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ProOne to MaxClear: Fully Compatible

ProOne to MaxClear: Fully Compatible

Keep using what you have. Upgrade when you're ready. Everything fits perfectly.

Shop ProOne Compatible Filters

Your ProOne G2 & G3 Filters are Fully Compatible

Keep your ProOne system. Upgrade your protection.

Shop ProOne Compatible Filters

Unmatched certification for reducing total PFAS, lead, and microplastics

Certified to reduce Brand 1 Brand 2 Brand 3 Brand 4
Microplastics
Lead
Total PFAS
Chlorine
Chloramine
Pharmaceuticals
Pesticides

This table represents certified contaminant reduction. The results presented are sourced from the available certification data for BOROUX® Foundation™ Black Filters and Berkey® Black Berkey®(BB9-2) Water Filters. As of 7/15/2025 BOROUX® and Berkey® Performance Data Sheets.

MaxClear Technology filters compatible with ProOne systems

No adapters needed. No new system required. MaxClear filters fit your ProOne systems.

  • Price reduced
    Gravity Water Filter - 1 pack Gravity Water Filter - 1 pack - Hover
    MaxClear Technology

    Gravity Water Filter - 1 pack

    Compatible with most gravity filtration systems
  • Price reduced
    Gravity Water Filter - 2 pack Gravity Water Filter - 2 pack - Hover
    MaxClear Technology

    Gravity Water Filter - 2 pack

    Compatible with most gravity filtration systems
  • Price reduced
    Gravity Water Filter - 3 pack Gravity Water Filter - 3 pack - Hover
    MaxClear Technology

    Gravity Water Filter - 3 pack

    Compatible with most gravity filtration systems
  • Price reduced
    Gravity Water Filter - 4 pack Gravity Water Filter - 4 pack - Hover
    MaxClear Technology

    Gravity Water Filter - 4 pack

    Compatible with most gravity filtration systems
  • Price reduced
    Gravity Water Filter - 6 pack Gravity Water Filter - 6 pack - Hover
    MaxClear Technology

    Gravity Water Filter - 6 pack

    Compatible with most gravity filtration systems

Real Customers, Real Results

We never take shortcuts

For over 90 years, Culligan has been on a mission to provide clean, healthy, great-tasting water. We are committed to meeting the most rigorous safety standards so you can trust that our products are proven and reliable. Here's why IAPMO certification is better than third-party testing used by other brands:​

  • Highest standards

    IAPMO certification uses NSF/ANSI standards, curated to worst-case conditions so our products work for all.​

  • Ongoing certification

    IAPMO certification is renewed overtime to ensure our products are always working whilethird-party testing is only completed once and may notconform to any changes in industry standards.​

  • Real-world relevance

    Third-party testing is not monitored and could use water that is dissimilar to what you might get out of your faucet.

Shop ProOne Compatible Filters

Culligan and ProOne

As the global leader in water filtration, Culligan is dedicated to delivering safer, cleaner water for everyone, everywhere. By combining ProOne’s innovative spirit with Culligan’s 90-year legacy of water science and trusted service we can use both our strengths to bring you even better water filtration products. Over the past 18 months, we've been working diligently to create a new gravity filtration product with additional certifications: Culligan with MaxClear Technology. 

ProOne products will be available only while current inventory lasts, after which you’ll find their updated versions in Culligan with MaxClear Technology. This means the same trusted performance you know from ProOne—now backed by Culligan’s global water expertise.

As part of the transition, we’ve simplified our product lineup and will only offer our 7” filter – the most popular and versatile size – going forward. This allows us to deliver the same trusted quality with even greater consistency and performance. 

In Culligan with MaxClear™ Technology, we’ve taken your ProOne filter to the next level. The new filters still remove microplastics, lead, and total PFAS, but now they're certified to filter pharmaceuticals and pesticides too.

Yes! Culligan with MaxClear™ Technology filters are designed to fit and function seamlessly with your existing gravity system. In addition to most other branded systems like Berkey, Boroux, Purewell and Waterdrop, our new 7" filters will fit in the following ProOne devices:

  • Big+
  • Traveler+
  • Big II
  • Propur King
  • Propur Big
  • Propur Traveler
  • Propur Nomad

No. Our goal is to keep high-quality water filtration accessible for everyone. While we've introduced a new product, our commitment to balancing quality, performance, and affordability remains the same. With Culligan’s global resources and decades of water expertise, we’re proud to offer advanced filtration at a fair price—so you can continue to enjoy cleaner, safer water without paying more. 

ProOne customers now get Culligan’s best-in-class customer care team, who will provide fast help and clear solutions to any questions you may have. If you need support or have any questions about ProOne or the new Culligan with MaxClear™ Technology products, you can call us at (800) 503-2939 or email help@culligan.com.

Looking to upgrade your system?

Your ProOne filters are compatible.

  • Scout 2.25 Gallon Gravity Countertop System - Polished Stainless Steel / Starter Pack Scout 2.25 Gallon Gravity Countertop System - Polished Stainless Steel / Starter Pack - Hover
    MaxClear Technology

    Scout 2.25 Gallon Gravity Countertop System - Starter Pack

    For smaller households (1-3 people)
  • Scout 2.25 Gallon Gravity Countertop System - Polished Stainless Steel / 2 Pack Scout 2.25 Gallon Gravity Countertop System - Polished Stainless Steel / 2 Pack - Hover
    MaxClear Technology

    Scout 2.25 Gallon Gravity Countertop System - 2 Pack

    For smaller households (1-3 people)
  • Venture 3 Gallon Gravity Countertop System - Polished Stainless Steel / Starter Pack Venture 3 Gallon Gravity Countertop System - Polished Stainless Steel / Starter Pack - Hover
    MaxClear Technology

    Venture 3 Gallon Gravity Countertop System - Starter Pack

    For larger households (4+ people)
  • Venture 3 Gallon Gravity Countertop System - Polished Stainless Steel / 2 Pack Venture 3 Gallon Gravity Countertop System - Polished Stainless Steel / 2 Pack - Hover
    MaxClear Technology

    Venture 3 Gallon Gravity Countertop System - 2 Pack

    For larger households (4+ people)
  • Venture 3 Gallon Gravity Countertop System - Polished Stainless Steel / 3 Pack Venture 3 Gallon Gravity Countertop System - Polished Stainless Steel / 3 Pack - Hover
    MaxClear Technology

    Venture 3 Gallon Gravity Countertop System - 3 Pack

    For larger households (4+ people)

Ready to swap into your ProOne system

We know you're put a lot into your gravity system. That's why MaxClear Technology filters are designed to fit seamlessly into ProOne and most other gravity filter devices. With an easy swap, you'll get cleaner, healthier water you can trust - without replacing what you already own. No tools, no hassle, just simple installation.​

Learn more about MaxClear