Including filter system and high-performance 4:2 FTS filter.
4:2 FTS is one member of the PFAS family that can travel through the environment and show up in drinking water. Madison homeowners often first hear about it from a utility notice, a private well test, or during a real estate inspection. You won’t be able to see or taste 4:2 FTS, yet many families in Madison prefer to limit exposure and feel confident about water used for drinking, cooking, and bathing. Tackling it starts with choosing treatment aimed at PFAS reduction rather than only sediment or basic taste filters.
Because 4:2 FTS belongs to the broader group of fluorinated compounds, it’s commonly discussed alongside other PFAS even when only that compound appears on a report. Typical carbon taste filters, water softeners, and sediment cartridges aren’t guaranteed to remove PFAS consistently. For Madison homes, the most dependable plan is whole-house treatment at the main water line so every faucet and appliance is covered—avoiding the need to rely solely on a single under-sink filter for peace of mind.
To reduce 4:2 FTS throughout a house, the top whole-house option is a high-capacity granular activated carbon (GAC) system sized and specified for PFAS removal. Activated carbon can adsorb many PFAS compounds, but how well it works depends on having enough carbon and sufficient contact time as water flows through the tank. That’s why full-size tank-based or backwashing GAC units are often preferable to small inline cartridges when a Madison homeowner wants meaningful, home-wide reduction. Correct sizing also helps the carbon last longer and perform more reliably between services.
A whole-house GAC system is mounted on the main water line so showers, sinks, laundry, and kitchen water all receive treatment. These systems are normally paired with a sediment prefilter to protect the carbon bed from clogging and channeling. For PFAS compounds like 4:2 FTS, regular maintenance matters as much as installation—exhausted carbon won’t continue to adsorb effectively. Mr. Pure Water in Madison can evaluate your home’s flow and water conditions and recommend the right carbon system to deliver consistent, house-wide treatment.