iSpring US31KF-PF True Physical 3-stage PFAS Removal Under-Sink Water Filter System Reduces PFOA/PFOS, Rust, Sand, Odor, 10,000 Gallons Capacity, NSF/ANSI Compliant, Direct Connect to Kitchen Faucet, 10-Year Reusable Housings.

About this item

• Do It Right Once, Then Enjoy It with Ease – Installation and filter replacement take a bit more time and effort than twist‑on disposable 1-stage, but a worthy trade‑off for longer filter life, better filtration, and lower long‑term cost. Search YouTube for "How to Install iSpring US31KF Under Sink Water Filtration System" before purchasing. You'll find you can do it.
• Proven 3-Stage System, Built for PFAS Reduction – The classic 3-stage 2.5" x 10" system—trusted for decades—now upgraded with PFAS-focused filtration media to effectively reduce up to 99% of PFAS (“forever chemicals”), along with chlorine, VOCs, and other contaminants for cleaner, better-tasting water.
• You Pay for Filter, Not Disposable Plastic – The second‑stage carbon block filter delivers ~13 oz of activated carbon in a reusable housing built to last 5–10 years. That's 2.3× more carbon than quick‑change twist‑on cartridges, with only ~1 oz of plastic. Those disposable cartridges pack just 5 oz of carbon inside a 12‑oz plastic shell – then get thrown away after one use. Every quick‑change cartridge you buy funds plastic waste, not clean water.
• What You See Is What's Caught – The transparent housing lets you see your filter color change and mud buildup in real time, so you know your money is at work — not on guess.
• Lifetime Local Support – Enjoy a 30-day money-back guarantee, a 1-year limited warranty, and lifetime technical support from our Atlanta, GA team – real people, real help, right here in the U.S.
• Don't want to drill or modify your kitchen? Traditional under sink filters require permanent countertop changes — US31KF-PF connects directly to your existing cold water supply with standard 3/8″ compression fittings. No drilling. No extra faucet. No plumber.
• Healthy Minerals Retained (Does Not Lower TDS): Unlike RO systems, our PFAS removal under sink water filter reduces harmful contaminants while keeping beneficial minerals.