I'm doing a house tomorrow but I'm going to be using my new chemical injector until my softwash rig is ready. 

Now my house washed is for 3 onces per gallon of water and 8 once said of SH.

If I mix the wash and the SH together in a 5 gallon bucket, how much water will i have to add to the bucket? Because I know that the pressure washer will be adding water also. 

Any help on this would help cause I don't know what the % of chemicals with be sucked out of the injector.