24,000-Grain Continuous Soft Water Twin Tank Water Softener

Continuous soft water for smaller homes, moderate water use, and demanding well-water applications.

Never run out of soft water while your system regenerates. This advanced twin tank water softener uses two full-size resin tanks to supply softened water 24 hours a day. One tank supplies soft water to the home while the second tank remains regenerated and ready for service. When the operating tank reaches its programmed capacity, the system automatically switches to the standby tank and regenerates the exhausted tank.

Also known as a dual tank water softener, twin alternating water softener, or continuous-duty water softener, this system is designed for homeowners who want dependable soft water without the temporary hard-water bypass that can occur when a conventional single-tank softener regenerates.

The system features an advanced Bluetooth-enabled control valve, premium ResinTech® CG10 10% crosslinked resin, demand-initiated regeneration, softened-water regeneration, fully adjustable operating cycles, and a 9-volt battery-backup feature.

Made in the USA by Chandler Systems

The Bluetooth-enabled control valve is made in the USA by Chandler Systems, Inc. of Ashland, Ohio. Chandler Systems manufactures the valve's components in the United States, including the circuit boards and molded valve components, and completes the valve assembly and testing at its Ohio facilities.

Chandler Systems has decades of experience designing and manufacturing innovative water-treatment equipment. The Legacy View control combines American manufacturing with modern Bluetooth setup, advanced diagnostics, demand-initiated regeneration, and dependable twin-tank operation.

Never Run Out of Soft Water Again

A conventional single-tank water softener cannot soften water while its resin tank is regenerating. Depending on the valve and installation, untreated hard water may temporarily bypass the softener until regeneration is complete.

This twin alternating system solves that problem by using two separate mineral tanks:

• One tank supplies softened water to the home.
• The second tank remains fully regenerated and ready for use.
• When the operating tank reaches capacity, the valve automatically switches to the standby tank.
• The exhausted tank regenerates using softened water.
• After regeneration, that tank returns to standby.
• The process repeats automatically based on actual water use.

Because one regenerated tank is always available, the system can provide continuous soft water 24 hours a day, including while the other tank is regenerating.

24,000 Grains of Nominal Capacity Per Tank

Each mineral tank contains 0.75 cubic foot of premium ion exchange resin. Using the standard nominal rating of 32,000 grains per cubic foot, each tank is classified as a 24,000-grain water softener.

• 24,000 grains nominal capacity per tank
• 0.75 cubic foot of resin per tank
• 1.5 cubic feet of total installed resin
• 48,000 grains of combined nominal installed capacity

The tanks operate alternately. One 24,000-grain tank is normally in service while the second tank is regenerated and waiting in standby.

As with all water softeners, the most salt-efficient programmed capacity is generally lower than the theoretical maximum. The manufacturer lists an operating capacity of approximately 20,000 grains per tank. Clean Water Store can help determine the best operating capacity and salt setting based on your hardness, iron level, household water use, and desired efficiency.

Bluetooth Setup, Monitoring, and Diagnostics

The Bluetooth-enabled control valve provides a modern and convenient way to set up the system, review operating information, and access advanced diagnostics from a compatible smartphone or tablet.

Instead of relying only on abbreviated programming codes displayed on the control valve, the Legacy View Bluetooth application presents settings and diagnostic information in an easier-to-read format.

Bluetooth Control Advantages

• Simplified setup and programming
• Convenient access from a compatible mobile device
• Easier-to-read operating information
• Advanced system diagnostics
• Convenient adjustment of regeneration settings
• Easier troubleshooting and technical support
• Access to fully adjustable regeneration cycles

The water softener does not need to remain connected to a phone during normal operation. Once properly programmed, the control valve automatically meters water use, switches tanks, and initiates regeneration as needed.

A Modern Alternative to Traditional Twin-Tank Controls

Traditional twin alternating water softeners have long been used in homes and businesses that require uninterrupted soft water. However, many older control valves require programming and diagnostics to be performed directly from a small valve display.

This system retains the proven twin alternating design while adding Bluetooth setup, mobile-device diagnostics, flexible programming, and a battery-backup feature.

