When the vacuum on the chlorinator system is too low, where should you look for the problem?

• A. The chlorine cylinder valve
• B. The injector
• C. The reservoir level
• D. The air vent

Answer: (B)

The suction that draws chlorine solution into the system is produced by the injector (Venturi) as water flows through it. If the vacuum is too low, the injector isn’t creating enough suction to pull the chemical from the reservoir.

This usually means something is wrong with the injector itself: the nozzle or passage can be clogged or worn, the injector may be misaligned, or there could be leaks around the injector or upstream in the piping that reduce the flow and, in turn, the suction. It could also be a flow/pressure issue downstream that isn’t providing enough velocity to sustain the Venturi effect.

To fix it, inspect and clean the injector, check for any obstructions in the line, ensure the flow rate and pressure are within the design range, and replace the injector if worn or damaged. Make sure there are no air leaks around the injector and that the reservoir is properly vented so air isn’t being sucked into the system.

The chlorine cylinder valve controls the chemical supply, not the suction created by the injector. The reservoir level affects how much chemical is available to inject, not how much suction the injector can generate. The air vent’s job is to vent air from the system, but the primary cause of low vacuum is an injector issue.