When grinding tools, ultrafine coolant filtration is clearly a worthwhile proposition for the tool manufacturer or regrinder: The cleaner the grinding oil is and the less often it has to be replaced, the more it will save on coolant costs, minimize waste, and reduce tool costs and machine downtimes. Filter technology, which not only cleans the grinding oils and coolants economically, but also keeps them temperature-stabilized state in the system for an extended time period, achieves measurable gains.