Key Features

• Replacement Filters: To replace filters for your Ontulor S3OP under-sink reverse osmosis water filtration system, search B0G1LKXZBX for C2 filter, B0G1LF3BHK for PC filter, B0G1L8DN9N for RO filter
• Certified Safe & Reliable: Ontulor reverse osmosis system is tested and certified to NSF/ANSI 42 & 372 standards, giving you confidence in every sip. It reduces chlorine, odors, and bad taste while ensuring all materials are lead-free (≤0.25%). Independently verified by third-party labs, this RO water filter system meets U.S. drinking water standards—so you know your family is drinking clean, safe water every day
• 9-Stage Deep Filtration for Healthier Water: This reverse osmosis water filter goes beyond the basics with a 9-stage RO membrane that removes the vast majority of harmful contaminants down to 0.0001 microns. It reduces TDS, PFOA/PFOS, heavy metals like lead and mercury, as well as fluoride, nitrates, microplastics, and more. The RO system even helps lower water hardness by filtering calcium and magnesium—protecting both your health and your home’s plumbing
• Space-Saving Enclosed Design：Unlike bulky canister units, this RO Water Filtration System comes in a sleek, fully enclosed body that keeps filters hidden inside. No messy tubes or exposed housings—just a clean, modern setup that fits neatly under your sink (14.22"L x 4.7"W x 12.54"H). The compact design makes your kitchen look organized while still delivering powerful water purification
• Easy Setup & Hassle-Free Filter Changes: The RO water filter system is designed for convenience from day one. Installation takes as little as 20 minutes with step-by-step instructions. A built-in LED monitor tells you exactly when a filter needs changing—no guesswork. When it’s time, just open the side panel and replace the cartridge in seconds, with no tools required (Standard power outlet needed)
• Fast Flow & Fresh Taste from the First Cup: Enjoy crisp, refreshing water with no wait time. Thanks to its pressurized storage tank, this RO system delivers up to 0.53 gallons per minute—enough to fill a glass in just 8 seconds. The post-activated carbon filter improves taste, giving you water that’s clean and smooth. Unlike many other reverse osmosis water filters, you get low TDS water from the very first pour—no flushing required
• Durable & Leak-Free Construction: Built with a fully sealed structure and reinforced housing, this RO system offers long-lasting durability and reliable leak protection. High-strength materials withstand daily use and pressure fluctuations, helping to prevent cracks, leaks, or failures. Designed for low maintenance, the RO water filter system ensures dependable performance and peace of mind with every use

Specifications