Downstream soft washing is a form of soft washing that utilizes a high- pressure pump that forces a mixture of water and cleaning solution through the pressure washer’s nozzle. The injector works by using the venturi effect to draw soap into the water stream. The down stream injector is installed after the high pressure pump (down stream from the pump). A large orifice tip/nozzle is used to apply chemicals to the surface around 100-300 PSI. Down streaming is the most common method used to apply chemicals to most surfaces at a low, safe pressure. The only downside to down streaming is that the soap draw ratio is limited to around 10-20% depending on the injector type, injector size, pressure washing machine GPM / PSI, hose length / ID, and tip size. So for surfaces that need a stronger cleaning solution such as roofs and heavily soiled concrete, a dedicated soft washing pump or a pump sprayer will be needed.

Situations Where A Down Stream Injector Could Be Used:

Hopefully this short article has helped you better understand the down stream soft washing method and the attachments needed to down stream using your pressure washing machine. If you have questions or need help selecting the right attachments for your specific needs, we are here to help!