Best Replacement Water Filters Under $100 (2026)
Selections were ranked by a value score combining compatibility, filtration capability (stages or membrane GPD), verified fit for common systems, and overall customer satisfaction indicators
The Verdict
- Best Overall: iSpring RO membrane 100 GPD replacement for under-sink systems MC1 — Best RO membrane: 100 GPD capacity for under-sink reverse-osmosis systems, ideal when dissolved solids removal matters
Top Picks
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1
Best Overall iSpring RO membrane 100 GPD replacement for under-sink systems MC1
Best RO membrane: 100 GPD capacity for under-sink reverse-osmosis systems, ideal when dissolved solids removal matters
Replacement reverse osmosis membrane for under-sink filtration. Removes contaminants and improves water taste. Customers note easy installation and good value
- removes up to 99% of contaminants
- high lead removal capability
- fits standard under-sink RO systems
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2
GE Profile filter for Opal nugget ice maker (4 pack)
Best for nugget ice makers: four-pack scale-inhibiting filters made for Opal-style machines to help reduce mineral buildup
Replacement water filter that inhibits scale and improves ice taste for the Opal nugget ice maker. Reduces chlorine taste and odor while removing VOCs, helping extend maintenance intervals
- scale-inhibiting filtration
- improves ice flavor by removing chlorine
- fits Opal nugget ice maker
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3
AqualPatrol Plus water filter cartridge for ice machines
Best for commercial ice machines: cartridge designed to protect ice machine components and reduce scale with targeted filtration
Replacement cartridge for AquaPatrol Plus systems that reduces scale and slime, improving ice machine performance. Customers note effective filtration and a cleaner ice maker
- ultrafine half micron filtration
- designed for ice machine protection
- perfect fit for AquaPatrol Plus systems
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4
AQUA CREST WF52-R Replacement for Aquasana AQ-5200R Under Sink Filter
Best budget under-sink replacement: compatible cartridge for Aquasana-style systems offering basic contaminant reduction and easy swap-in
Replacement filter for Aquasana AQ-5200R under-sink system. Reduces 99% of chlorine for better taste and odor with dual activated carbon blocks. Note: flush before use for best taste
- 99% chlorine reduction
- easy tool-free install
- compatibility with AQ-5200R
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5
ZR-001 Water Filter Replacement for 6-stage systems
Best multi-stage replacement: six-stage cartridge option for 6-stage systems and pitchers that balances broad contaminant reduction and longevity
Replacement water filters compatible with ZR-001 and related models. Provides 6-stage filtration with 0 TDS system. Some customers report the filter fits well but mixed opinions on effectiveness and longevity
- 6-stage filtration
- 8-pack value
- Wide compatibility