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Water Softener 5900 Twin Tank Continuous Duty
4 Items
Continuous Soft Water with a Twin Tank Water Softener
A twin tank water softener provides dependable softened water around the clock—even while the system is regenerating. Unlike a conventional single-tank softener, which may temporarily bypass untreated hard water during regeneration, a twin alternating system always keeps one regenerated resin tank ready for service.
One tank supplies soft water to your home while the second tank remains regenerated and waiting. When the operating tank reaches its programmed capacity, the control valve automatically switches to the standby tank. The exhausted tank then regenerates with softened water and returns to standby for the next cycle.
The result is continuous soft water 24 hours a day without depending on a large reserve setting or waiting until the middle of the night to regenerate.
Why Choose a Clean Water Store Twin Tank Softener?
- Continuous soft water: One tank remains available while the other regenerates.
- Automatic tank switching: The control valve changes tanks automatically based on actual water use.
- Demand-initiated regeneration: The system meters water consumption and regenerates only when needed.
- Regeneration with softened water: The tank remaining in service supplies softened water to the tank being regenerated.
- Bluetooth setup and diagnostics: Review settings, operating information, and advanced diagnostics from a compatible smartphone or tablet.
- Made-in-USA control valve: The Legacy View control valve is manufactured by Chandler Systems in Ashland, Ohio.
- Premium ResinTech® CG10 resin: Genuine 10% crosslinked softening resin provides greater durability and oxidation resistance than standard 8% residential resin.
- Fully adjustable programming: Regeneration cycles and operating capacity can be configured for your water conditions and desired salt efficiency.
- Battery-backup feature: A 9-volt battery helps maintain important metering and valve-position functions during a power interruption.
- Multiple system sizes: Choose the capacity that fits your household, hardness level, water use, plumbing, and required flow rate.
Twin Tank vs. Single-Tank Water Softener
| Feature | Twin Tank Softener | Typical Single-Tank Softener |
|---|---|---|
| Soft water during regeneration | Yes | Usually No |
| Regenerated standby tank | Yes | No |
| Continuous-duty operation | Yes | No |
| Regenerates with softened water | Yes | Usually No |
| Handles unpredictable water use | Excellent | Depends on reserve capacity |
| Number of resin tanks | Two | One |
| Initial equipment cost | Higher | Lower |
Made in the USA by Chandler Systems
The Bluetooth-enabled Legacy View control valve is made in the USA by Chandler Systems, Inc. of Ashland, Ohio. Chandler Systems manufactures the circuit boards and molded valve components in the United States and completes valve assembly and testing at its Ohio facilities.
The Legacy View control combines American manufacturing with modern Bluetooth setup, demand-initiated regeneration, flexible programming, advanced diagnostics, and dependable twin-tank operation.
Premium ResinTech® CG10 10% Crosslinked Resin
The control valve operates the softener, but the resin is the material that actually removes calcium and magnesium hardness from your water. Our twin tank systems include genuine ResinTech CG10 strong-acid cation exchange resin.
Many residential softeners contain standard 8% crosslinked resin or resin that is not clearly identified. ResinTech CG10 uses a premium 10% crosslinked structure for greater physical durability and improved resistance to oxidation and chlorine-related degradation.
- Excellent removal of calcium and magnesium hardness
- Greater physical durability than standard 8% resin
- Improved resistance to chlorine-related degradation
- Reduced risk of premature resin-bead breakdown
- Suitable for demanding residential and well-water applications
- Long service life when properly sized, programmed, and maintained
Who Should Consider a Twin Tank Softener?
A twin alternating water softener is an excellent choice when uninterrupted soft water is important or when household water use is difficult to predict.
- Homes where water is used throughout the day and night
- Families with varying work, school, or bathing schedules
- Homes with multiple bathrooms or simultaneous water use
- Private well-water applications with hard or very hard water
- Vacation rentals, guest homes, and multi-generational households
- Homes where untreated hard-water bypass during regeneration is undesirable
- Selected small-business and light-commercial applications
A properly sized single-tank softener may still be a good and economical choice for smaller households with predictable water demand. The primary advantage of a twin tank system is its ability to deliver softened water continuously without waiting for regeneration to finish.
