Water softeners · valve repair
Cleaning a Clack WS1 injector and screen
If your softener’s brine tank never seems to drop after a regeneration and hard water creeps back, the softener may not be drawing brine. On a Clack WS1 control valve, the first place to look is the injector and the small screen above it — both sit under a hand-tightened cap on top of the valve and can clog with sediment, iron, or salt debris. Here is a triage order for low brine draw, how to clean the injector and screen, and when to stop and call a water-treatment pro.
Is it really a brine-draw problem?
| What you see | Likely cause | Check first |
|---|---|---|
| Brine tank water level does not drop during the brine/slow-rinse step | Injector or screen clogged; air leak in the brine line | Watch the tank during a manual regeneration |
| Salt level barely moves for weeks, water turns hard | No brine drawn, or a salt bridge | Push a broom handle down through the salt — see salt bridges and mushing |
| Brine tank keeps filling higher each cycle | Brine is not drawn out but refill still adds water | Brine tank standing water and brine float |
| Weak or no flow to drain during regeneration | Drain line kinked, frozen, too high, or a plugged drain flow control | Drain hose routing — see softener drain and air gap |
| Draw is weak only on low-pressure days | Inlet pressure too low for the injector to pull brine | House pressure gauge during regeneration |
How the WS1 injector works
During the brine step, water is forced through a narrow nozzle and throat inside the injector. That fast stream creates suction that pulls brine up the brine line from the salt tank and mixes it into the resin bed. Because the passages are small, a little sediment, iron, or scale can stop the suction even when everything else is fine. A removable screen under the injector cap is there to catch debris first.
- Two holes, one injector. Under the cap are two holes marked DN and UP. On a typical downflow softener the injector sits in one hole and a plug in the other. Note which hole the injector came from and put it back the same way.
- Color-coded sizes. Clack injectors are color coded and matched to the tank diameter and media. Do not swap to a different color unless a water-treatment pro or the maker’s chart says so; the wrong injector changes brine draw and rinse rates.
- Small o-rings. The injector and plug each carry small o-rings. Inspect them and replace any that are cut or flattened.
Cleaning steps
- Put the softener in bypass and, if the manual calls for it, unplug the controller.
- Relieve pressure per the Clack manual — for example by stepping the valve into a regeneration position briefly or opening a softened tap downstream of the bypass.
- Unscrew the injector cap by hand. It is designed to be hand tightened; do not use a wrench.
- Remove the screen and rinse it under running water with a soft brush. Look for sand, iron, or salt grit.
- Pull the injector gently (a small flat screwdriver can lift it). Note which hole it was in.
- Clean the nozzle and throat by soaking and rinsing. For scale, a mild descaler such as white vinegar works; for iron, use a resin/iron cleaner listed for softeners. Rinse thoroughly and blow the passages clear with low-pressure air.
- Never ream the orifices with wire, a paper clip, or a drill bit. Scratching or enlarging the opening ruins the injector’s calibrated draw.
- Reinstall the injector in the same hole, lightly lubricating the o-rings with food-grade silicone. Replace the screen and hand-tighten the cap.
- Return to service slowly, check for leaks, then run a manual regeneration and confirm the brine tank level drops during the brine step.
The Clack manual advises against taking the WS1 spacer stack apart. If cleaning the injector does not fix draw, stop there and get service help rather than disassembling the valve body.
If draw still does not recover
- Air leaks: check brine line fittings at the valve and the brine well for cracks or loose nuts; an air leak kills suction.
- Drain restriction: a drain hose that is kinked, run too high, too long, or frozen can stop draw. Confirm the drain line flow control is the correct one for the tank.
- Inlet pressure: injectors need adequate house pressure during regeneration; on a well, check the gauge — see well pressure gauges.
- Brine valve and float: a stuck air check or safety float can block the line.
- Replace the injector if it is cracked, scored, or will not clean up — buy the same color for your valve and tank.
When to call a pro
- Draw does not recover after cleaning the screen and injector.
- You see leaks from the valve body, or the valve needs a piston or spacer stack replaced.
- Iron or sediment keeps plugging the injector — a water-treatment pro can test the water and add pretreatment.
For brine-draw problems that persist, start with a licensed water-treatment pro or licensed plumber. R.E. Merrill & Associates has handled industrial and municipal pumps and fluid systems since 1987 — contact R.E. Merrill & Associates with general water-treatment and system questions.
Related across the site
- Fleck vs Clack control valves — wear items on each valve family
- Low water pressure on a well — low inlet pressure also weakens brine draw
- Leak sensors for the basement, softener, and well tank — catch a valve or brine tank leak early
Sources
- Clack Corporation WS1 and WS1.25 Drawings and Service Manual — injector cap, screen, DN/UP holes, color-coded injectors by tank diameter, cleaning guidance.
- General water-treatment service practice for brine-draw troubleshooting on residential softeners.