Clean Your Rheem Water Softener Every Six to Twelve Months

A Rheem water softener needs cleaning inside the resin tank and brine tank to work properly. Mineral buildup and sediment reduce how well the softener removes hardness from your water, and a dirty brine tank can introduce salt residue into your system. Most Rheem owners can do basic cleaning without a technician — it takes about an hour and costs almost nothing beyond what you already have at home.

The exact steps depend on whether your Rheem model is a single-tank or dual-tank system, but the principle is the same: you flush the resin tank with a cleaning solution, then rinse it thoroughly. If your water is very hard or you have high iron content, you may need to clean more often than the standard yearly schedule.

Key Takeaways

  • Rheem water softeners should be cleaned inside the resin tank once or twice a year, or more often if your water has high iron content.
  • You will need a resin cleaner (Rheem makes one, or you can use a commercial alternative), a wet vacuum, and access to your softener's service valve.
  • The cleaning process involves backwashing, adding cleaner to the resin, soaking for several hours, then rinsing until the water runs clear.
  • The brine tank should be emptied and wiped down at the same time, and you should check the salt level and condition during every cleaning cycle.

What You Need Before You Start

Gather a resin cleaner before you begin. Rheem sells its own resin cleaner, which is formulated for their systems and available through their parts website or through appliance retailers. If you cannot find Rheem brand, a general-purpose water softener resin cleaner from another manufacturer will work — look for one labeled for ion-exchange resin tanks. Do not use vinegar or bleach, which can damage the resin beads.

You will also need a wet vacuum or a bucket and siphon to remove water from the tank, a wrench to open the service valve, and a way to bypass your softener during cleaning (either a bypass valve on the unit itself or by closing the inlet and outlet valves). Have towels ready — this process creates water spillage. If your Rheem model has a control head you can remove, check your manual for whether it needs to come off before you start; most newer Rheem units do not require removal.

Backwash and Prepare the Resin Tank

Turn off the softener at the control panel or unplug it. Close the inlet and outlet water valves on the unit, or engage the bypass valve if your system has one. This stops water from flowing through the softener while you work.

Open the service valve (usually located at the bottom of the resin tank) and drain the tank completely using a wet vacuum or by opening a drain line into a bucket. Once the tank is empty, close the service valve. Some Rheem models have a separate backwash valve — if yours does, set it to backwash mode before draining. Check your owner's manual if you are unsure which valve is which; the manual diagram will show the exact location and function of each valve on your specific model.

Add Cleaner and Let It Soak

Pour the resin cleaner into the top of the resin tank according to the product instructions — most cleaners call for one to two quarts per tank. Add warm (not hot) water to the tank until it is about one-third full, then stir gently to mix the cleaner with the resin beads. The goal is to coat all the resin without creating a slurry that is too thin.

Let the mixture soak for at least four to eight hours, or overnight if possible. During this time, the cleaner breaks down mineral deposits and iron buildup on the resin surface. Do not run water through the softener during the soak — keep the inlet and outlet valves closed. If your Rheem model has a timer, you can leave it in standby mode, but do not initiate a regeneration cycle while the cleaner is soaking.

Rinse the Resin Thoroughly

After the soak, open the inlet valve slowly to allow fresh water to flow into the tank. Let water run through the resin for several minutes, watching the water that drains from the service valve. At first, the water will be cloudy or discolored from the cleaner and loosened deposits. Keep the water running until it runs clear — this usually takes ten to fifteen minutes, but can take longer if buildup was heavy.

Once the rinse water is clear, close the inlet valve and the service valve. Open the outlet valve to check that water flows normally through the system. If water pressure seems low or the flow is weak, you may need to run another short rinse cycle. Turn the softener back on at the control panel and run a manual regeneration cycle to reset the system to normal operation.

Clean and Inspect the Brine Tank

While the resin tank is soaking, empty the brine tank completely. Most Rheem brine tanks have a drain plug at the bottom — open it and let the salt water drain into a bucket or down a floor drain. Once empty, wipe the inside of the tank with a damp cloth to remove salt residue and any sediment that has settled on the bottom. Pay special attention to the corners and the area around the float mechanism, where salt bridges (hard salt crusts) often form.

Check the float ball or float assembly inside the brine tank — it should move freely up and down. If it is stuck or encrusted with salt, clean it gently with a soft brush and fresh water. Refill the brine tank with fresh salt according to your Rheem manual's instructions. Most systems use either rock salt or solar salt; check which type your manual recommends, as some Rheem models are sensitive to the salt form you use.

When to Call a Technician Instead

If your water pressure does not return to normal after cleaning, or if the softener does not seem to be softening water after a cleaning cycle, the resin may be damaged or the control head may need service. A Rheem technician can test the resin and replace it if necessary — resin typically lasts ten to fifteen years, but can fail sooner in very hard water areas.

If you see salt bridges (hard crusts) forming in the brine tank every month or more often, or if you smell rotten eggs or sulfur odors from the tank, these are signs of bacterial growth or iron bacteria that cleaning alone will not fix. A technician can treat the tank with a biocide or recommend a pre-filter to remove iron before it reaches the softener. Do not attempt to use bleach or other harsh chemicals in the brine tank without professional guidance, as they can damage the system.

Frequently Asked Questions

How often should I clean my Rheem water softener?

Once or twice a year is standard for most water conditions. If your water has high iron content (more than 2 to 3 parts per million), clean every three to four months. If you notice the softener is not removing hardness as well as it used to, or if water pressure drops, clean sooner rather than waiting for the scheduled time.

Can I use vinegar to clean the resin tank?

No. Vinegar can damage ion-exchange resin beads and void your Rheem warranty. Use only a resin cleaner made for water softeners. Rheem brand cleaner is the safest choice for their systems, but other commercial resin cleaners designed for ion-exchange tanks will work.

What does it mean if the water is still cloudy after rinsing?

Cloudiness usually means small resin particles are being flushed out, which is normal and harmless — it will clear on its own within a few hours. If cloudiness persists for more than a day, or if the water smells bad, stop using the softener and contact a Rheem technician, as the resin may be breaking down.

Do I need to turn off the water to my whole house while cleaning?

No. Close the inlet and outlet valves on the softener itself, or engage the bypass valve. This isolates the softener from your home's water supply while you work. Your house will have hard water during the cleaning, but water will still flow normally to all your taps.

What is a salt bridge and how do I prevent it?

A salt bridge is a hard crust that forms inside the brine tank, usually from humidity or temperature changes. It traps salt above the water level, so the softener cannot dissolve it. Prevent bridges by keeping the brine tank covered, avoiding overfilling with salt, and stirring the salt occasionally with a broom handle. If a bridge forms, break it up gently with a long stick or call a technician.