It’s better to take used or old coolant to a local recycling service. Before it, the user has to keep the spoiled liquid separately and far away from other coolants. Such a matter can contain heavy metals and can be regarded as a hazardous waste. If you can’t drive the substance to the required service, you can hire the special hauler. Sometimes, specific locations are supplemented with special recycling units, which are able to remove glycol and transform it into the reusable agent. Pay attention that this process can be performed only in a case of the oils and other contaminant absence into the coolant.