FIELD TECH GUIDE • SEP 2026 SYSTEM TROUBLESHOOTING DON'T SWAP THE INJECTOR JUST YET. When chemical stops pulling in the middle of a job, swapping your injector is sometimes an unnecessary expense. Downstream injection requires a balanced system approach where pressure differential, hoses, gun and nozzle function as a single unit. THE SYSTEM APPROACH A downstream injector relies on the Venturi effect: water velocity creates low pressure to draw chemical. If backpressure increa