It is true that the smallest max capacity filters are 1000 l/min. But it doesn’t matter if the flow is 300, 500 or 700 l/m, the only regulation is the max capacity of 1000 l/min. Depending on the applications, it important to have filters both on a piston and on screw compressors as you will be able to: - Remove dirt particles from compressed air that could damage the final tools/equipment - Remove the presence of oil in the compressed air that could damage the final product