About This

• 【Universal Compatible Models】 Purewell square activated carbon filter is a direct replacement for ProOne Big+ / Big II and Berlkey BB9-2 black filters. Compatible with Berlkey Travel, Big, Royal, Imperial, Light, and Crown Series, as well as the Purewell Gravity-Fed Water Filter System. Precision-engineered tight seal ensures leak-free installation and connects easily with Fluoride or Alkaline Filters for multi-stage purification. Note: Not affiliated with or sponsored by Berlkey or ProOne. Purewell is an independent water purification brand.
• 【Advanced 4-Stage Filtration】 Certified by NSF/ANSI 53, our composite filter features advanced 4-stage filtration technology, including a 0.01μm hollow fiber ultrafiltration membrane, Hybrid Media, a silver ion barrier and high-density activated carbon block. This powerful system eliminates microplastics and removes 99.9% of chlorine, rust, sediment, organic compounds and heavy metals, while removing >99.36% of forever chemicals (PFAS). Compliant with NSF/ANSI 372 lead-free standards, it guarantees safe and reliable filtration for daily use.
• 【Innovative PFAS Removal Technology】 Target the contaminants that matter most. This advanced composite filter is engineered with high-performance filtration media to remove >99.34% PFOA, >99.74% PFOS, and over 99.9% of chlorine and heavy metals—helping reduce harmful “forever chemicals” and exceeding rigorous industry standards. Unlike conventional filters with limited performance, its advanced multi-layer design delivers superior contaminant reduction while retaining essential minerals for better taste.
• 【Extended 2-Year Lifespan】 Designed for long-term, reliable performance, each square activated carbon filter delivers up to 10,000 gallons of purified water, while a pair provides up to 20,000 gallons total—lasting up to 2 years depending on water quality and daily use. With a filtration surface area over 2 larger than standard carbon filters, it maximizes water-media contact for more efficient purification, stable flow, and longer-lasting, high-performance filtration with fewer replacements.
• 【Cost-Effective Hydration Solution】 Each Purewell replacement water filter can replace up to 75,000 single-use plastic water bottles, helping you significantly reduce bottled water expenses over time. Designed for long-lasting performance and consistent filtration, it delivers reliable, high-quality water for the whole family. Enjoy dependable daily hydration with a durable filter built for efficiency and professional-level purification. Note: TDS levels do not fully reflect water quality, and this filter is not designed to reduce TDS.

Overview

• Material : Acrylonitrile Butadiene Styrene (ABS), Activated Carbon, Polyester, Polypropylene (PP)
• Product Dimensions : 4"D x 6"W x 9"H
• Item Weight : 2.1 Pounds
• External Testing Certification : NSF
• Product Benefits : Reduce Chlorine and PFAS (Forever Chemicals)