This installers kit contains every one of the products needed to achieve compliance with the Domestic Building Services Guide for efficiency, system circulation, hot water storage and system preparation for domestic central heating systems. Both the Inhibitor and Cleanser provided treat 100 Litres – a typical central heating system. Kit Contents: · 22mm Magnetic Filter · 15mm Electrolytic Inline Scale Inhibitor (Wras approved) · 500ml Buildcert Inhibitor · 500ml Cleanser