InterFlo IF-14 Drinking Water Filter
Single-cartridge under-sink filter for great-tasting cold water.
A simple, high-performance carbon block filter that installs under the sink and feeds a dedicated cold-water faucet. Not an RO — no membrane, no drain line, no storage tank. Just clean, better-tasting water from a single cartridge you change once a year.
City-water homes that want better taste and cleaner drinking water without the space, cost, or wastewater of an RO system.
What you get
- Reduces chlorine, cysts, giardia, live cryptosporidium, lead, and particulates
- Single-cartridge design — no tank, no drain line
- 12-month cartridge replacement interval
- For cold water use only
- Tested and certified by IAPMO R&T to NSF/ANSI 42 and 53
Specs at a glance
- Type
- Single carbon block cartridge
- Cartridge life
- 12 months
- Certifications
- NSF/ANSI 42 & 53 (IAPMO R&T)
“The easiest, cheapest way to fix chlorinated-tap-water taste for renters or anyone who doesn't want to drill for an RO.”
— The Sawtooth team
Other Drinking Water we carry
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Premium 4-stage RO with the longest membrane life we sell.
DetailsInterFlo · PremiumInterFlo QuadPro SST
Tankless, high-efficiency RO with 4-year membrane life.
DetailsNelsen · ValueNelsen Aqua Classic Reverse Osmosis
Proven under-sink RO with a pressurized storage tank.
DetailsInterFlo IF-14 Drinking Water Filter — common questions
What buyers ask us before they choose this system.
How does reverse osmosis work?
Water is pushed through a semipermeable membrane that blocks dissolved solids, nitrates, lead, and most contaminants while letting water molecules through. Pre-filters catch sediment and chlorine before the membrane, and a carbon post-filter polishes taste on the way to the faucet. Filtered water is held in a small tank under the sink so it's there when you need it.
How often do RO filters need changing?
Pre-filters and carbon post-filters are annual on most systems. The membrane itself lasts three to five years, longer if the water is softened first — hardness is the main thing that shortens membrane life, which is why we usually recommend the softener and RO together.
Does reverse osmosis remove nitrates from well water?
Yes, and that's a real consideration in agricultural parts of the Magic Valley where nitrate levels in private wells can exceed the 10 mg/L drinking water standard. RO is one of the few point-of-use technologies that reliably reduces nitrates. If you're on a well and haven't tested for it, we'll include it in your free water test.
Can RO be plumbed to the refrigerator ice maker?
Yes — that's one of the most requested add-ons. We run a dedicated line from the RO tank to the fridge so ice and chilled water come from the same filtered supply. It's a straightforward addition during install and can be retrofitted later.