Best protect filter cartridge protects your equipment by balancing minerals in the water and maintains a high pH value, the combination of which result’s in great tasting, clean water. The BWT best protect filter provides critical protection by preventing gypsum (calcium sulphate) and limescale from forming. High levels of salt in water can result in corroded machine components. This is prevented by the BWT filter by ensuring a consistently high pH value. This filter can be used horizontally or vertically.