North Star NST70UD1 Water Softener Two-tank Model - 70,000 Grain Capacity - Ultra Demand High Flow

by North Star
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About the North Star NST70UD1 Water Softener Two-tank Model - 70,000 Grain Capacity - Ultra Demand High Flow

Own the most powerful water softening system available for residential use. The North Star NST70UD1 Water Softener is a two-tank design that makes installation easier than bulky single-tank models. The compact footprint of the North Star NST70UD1 saves space, reduces maintenance, and cuts your expenses on appliance repairs or repairs to your household plumbing. On average, North Star systems pay for themselves in a matter of years through savings on repairs, and maintenance.

North Star is the world’s leading manufacturer of water softeners, having over 85 years experience in the industry. North Star manufacturer residential and commercial systems, putting the same technology as a large commercial unit, in the compact size designed for your home.

The North Star NST70UD1 has 70,000 Grain Capacity and will service larger households where smaller units do not suffice. The NST70UD1 will remove deposits from a standard flow of 14 gallons per minute, or what is typical for up to 8 people with a water hardness rating of over 20 grains.

Advanced Features Include:

“Look Ahead Technology”: The intelligent patented monitoring system that actually learns your water usage patterns and becomes more efficient as it learns.  The North Star NST70UD1’s “Look Ahead” also calculates an accurate proportion of salt and water is needed to regenerate only the used sections of the resin beads, saving you salt and water.

Super Cap Time Keeper: In the event of power failure, The North Star NST70UD1 will remain on for 72 hours, and will retain all memory data. After the 72 hour reserve period, the unit will turn off, keeping all data stored until power is restored.

No-worry Setting: There is no need to power off your North Star softener unit when on vacation, the unit will recognize that you are not using water, and will not over-generate.

Counter-Current Regeneration: Pioneered by North Star, the brine water method of regeneration draws brine water into the resin tanks, enhancing the process, and greatly increasing efficiency.

High Capacity Resin is the most efficient and long lasting resin of its kind, with the resin bed agitator, preventing collection of iron, dirt, and solids; keeping the North Star NST70UD1 operating at peak efficiency.

Runs on 24V Electricity to reduce electrical safety hazards.

Additional Information:

Spec Data Sheet 


  • Removes Minerals such as Calcium and Magnesium 
  • Protects your plumbing, faucets, appliances, and water heater from mineral deposits and build-up
  • Leaves dishes cleaner and spot free
  • Increases water heater efficiency by up to 29%
  • Energy Efficient system pays for itself through energy, water, salt, and soap / detergent savings


  • Max Capacity: 70,000 Grains
  • Resin: 1.94 Cubic feet
  • Connection Size: 1" 
  • High Flow Valve
  • Rates Service Flow Rate: 14 GPM
  • Intermittent Flow Rate: 14.5 GPM
  • Rated Clearwater Iron Removal: 19 PPM
  • Electronics: Ultra Demand 
  • Efficiency: 5120 Grains per lb. of Salt
  • Dimensions: 64" H  x 14" W x 39" D
  • Connection height: 55-1/2" from the bottom of the unit

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