Purewell 8-Stage PF-3 & FL-2 Replacement Filtration Elements Set — ProOne Big+/Berkey Big+ Compatible (4-Pack, K Series)

Overview

Purewell offers replacement purification elements designed for gravity-fed filtration systems. The 8-Stage PF-3 & FL-2 set is compatible with ProOne Big+ and Berkey Big+ models, as well as Purewell gravity units. The design emphasizes a precise fit to minimize leaks, providing a straightforward maintenance experience for everyday use.

What this filtration kit includes

This 4-pack brings four purification elements designed to work together for reliable performance across compatible systems.

• Two white fluoride reduction filters
• Two black activated carbon filters
• Part of the Purewell K Series replacement elements

How the filtration works

The kit features an 8-stage filtration path. The core uses a 0.01 μm hollow-fiber UF membrane paired with a silver ion membrane and an activated carbon block to target rust, sediment, organic matter, and heavy metals. The fluoride reduction stage employs a dedicated membrane, additional carbon block, and three sediment PP membranes to intercept fluoride and chlorine. These elements are NSF/ANSI 42 certified for performance reliability.

• 8-stage filtration for multi-layer protection
• 0.01 μm UF membrane for fine particle capture
• Silver ion membrane adds a hygienic layer of protection
• Activated carbon block reduces tastes and odors
• Dedicated fluoride reduction stage addresses fluoride and chlorine

Fluoride reduction and materials

The fluoride filters use advanced fluoride reduction material rather than standard activated alumina, helping reduce fluoride by up to 90% and meeting lead-free material standards (NSF/ANSI 372). This supports safe, reliable daily use without releasing substances when soaked.

• Fluoride reduction up to 90%
• Lead-free components meet NSF/ANSI 372

Longevity and maintenance

Two fluoride filters and two carbon filters are designed for relatively high-volume use, with lifespans that vary by water quality. Replacement every 6 months is recommended for optimum performance. Note: these filters do not lower TDS.

• Fluoride filters: up to 1,000 gallons
• Carbon filters: up to 6,000 gallons
• Replace roughly every 6 months for best results

Installation and support

Follow the pre-filtration steps in the manual for best results. If you experience clogging, slow flow, or unusual odors, Purewell offers a free, quick replacement service to ensure your setup fits your system.

Brand note

Purewell is an independent brand, and these filters are not sponsored by Berkey or ProOne. This set provides replacement elements for compatible systems and the Purewell gravity filtration line.