Water softener not working? Why your water is still hard

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First, confirm the water is actually hard

Before taking anything apart, get a number. Use a hardness test strip or drop kit on cold water (see how to test hardness at home). Morton's troubleshooting guide says to check with a test strip at several cold faucets after a recharge, rather than trusting one tap.

• Test cold, not hot. GE Appliances notes that after the softener starts working again, it takes a day or so for soft water to flush through the water heater. Hot water can stay hard for a while even when the softener is fine.
• Know your incoming hardness. If you don't know it, check your utility's water quality report or test a faucet that's plumbed before the softener, such as an outdoor spigot on many homes. The hardness numbers page converts mg/L, ppm and grains per gallon (gpg).

The pattern of the result points to the cause. Hard right after a fresh recharge usually means water is getting around the softener or the recharge isn't working. Soft after a recharge but hard again a few days later usually points to the settings or the unit's capacity.

The quick checks (most fixes are here)

GE's owner's manual lists four common causes to check before calling for service: not enough salt, the bypass valve left in bypass, a hardness setting that's too low, and a salt bridge. Work through them in this order:

1. Bypass valve. Most softeners have a bypass on the control valve so water can skip the unit during repairs. On GE models the knob is marked "push for bypass" and must be in the out (service) position. Some homes also have a three-valve bypass loop in the plumbing; Morton's guide says to check those valve positions too. In a typical three-valve loop, the inlet and outlet valves are open and the middle bypass valve is closed, but follow the diagram for your unit.
2. Power and clock. GE says the display should show the time of day and not be flashing, and the outlet shouldn't be on a wall switch. A.O. Smith's manual lists an extended power outage as a cause of hard water: reset the time of day and start a regeneration.
3. Salt level. GE says to keep the salt at least 1/4 full (it recommends 3/4), and its manual says at least 1/3. Morton says to keep salt between the 2 and 5 marks on its brinewell scale. If the tank ran empty, refill it and start a manual recharge.
4. Salt bridge. A hard crust can form above the water so the salt never dissolves into brine. GE's test: push a broom handle down into the salt; if it hits something hard that isn't the bottom or sides, you have a bridge. Break it carefully without damaging the tank walls. Our softener salt guide covers prevention.
5. Hardness setting. If the setting is lower than your actual hardness, the softener runs out of capacity before it regenerates. GE says to verify the incoming hardness and adjust the setting. A.O. Smith also lists "water hardness has increased" as a cause: retest and enter the new number.

After any fix, start a manual recharge, wait for it to finish, then retest cold water.

If the salt level never goes down

A softener that isn't using salt isn't regenerating its resin. Morton's guide lists three causes for "no soft water and the salt level is not dropping": a salt bridge, the bypass in the bypass position, and a hardness setting that's too low. GE's manual adds a plugged nozzle and venturi (the small injector that sucks brine out of the salt tank) and notes that efficient demand-type units simply don't use much salt.

Morton's step-by-step guide also asks whether the unit is counting water: on metered models, start a faucet and watch whether the display's usage counter climbs. If it doesn't count, Morton says to check the bypass first. A.O. Smith's manual adds that a unit plumbed backwards won't meter, and that a jammed turbine or a bad sensor can be the cause. GE says hard water enters on the right side of its units and soft water leaves on the left, so a backwards install is worth checking on a new setup.

If the recharge isn't drawing brine

GE's manual describes a way to watch a recharge: start a manual recharge, look into the brinewell with a flashlight to see water entering during the fill step, then during the brining step check that the liquid level drops noticeably over about 20 minutes. If it doesn't draw brine, the usual suspects are:

• A dirty or damaged nozzle and venturi. GE and Morton both say to take it apart, clean it and inspect it, with the water pressure to the softener off. A.O. Smith says to clean the injector's nozzle and throat with a wooden toothpick.
• A restricted drain hose. GE says a pinched, plugged or too-high drain hose can reduce or stop brine draw, and that with low water pressure even an elevated hose can do it. A.O. Smith adds a frozen drain line.
• A plugged brine line or sediment in the salt tank. A.O. Smith says to flush the brine line and air check, and clean sediment out of the brine tank.

Morton also says that standing water above the salt means the unit isn't recharging the resin properly. Follow your manual's steps for excess water in the brine tank.

Iron and well water

Dissolved iron uses up resin capacity just like calcium and magnesium. The Water Quality Association explains that softener sizing uses a "compensated hardness" that adds a factor (typically 3, but sometimes 2, 4 or 5) for each ppm of iron to the hardness in gpg, so the softener regenerates sooner. Check what your manufacturer specifies.

Iron can also foul the resin. WQA says oxidized iron fouls resin and leaks through, and that resin companies recommend limiting iron treated by a softener to less than 3 ppm. The University of Minnesota Water Resources Center says softeners may remove up to 3 mg/L of iron and suggests an iron filter above that. If you're on a well and the softener keeps losing ground, an iron and manganese test belongs on your list.

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When it's a repair, not a setting

If the bypass, salt, power, settings and brine draw all check out and the water is still hard right after a recharge, the problem is likely inside the valve or tank. Morton's guide lists a leaking inner valve (replace the seals and rotor), a dirty brine valve float, and a leak between the valve and the resin tank (replace the O-rings). Its step-by-step guide ends with a rinse-water test to check the distributor O-rings. These repairs vary by model, so use your owner's manual or the manufacturer's service line. If the unit is old and needs major parts, compare repair against replacement using softener sizing and softener vs conditioner.

Last updated: 2026-10-29