Service life, production quality, industrial hygiene, disposal: high demands are placed on cooling lubricants and other liquids. Foreign oils and suspended contaminants can stop the oxygen supply causing the medium to become unstable and having to be replaced. Otherwise, bacteria, fungi and yeasts can develop that often cause skin irritation, allergies and mucus formation. For this reason, cleaning with KÜMA oil skimmers is essential, for hygienic as well as economic reasons.