective solution to help tackle limescale build-up, providing an altogether more efficient system. The Sentinel SESI is an in line product, suitable for the whole house, without adding chemicals to drinking water, and can save up to £100 a year on fuel bills. The electrolytic system helps break down the hardness salts in hard water, inducing coagulation and stopping the limescale from sticking to the system. Due to it

Brand Name	Sentinel