For homeowners comparing this system with a Fleck 9100SXT or another conventional twin alternating softener, the primary advantages are Bluetooth-enabled setup and diagnostics, flexible programming, battery backup, an American-made control valve, and premium ResinTech CG10 resin.

Premium ResinTech® CG10 10% Crosslinked Resin

The control valve operates the water softener, but the resin is the material that actually removes hardness minerals from the water. This system includes genuine ResinTech CG10 strong-acid cation exchange resin.

Many residential water softeners contain standard 8% crosslinked resin or resin that is not clearly identified. This system uses premium 10% crosslinked resin for greater physical durability and improved resistance to oxidation compared with standard 8% resin.

Advantages of ResinTech CG10 Resin

• Premium 10% crosslinked construction
• 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 applications
• Long service life when properly operated and maintained

Each mineral tank contains 0.75 cubic foot of ResinTech CG10 resin, for a total of 1.5 cubic feet across the complete system.

Demand-Initiated Regeneration Saves Salt and Water

The control valve includes an electronic water meter that measures actual household water consumption. The system regenerates according to gallons used and programmed softening capacity rather than regenerating unnecessarily on a fixed calendar schedule.

Demand regeneration helps:

• Reduce unnecessary regeneration cycles
• Match system operation to actual household water use
• Improve salt efficiency
• Reduce unnecessary regeneration water use
• Maintain a regenerated standby tank
• Provide consistent soft water during changing demand

The valve can be programmed according to water hardness, iron content, resin volume, salt dosage, and household water use.

Regenerates with Softened Water

During regeneration, the tank remaining in service supplies softened water to the tank being regenerated. This is an important benefit of the twin alternating design.

Using softened water for regeneration provides a more consistent brining and rinsing process and reduces the introduction of untreated hardness into the regenerating tank.

9-Volt Battery-Backup Feature

The control valve can use a standard 9-volt battery to support important metering and valve-position functions during a power interruption.

The battery backup keeps the electronic meter active and can allow the control valve to move to its shutoff position if a power failure occurs while the system is regenerating.

The system normally operates from a low-voltage 12 VDC power supply connected to a standard household electrical outlet.

Five Fully Adjustable Regeneration Cycles

The control valve provides five fully adjustable operating cycles, allowing the system to be configured for the home's water chemistry, water use, and desired efficiency.

Adjustable programming options include:

• Backwash time
• Brine draw and slow rinse
• Rapid rinse
• Brine refill
• Regeneration sequence and timing

An optional double-backwash feature can be selected when additional resin-bed cleaning is appropriate. The valve also provides treated-water brine refill with a pre-brine option.

Ideal for Smaller Homes and Continuous Water Demand

This 24,000-grain-per-tank water softener is designed for smaller residential applications where dependable soft water and continuous service are important.

Recommended Applications

• One- to three-person households
• Smaller homes and cottages
• Homes with one or two bathrooms
• Homes with moderate daily water consumption
• Private well-water systems
• Homes with hard or very hard water
• Homes with varying water-use schedules
• Vacation rentals and guest homes
• Selected light-commercial applications
• Applications where hard-water bypass during regeneration is undesirable

Proper sizing should be based on the number of occupants, tested hardness, dissolved iron and manganese, daily water use, plumbing size, and required service flow—not bathroom count alone.

Benefits of Soft Water Throughout Your Home

• Reduces hardness scale in pipes and plumbing fixtures
• Helps protect water heaters from mineral accumulation
• 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 dishwashers, washing machines, and other water-using appliances
• Provides a more pleasant bathing and washing experience

Twin Tank vs. Single-Tank Water Softener

A single-tank softener may be adequate for a small or moderately sized household. A twin alternating system is most valuable when uninterrupted soft water and dependable service during periods of changing water use are priorities.

