We have a job on the roof of a building that we are going to run 135 meters of hose from the compressor to the pot. 1 1/2 inch lay flat through a receiver. Then 20 meters of blast hose. So my question is how much pressure am I going to loose over a run that long? Got a 260 compressor on it. Only got 2 cast iron gutters to do so not bothered if it drops a bit.