External filtering units are usually the only effective option for keeping hydraulic fluids at a definite level of purity. In the offline circuit, a circulating pump is combined with an appropriate sized filter, and the oil is circulated under constant conditions, independently of the flow rate in the general system. These offline filters also work when no oil is pumped in the main system. In our product group, we also have small compact standard units, besides the subsystems arranged according to customer specifications. Using clean of hydraulic oil extends the life of the pumps, cylinders and valves, while reducing maintenance and spare parts costs.