iSpring 3-Stage Under Sink Tankless Water Filtration System, SGS-Tested PFAS Reduction, NSF/ANSI Standards, Long-Lasting Durability, w/ Up to 1-Year Replacement Filter Set (Model: US31-PF)
$209.99
About this item
- SGS-Tested PFAS Reduction – Engineered to target and reduce PFAS for safe, clean drinking water you can trust.
- Triple-Stage Filtration – Starts with PP sediment to capture large particles; the mid-stage CTO polishes water quality; and the final CTO effectively reduces PFAS, rust, dirt, taste, and odors for crisp, refreshing water.
- Fast Everyday Flow – Delivers up to 1 GPM, ideal for cooking, drinking, and daily use without slowing you down.
- Quality & Easy Care – Tankless design with brushed-nickel faucet and clear first-stage housing; tested to meet NSF/ANSI 42/53/61. Simple maintenance keeps performance steady.
- F3-PF Replacement Filters Included – Purpose-built for US31-PF, a convenient set that supports up to 1 year of fresh, great-tasting water (replacement interval depends on use and water quality).
Frequently Bought Together

iSpring US31-PFF3 3-Stage Under Sink Tankless Water Filtration System, SGS-Tested PFAS Reduction, NSF/ANSI Standards, Long-Lasting Durability, w/ Up to 1-Year Replacement Filter Set (Model: US31-PF)
$209.99
- Availability: In Stock
- Model: US31-PFF3
- Manufacturer: iSpring
- Product Dimensions: 14.00"L x 5.25"W x 14.00"H
- Product Weight: 13.00 LB
-
iSpring ORF O-Ring for 10 inch Water Filter Housing Oring
$6.99 -
iSpring FC15 NSF/ANSI 58 Certified Standard 10 inch CTO Carbon Block Water Filter Cartridge Replacement, 5 Microns
$22.99 -
iSpring FP15 NSF/ANSI 58 Certified 5 Micron 10"x2.5" Standard Sediment Water Filter Filter Cartridges
$18.99 -
iSpring AWR2 2-in-1 Reverse Osmosis Pre-Filter Housing and RO Membrane Canister Wrench
$18.99 -
iSpring HC12 1/4'' Water Filter Housing 10 inches, Clear
$27.99 -
iSpring HW12 10 inches Reverse Osmosis Water Filter Housing - White, 1/4 Inch
$28.99 -
iSpring T14W Reverse Osmosis RO Water Filter DI Aquarium 1/4" Tubing, White, 50 ft
$23.99 -
iSpring T14B Reverse Osmosis RO Water Filter DI Aquarium 1/4" Polyethylene Tubing, 50 ft, Blue
$23.99 -
iSpring ICEK Ultra Safe Fridge Water Line Connection and Ice Maker Installation Kit for Reverse Osmosis RO Systems & Water Filters, 1/4", Approximate 20 feet
$21.99 -
iSpring AFW43 Feed water adapter, Sliver
$19.99 -
iSpring GA1-BN Heavy Duty Non-Air Gap Drinking Faucet for Water Filtration, Reverse Osmosis Systems-Brushed Nickel-Contemporary Style High-Spout
$45.99 -
iSpring AIG1 Easy-Install Top Mount Reverse Osmosis RO Drinking Water Faucet Installation Accessory Kit, US Patent Pending
$11.99 -
iSpring ASKRCC Slide-Out Mounting Kit for Under Sink Reverse Osmosis Water Filter System, Fits RCC Series
$80.99 -
iSpring FC15-PF SGS Tested Replacement Activated Carbon Fiber Water Filter Cartridge for US31-PF Under Sink Water Filtration System and CW31-PF RV Water Filter System, Removes PFAS, Up to 12 Months
$41.99 -
iSpring F3-PF Water Filter Replacement Pack for US31-PF and CW31-PF
$48.99
-
Start Download
US31 Manual