Best Replacement Under-Sink Water Filters Under $100 (2026)
We scored replacements under $100 by value using factors including media type, micron rating, cartridge length, compatibility with common housings and RO systems, user ratings, and pack size
This roundup covers replacement under-sink water filters priced under $100, focused on sediment, carbon, and RO pre-filter cartridges that restore filtration performance and water taste. Selections emphasize filter media, micron rating, cartridge length, and user-rated value to identify options that balance performance and cost
Top Picks
-
1
PUREPLUS 5 Micron 10" x 4.5" Whole House Filter Cartridge
5-micron replacement filter cartridge for whole-house systems. Reduces chlorine, sand, and rust for cleaner water; easy to install. Customers note good quality and value for money and improved water feel
- multi-model compatibility
- effective chlorine reduction
- certified materials
-
2
APEC pre-filter set for Essence RO system (2-pc) 10 inch
Two 10-inch pre-filters for APEC Essence RO systems, including sediment and carbon blocks to protect the RO unit and improve water quality. Customers note easy installation and compatibility with under-sink and refrigerator hookups
- high capacity 10 inch filters
- multi-stage filtration
- easy installation
-
3
PurePlus 5 Micron 20" Sediment Whole House Filter
Whole house sediment pre-filter with multi-layer density tech (5/7/10 micron). Improves water clarity and taste; noted for easy installation and efficiency in city water
- Five-micron inner layer for sediment capture
- Three-layer PP design extends filter life
- Complies with food-grade and regulatory standards
-
4
APEC ESPH Replacement Filter Set for Essence RO System
Replacement filter set for APEC Essence RO systems, stages 1-3 & 6 with sediment and carbon block filters. Easy to install and compatible with ROES-PH75, delivering improved water quality
- includes 1st stage sediment filter
- 2nd/3rd stage carbon block filters
- high-capacity replacement set
-
5
Waterdrop RF10-MZ Replacement Filter Cartridge for 10UB-MZ/10UA/10UB
Remineralization replacement filter for under-sink systems, balancing microelements with natural media. Customers note easy installation and improved water taste and quality
- remineralization to balance minerals
- natural media filtration
- enhanced water taste
-
6
PUREPLUS 5 Micron Whole House Sediment Filter (2-Pack) 10 x 4.5
Whole house sediment filter cartridge for well water. Reduces sediment, sand, and rust while fitting whole-house systems. Customers report easy installation and good value for money
- 5 micron filtration
- well water suitability
- food-grade, BPA-free certified
-
7
Membrane Solutions 150 GPD RO Membrane 12" x 2"
150 GPD RO membrane for undersink filtration with 97% salt rejection and 0.0001-micron TFC layer. Improves water quality and taste; customers report easy installation and good fit
- high-permeate 150 GPD
- strong impurity reduction
- easy-install for quick replacement
-
8
Membrane Solutions 5 Micron 10"x2.5" String Wound Sediment Filter Cartridge
5 micron string-wound sediment cartridge for whole-house filtration. Improves sediment removal and flow in standard systems. Users note easy installation and durable performance
- food-grade, BPA-free material
- high dirt-holding capacity
- improved flow rate
-
9
DGD-5005 Big Blue 10 in Sediment Filter Cartridge (2-pack)
Replacement sediment filter cartridge, 10" x 4.5", 5 micron, dual-gradient density polypropylene. Reduces dirt, sand, silt without taste, odor, or color. Customers note effective sediment removal for well water
- dual-gradient density filtration
- NSF-certified for particulate reduction
- compatible with 10" x 4.5" housings
-
10
PUREPLUS 5 Micron 10" x 2.5" Sediment Filter Replacement
5-micron sediment filter for standard 10 x 2.5 RO units. Easy to install and compatible with common filter models; delivers clear water by reducing sediment. Customers note good quality and value for money
- 5-micron filtration
- easy installation
- wide compatibility