Wentzville homes with a water softener rely on a small part called the injector to pull salt brine from the brine tank into the resin tank during each recharge. When the injector or its screen is restricted, the softener can run its cycle on schedule and still leave hard water at the tap. This guide explains how to check the brine draw step by step before you decide the unit needs service.
What the injector does
During regeneration, water flowing through the injector creates suction. That suction draws brine from the brine tank into the resin, where the salt recharges the resin beads so they can capture hardness again. Most units have a screen at the injector inlet to catch sediment from the supply line. If the screen clogs, or the injector nozzle picks up debris, brine draw slows down or stops, and the resin may not get fully recharged.
Signs the brine draw may be weak
- Water at the tap feels harder than usual, even though the control shows a recent regeneration.
- The salt level in the brine tank stays nearly the same from one check to the next.
- During regeneration you hear little or no change in flow sounds, or the cycle seems unusually quiet.
- The water level in the brine tank looks unusually high or unusually low compared with its usual level.
None of these confirms a single cause. Salt bridges, low supply pressure, a stuck control valve, and a timer set to the wrong cycle can produce similar symptoms. Use this list to narrow the check, not to diagnose the unit.
Checks you can do safely
- Confirm the unit is not on bypass. Read the valve handle position, and make sure the softened line is open.
- Look at the salt level and note where the water sits in the brine tank. Write both down with the date.
- Check the control display for the time of the last regeneration.
- Before opening anything, follow the manufacturer's instructions for shutting off water and power to the unit. Wear gloves and keep your hands out of the brine.
- If your injector screen is accessible, remove it carefully, rinse it in clean water, and check that the nozzle opening is clear. Reinstall it in the same orientation.
- Run a manual regeneration once everything is reassembled, then check the brine tank level and how the tap water feels.
When to stop and call for help
If the injector screen is hard to reach, if parts look cracked or worn, or if the unit still produces hard water after a manual regeneration, stop and have a qualified service person look at it. A water supply that carries iron or sediment can clog the injector again within a short time, so ask whether a pre-filter is in place ahead of the softener. Public water reports describe the tap water in Wentzville as very hard, so a softener is often the main treatment for household fixtures. A stalled brine draw is worth fixing soon rather than waiting for the next scheduled check.
Keeping a simple record
Write down the date, the salt level, the water level in the brine tank, and any change you notice at the tap. Over several weeks you can see whether the brine tank is refilling correctly and whether salt use matches what you expect for your household. Keep these notes with the unit's manual so the next person working on it has the same information.