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Glossary

Downstream Injector

Definition

A downstream injector is a venturi fitting placed after the pump that siphons cleaning chemical into the water stream, letting you apply diluted soap at low pressure.

The injector uses the flow of water to create suction on a chemical line, pulling concentrate in and mixing it downstream of the pump. Because the chemical bypasses the pump, harsh products like sodium hypochlorite never touch the pump seals.

Each injector has a draw ratio, and the actual dilution depends on that ratio plus hose length and nozzle size. Switching to a high-pressure tip stops the draw entirely, which is how operators toggle between rinsing and applying without changing equipment.

Part of the WashRoute Pro pressure washing glossary - 43 terms and counting.

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