Glysofor N optimally prevents frost damage, corrosion, deposits, sludge accumulation, and bio-films. Glysofor N is completely free of nitrites, amines, phosphates, silicates, and borates. It is biodegradable and environmentally friendly. Both as a concentrate and diluted, Glysofor N is classed in the lowest water pollution class, WGK 1. Water pollution class 2 or 3 substances are not included in Glysofor N. Glysofor N exhibits long-term resistance to the formation of bio-films, rot, and resistance to microbiological decomposition, which avoids deposition and sludge accumulation. Homogeneous Glysofor N/water mixtures do not separate, which ensures continuous frost resistance. This guarantees year-round, long-term, low-maintenance operation of systems filled with Glysofor N.