Addotherm trademark k ff flushing fluid is an aromatic mineral oil, Which is relatively user-and acts as an, Friendly and reliable, Low cost excellent tar solvent it represents comparable in solvency to a flammable solvent such as toluene, Without the security and toxicity issues. Addotherm tm k ff also breaks loose baked on by wetting, Carbon deposits the metal better and getting under the hard solids. Use for flushing is very simple drainside the network, Preferably while and refill, Still warm with enough addotherm tm k ff to circulate to all parts of the system usually 70 to 100% of fill volume . Heat system to just below the flash point of 280f 140c, And circulate for 8, 12 hours. The fluid should turn black, And get more viscous. Any addotherm tm k ff remaining in the system after draining is designed to function alongside temperature and should, Control mediums vent from the system expansion tank when coming up to normal operating temperature.