• Simple installation procedure.
• Prevents scale formation on all critical heat surfaces.
• Lasts 12 months between cartridge changes.
• Cartridge change indicator.
• interactive sentinel problem solver

The Sentinel Combiguard unit provides protection for domestic hot water systems from the effects of scale deposition.
It works by proportionally blending a minute amount of polyphosphate into the system water.
The polyphosphate suspends the hardness salts thus preventing them from forming scale. The effect is permanent and therefore storage tanks, cylinders, etc. can all be effectively treated. The polyphosphate ingredient is totally safe for use in domestic supply water.