Complete Water Softener System

• American-made Bluetooth control valve manufactured by Chandler Systems in Ashland, Ohio
• Bluetooth-enabled twin alternating control valve
• Electronic demand water meter
• Two polyglass mineral tanks
• 0.75 cubic foot of ResinTech CG10 resin per tank
• 1.5 cubic feet of total softening resin
• Internal distributor tubes and baskets
• Proprietary two-valve bypass assembly
• 1-inch male NPT plumbing connections
• Polyethylene brine tank
• Brine tank grid
• Brine well and safety float assembly
• Brine tubing
• Low-voltage power supply
• Installation and programming instructions
• Clean Water Store technical support

This water softener ships unassembled in multiple boxes. The mineral tanks, resin, control valve, brine tank, and installation components may ship as separate UPS Ground packages. Multiple tracking numbers may be provided, and individual packages may arrive on different days.

Product Specifications

Actual flow rate, operating capacity, regeneration frequency, salt use, and regeneration water consumption depend on incoming pressure, plumbing size, hardness, iron, manganese, daily water use, salt setting, and system programming. Package weights and dimensions may vary.

Frequently Asked Questions

What is a twin tank water softener?

A twin tank water softener uses two resin tanks instead of one. One tank supplies soft water while the second tank remains regenerated and ready. When the operating tank reaches its programmed capacity, the valve automatically switches tanks and regenerates the exhausted tank.

Is a dual tank water 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 automatically enters service while the exhausted tank regenerates, allowing the system to continue supplying softened water.

Is this system 24,000 grains or 48,000 grains?

Each tank contains 0.75 cubic foot of resin and has a nominal capacity of 24,000 grains. The complete system contains 48,000 grains of combined nominal installed capacity. However, the tanks alternate, so one 24,000-grain tank is normally in active service at a time.

Why does the manufacturer also list a 20,000-grain capacity?

Twenty-four thousand grains is the nominal maximum rating based on 32,000 grains per cubic foot. The manufacturer lists approximately 20,000 grains as the practical operating capacity for each tank.

Is the control valve made in the United States?

Yes. 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 the valve assembly and testing at its Ohio facilities.

Does a twin tank water softener use twice as much salt?

No. Both tanks do not regenerate at the same time. Only the exhausted tank regenerates. Salt consumption depends on hardness, iron, water use, programmed capacity, and the selected salt setting.

What does the Bluetooth feature do?

The Legacy View Bluetooth application provides a convenient interface for setup, programming, operating information, and advanced diagnostics using a compatible smartphone or tablet.

Does the system require Bluetooth to operate?

No. Once the control valve is properly programmed, the system operates automatically. Bluetooth is a convenient setup and diagnostic tool.

Does Bluetooth mean the softener connects to Wi-Fi?

No. Bluetooth communicates locally with a compatible mobile device. It does not require the control valve to connect directly to the home's Wi-Fi network.

What happens if the power goes out?

Water can continue to pass through the plumbing during a power outage. The 9-volt battery-backup function keeps the electronic meter active and can allow the valve to move to a shutoff position if power fails during regeneration. Automatic tank switching and regeneration require normal electrical power.

What is 10% crosslinked resin?

Crosslinking refers to the internal structure of the resin beads. ResinTech CG10 uses a 10% crosslinked structure, which provides greater physical durability and improved oxidation resistance compared with common 8% residential resin.

How long does water softener resin last?

Resin life depends on chlorine exposure, iron, manganese, sediment, water chemistry, regeneration settings, and maintenance. Premium 10% crosslinked resin can provide many years of service when the system is properly sized, programmed, and maintained.

Can this system treat well water?

Yes. This system is well suited for many private well-water applications. A complete water analysis is recommended because iron, manganese, sulfur, sediment, low pH, tannins, or bacteria may require additional treatment.

Will this system remove iron?

A water softener can remove limited amounts of clear-water dissolved ferrous iron. Iron consumes softening capacity and may foul resin. Moderate or high iron, oxidized iron, iron bacteria, manganese, or sulfur odor may require dedicated pretreatment.

Can it remove manganese?

The resin may remove limited amounts of dissolved manganese under suitable conditions, but manganese removal depends on pH, oxidation state, competing hardness, and overall water chemistry. A water analysis is required before relying on a softener for manganese treatment.

