Irregular water jet from outlet hose

Checklist:

1. Make sure that the water is not mixed with water.
2. Make sure you are using the correct chemical.
3. Check if the injector is clogged by chemical residues.
4. Check if the air supply is switched on.
5. Check that the air supply is not too high for the injector.
6. Check the outlet hose for damages.
7. Check the foam nozzle for damages. Look inside to make sure the pre-foam pin is in place.
8. Check the edges of the brass/SS nozzle. Replace the foam nozzle if necessary.