Benefits of Soft Water Throughout Your Home
- Reduces hardness scale in plumbing pipes and fixtures
- Helps protect conventional and tankless water heaters
- Reduces spotting on dishes, glassware, faucets, and shower doors
- Improves soap and detergent performance
- Reduces soap scum in sinks, showers, and bathtubs
- Helps laundry feel cleaner and softer
- Makes bathrooms and kitchens easier to clean
- Helps protect washing machines, dishwashers, and other water-using appliances
How to Choose the Correct Size
Water softeners should not be selected by grain rating or bathroom count alone. Proper sizing depends on several factors:
- Number of people in the home
- Daily household water consumption
- Tested water hardness in grains per gallon
- Dissolved iron and manganese levels
- Required service flow rate
- Plumbing diameter and incoming water pressure
- Desired salt efficiency and regeneration frequency
Each twin tank system has a nominal grain capacity per tank. Because the tanks operate alternately, one tank normally supplies the home while the second tank remains regenerated and ready. The most efficient programmed operating capacity will generally be lower than the theoretical maximum grain rating.
Frequently Asked Questions
What is a twin tank water softener?
A twin tank water softener uses two separate resin tanks. One tank supplies softened water while the second tank remains regenerated and ready. When the operating tank reaches capacity, the valve automatically switches tanks and regenerates the exhausted tank.
Is a dual tank softener the same as a twin tank softener?
Yes. Twin tank, dual tank, twin alternating, alternating tank, and continuous-duty water softener are common terms for this type of system.
Will I have soft water while the system regenerates?
Yes. The standby tank enters service while the exhausted tank regenerates, allowing the system to continue supplying softened water to the home.
Does a twin tank softener use twice as much salt?
No. Both tanks do not regenerate at the same time. Only the exhausted tank regenerates. Actual salt use depends on water hardness, dissolved iron, household water use, programmed operating capacity, and salt dosage.
Why is softened-water regeneration beneficial?
The tank remaining in service supplies softened water to the tank being regenerated. This provides a more consistent brining and rinsing process and avoids introducing untreated hardness into the regenerating resin bed.
Does Bluetooth mean the softener connects to Wi-Fi?
No. Bluetooth provides local communication with a compatible smartphone or tablet. It does not require the softener to connect directly to your home's Wi-Fi network.
Does the softener need a phone to operate?
No. Once properly programmed, the control valve automatically meters water use, changes tanks, and initiates regeneration. Bluetooth is used as a convenient setup and diagnostic tool.
Can these systems be used on private well water?
Yes. Twin tank softeners are well suited for many private well-water applications. However, iron, manganese, sulfur odor, sediment, low pH, tannins, or bacteria may require additional treatment ahead of the softener.
Can a water softener remove iron?
A water softener may remove limited amounts of clear-water dissolved ferrous iron. Iron uses softening capacity and may foul the resin. Moderate or high iron, oxidized iron, iron bacteria, manganese, or sulfur odor may require dedicated pretreatment.
How often will the system regenerate?
Regeneration frequency depends on hardness, iron content, household water use, resin volume, programmed capacity, and salt dosage. Because the valve meters actual water use, regeneration adjusts to demand rather than occurring unnecessarily on a fixed schedule.
How does a twin tank softener ship?
Easy one-person installation. The system ships in multiple manageable packages instead of one heavy assembled unit. Using the included funnel, simply pour the resin into the tanks, thread on the control valve, and you're ready to install. Assembly takes just a few minutes.
Expert Sizing and Technical Support
Clean Water Store has specialized in residential and private well-water treatment since 1986. Our water specialists can help you choose the proper twin tank softener based on your actual water analysis and household requirements—not simply the number of bathrooms in the home.
Not sure which size is right? Contact us with your tested hardness, iron and manganese levels, number of occupants, number of bathrooms, plumbing size, well flow rate, and any other water-quality concerns. We can recommend the appropriate system size and provide suggested startup and programming settings.
