The FDN2 has all the same capabilities as the FAM1 filter, plus it can remove higher levels of nitrates. It uses a two-stage system to effectively purify your water. The first stage is a textile-based system which removes physical impurities including dirt, sand, rust, and metal pieces from pipes. The second stage uses bacteriostatically treated granular activated carbon to remove dissolved substances including chlorine, radon, heavy metals, organic substances, detergents, and pesticides. It also improves the taste, clarity, and color of water.
The FDN2 filter is suitable for water with nitrate levels over 50mg/L. For lower nitrate levels, use the Dionela FAM1 filter. If you also want to reduce water hardness, use the Dionela FTK3.