The BWT XL 2103995 Water Filter - gives you optimal protection against scale and corrosion. The bestprotect& range improves the quality of your water, but also offers critical protection to your valuable machine technology. & For example, natural water with a high salt content may cause corrosion problems or lead to scale and gypsum deposits (calcium sulphate). & BWT bestprotect filter cartridges feature an exceptionally high quality filter medium and high-end BWT technology to provide your machine technology with the best possible protection. & & The cartridges are extremely effective in preventing scale and gypsum deposits, maintaining a constant pH value and preventing corrosion problems even with high scale content. & Use of the Bestprotect filtration range yields consistently high quality water. & It allows for:- Optimal protection against corrosion for machine technology- Prevents scale and gypsum deposits-& For all hot and cold drinks- Simple one-way system-& Exceptional filter me