Certified by TV SD, NSF: Our filter is tested and certified by TV SD for the reduction of chlorine in water. This filter is NSF 372 certified for lead-free material. It has been tested and certified against NSF 42 to reduce chlorine, bad taste and odor.Clean and Great Tasting: The premium ion-exchange resin and granular activated carbon used are effective in reducing chlorine, taste, odor, fluoride, heavy metals and other potentially harmful contaminants in water to improve water quality and deliver fresh water, tested by a third lab.1 Months' Refreshment: For best results and continuous refreshment, its recommended to replace your filter every 1 month, which will vary based on your water quality.Replacement Model: Replacement for Brita Maxtra+, replacement for Brita jugs, Marella, Marella XL, Marella Cool, Style, Style XL, Elemaris XL, Aluna, Aluna Cool, Mavea Elemaris system and Marella system, Brita series of jugs. Also replacement for Basics, Philips, Dafi and Aquaphor jugs. Not replacement for , Aqua Optima, Laica and Levoit Jugs. This filter is not an original product.Customer Service: For detailed instruction, please kindly refer to the Instruction Manual in the box. We care about you and want you to drink only the clean water. If you have any issue about the product, please let us know. We have a quite professional customer service team and will take care of it right now.