Our premium descaling solution helps maintain and extend the lifespan of your tankless water heater. Use yearly to ensure your tankless water heater is operating at maximum efficiency. Highly effective descaling solution helps maintain and extend the lifespan of your tankless water heater. Use yearly to ensure your tankless water heater is operating at maximum efficiency. Dissolves mineral deposits to allow unrestricted flow and restore water circulation. Liquid solution is compatible with PVC, rubber, ABS, metal plumbing surfaces apart from magnesium and aluminium. Non-volatile, liquid solution is biodegradable, more effective than vinegar, and works well to remove both organic and inorganic materials as well as corrosion causing buildup. It's recommended to descale your tankless water heaters on a regular basis, as limescale buildup from hard water causes mineral buildup on water inlets and other components of household appliances. Easy to use and efficient, step by step instructions provided. Read all directions and safety precautions before using and prevent from using on aluminium or magnesium surfaces. Larger Gallon size provide four treatments for a tankless water heater!