Will it remove sulfur odor?

No. A conventional ion exchange water softener is not designed to remove hydrogen sulfide odor. Sulfur odor normally requires an appropriate oxidation and filtration system installed ahead of the softener.

Can this system be used on chlorinated city water?

Yes. Premium 10% crosslinked resin provides improved chlorine resistance compared with standard 8% resin. Where chlorine or chloramine levels are high, carbon filtration ahead of the softener may further protect the resin and improve water quality.

How often will the system regenerate?

Regeneration frequency depends on water hardness, iron content, household water use, programmed capacity, and salt dosage. Because the system meters actual water use, regeneration adjusts to household demand.

How much salt will it use?

Salt consumption depends on the programmed salt dosage and how frequently each tank regenerates. Clean Water Store can help select settings that balance salt efficiency, operating capacity, and regeneration frequency.

What type of salt should I use?

High-quality water softener pellets or solar salt crystals are generally recommended. Potassium chloride may also be used, although it costs more and may require changes to the system programming.

What is the service flow rate?

The manufacturer lists a service flow rate of approximately 8 gallons per minute through the active tank. Actual usable flow depends on incoming pressure, plumbing diameter, water chemistry, resin condition, and acceptable pressure loss.

How much space does the system require?

The listed system footprint is approximately 16 inches by 34 inches by 52 inches. Additional space should be provided for plumbing connections, adding salt, assembling the equipment, and servicing the control valve.

Can I install it myself?

Experienced do-it-yourself homeowners and plumbers can install the system. Installation requires assembling the tanks and valve, loading the resin, connecting the inlet, outlet, bypass, drain and brine lines, and completing proper startup and programming. Applicable plumbing codes must be followed.

Does the system come programmed?

Final programming should be based on the customer's tested hardness, iron level, water use, and desired salt efficiency. Clean Water Store can provide recommended programming information for the application.

Is a twin tank water softener better than a single-tank softener?

A twin tank system is better for applications requiring uninterrupted soft water, greater operating flexibility, or dependable service during changing water demand. A properly sized single-tank softener may be the more economical choice for smaller households with predictable demand.

How does this compare with a Fleck 9100SXT?

Both systems use the proven twin alternating principle and can provide continuous soft water. This system adds a Made-in-USA Chandler Systems control valve, Bluetooth-enabled setup and diagnostics, five fully adjustable cycles, a 9-volt battery-backup feature, and premium ResinTech CG10 10% crosslinked resin.

How does the water softener ship?

The system ships unassembled in multiple boxes by UPS Ground. The control valve, two mineral tanks, resin, brine tank, and installation components may be packaged and shipped separately. Multiple tracking numbers may be provided, and the packages may arrive on different days.

Does the system arrive fully assembled?

No. To make the system practical to ship and carry into the installation location, the major components ship separately. The installer must assemble the valve and tanks, load the resin, connect the plumbing, drain and brine lines, and complete startup and programming.

Why are the resin and mineral tanks shipped separately?

Shipping the resin separately keeps the individual packages more manageable and helps reduce the risk of damage during transportation. It also makes it easier to move the components into a basement, garage, pump house, or utility room before assembly.

What is the total shipping weight?

The estimated combined shipment weight is approximately 139 pounds. This is divided among multiple UPS Ground packages rather than shipped as one 139-pound carton. Actual package weights may vary.

Why Buy from Clean Water Store?

• Water treatment specialists since 1986
• Over 70,000 customers served
• Specialists in private well-water treatment
• Made-in-USA control valve manufactured by Chandler Systems in Ashland, Ohio
• Premium ResinTech CG10 10% crosslinked resin
• Expert sizing based on actual water conditions
• Programming recommendations for salt efficiency and capacity
• Installation and startup assistance
• Technical support before and after purchase
• Replacement parts and long-term service support

Not sure whether this is the correct size? Contact Clean Water Store with your hardness, iron, manganese, number of occupants, number of bathrooms, well flow rate, plumbing size, and any additional water-quality concerns. We can help determine whether this twin tank system is the right choice and provide recommended startup settings for your application.