Best Under-Counter Water Filters Comparison (2026)

Expert comparison of the top 5 under-counter water filters for microplastics and PFAS removal. All products listed are NSF-certified (verify the exact model on the NSF website). Performance claims are based on independent lab testing by organisations such as TechGearLab and NSF International.

Independently Verified

Expert Reviewed

•Last Updated: January 15, 2025

🌍Did you know? A home filter eliminates ~1,500 plastic bottles per year. Read more →

Filter by Contaminants Removed

Select specific contaminants to find filters that remove them. Common concerns include PFAS, microplastics, lead, and chlorine.

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Showing 5 of 5 products

Best Overall

iSpring RCC7

by iSpring

★★★★★

94/100

Expert Score

Key Specifications

Price:: £199.99
Filter Replacement:: £79.99
Filter Lifespan:: 12 months
Water Flow:: 0.36 GPM
Installation:: Moderate

Certifications:

NSF/ANSI 58WQA Gold Seal

Contaminants Removed

MicroplasticsPFASLeadArsenicFluorideBacteriaViruses

Pros

• Certified for microplastics reduction (NSF 58)
• Comprehensive contaminant reduction
• Long lifespan

Cons

• Higher cost
• Slower flow
• Complex installation

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Top Rated

Clearly Filtered 3-Stage

by Clearly Filtered

★★★★★

94/100

Expert Score

Key Specifications

Price:: £179.99
Filter Replacement:: £39.99
Filter Lifespan:: 6 months
Water Flow:: 0.5 GPM
Installation:: Easy

Certifications:

NSF/ANSI 42NSF/ANSI 53PFAS Tested

Contaminants Removed

PFASLeadMicroplasticsChlorineVOCsFluoride

Pros

• High PFAS reduction (according to TechGearLab testing)
• Microplastics reduction
• Affordable

Cons

• Slower flow
• Frequent changes
• Smaller brand

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Hydroviv Custom

by Hydroviv

★★★★★

93/100

Expert Score

Key Specifications

Price:: £249.99
Filter Replacement:: £59.99
Filter Lifespan:: 6 months
Water Flow:: 0.5 GPM
Installation:: Easy

Certifications:

IAPMO CertifiedNSF/ANSI 42NSF/ANSI 53

Contaminants Removed

PFASLeadChlorineVOCsCustomized

Pros

• Customized to your water
• PFAS removal
• Shark Tank featured

Cons

• Higher cost
• Requires testing
• Longer delivery

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Aquasana AQ-5200

by Aquasana

★★★★★

92/100

Expert Score

Key Specifications

Price:: £189.99
Filter Replacement:: £49.99
Filter Lifespan:: 6 months
Water Flow:: 0.5 GPM
Installation:: Easy

Certifications:

NSF/ANSI 42NSF/ANSI 53NSF/ANSI 401

Contaminants Removed

ChlorineLeadVOCsTaste & OdorSediment

Pros

• Affordable
• NSF certified
• Easy installation

Cons

• No PFAS removal
• Slower flow
• Frequent changes needed

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Waterdrop 10UA

by Waterdrop

★★★★★

85/100

Expert Score

Key Specifications

Price:: £59.48
Filter Replacement:: £39.99
Filter Lifespan:: 6 months
Water Flow:: 2.0 GPM
Installation:: Easy

Certifications:

IAPMO R&T tested against NSF standards

Contaminants Removed

PFAS (93%)ChlorineVOCsSediment

Pros

• 93% PFAS removal (TechGearLab verified)
• Great taste improvement
• Budget-friendly

Cons

• Only 3.8% lead removal
• Not effective for heavy metals
• Not NSF certified (IAPMO tested)

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Comparison FAQ

Common questions about choosing the best under-counter water filter for your home

Which filter is best for removing PFAS and microplastics?

For PFAS: Waterdrop 10UA reduced PFAS by 93% according to TechGearLab testing, at a budget price. For broader contaminant reduction: iSpring RCC7 reverse osmosis is NSF 58 certified for comprehensive contaminant reduction including PFAS and microplastics. Note: The Waterdrop 10UA is IAPMO tested (not NSF certified) and is not effective for lead reduction (only 3.8% according to TechGearLab).

What's the difference between carbon filters and reverse osmosis?

Carbon filters (like Aquasana AQ-5200 and Waterdrop 10UA) use activated carbon to reduce chlorine, VOCs, and improve taste. They're more affordable and faster flow. Important: Carbon filters are not designed for lead reduction (TechGearLab testing showed only 3.8% for Waterdrop 10UA). Reverse osmosis systems (like iSpring RCC7) use a semi-permeable membrane to reduce a wide range of contaminants including lead, PFAS, microplastics, bacteria, and viruses (certified to NSF 58). RO is more comprehensive but slower and more expensive.

How much do replacement filters cost annually?

Annual filter costs range from £79.98 (Waterdrop 10UA at £39.99 every 6 months) to £159.98 (iSpring RCC7 at £79.99 every 12 months). Consider both initial cost and ongoing maintenance when budgeting. The Waterdrop 10UA offers the best value with low replacement costs and excellent performance.

Can I install an under-sink filter myself?

Most under-sink filters (Aquasana, Waterdrop, Clearly Filtered, Hydroviv) are designed for DIY installation and take 30-60 minutes. The iSpring RCC7 reverse osmosis system is more complex and may require professional installation. All products include detailed instructions and customer support.

Need More Information?

Read our in-depth expert reviews with detailed testing methodology, performance analysis, and installation guides.