EcoWater’s elite water softener system is our refiner, available in a  single-tank design. It is highly recommended for municipal water supplies.

The ERR 3700 comes with automatic salt-level detection, which means no salt level setting required.  The integrated sensor alerts you when salt is low.

Features of the ERR 3700 Series:


HydroLinkPlus® Wi-Fi and Smartphone App Monitoring

HydroLinkPlus® – Wi-Fi enabled technology sends continuous and excessive water use, system error, low salt and service reminder alerts, including a water-to-drain sensing alert notifying you when an excessive amount of water is going to drain. HydroLink® – Patented two-way remote monitoring also available.


Patented Electronics Digital Demand Module

Sophisticated, yet easy-to-use electronics capture historical usage patterns to predict future needs for precise regenerations.


High Quality Fit and Finish with Dampened Hinge Salt Cover


Multi-Wrap Fiberglass Reinforced Resin Tank

Durable tank liner will not deteriorate, rust, or corrode.


Coconut-Shell Carbon with Lifetime Warranty

Filters the water throughout the home without compromising water flow. Reduces chlorine taste and odor, extends resin life and eliminates the need for a separate carbon filter and filter changes.


Patented Stratified Resin Bed with Lifetime Warranty

Layered mix of fine and standard size resin provides superior filtration and iron removal without sacrificing flow rate capability.


Full One-Inch Riser with Self-Cleaning Distributors

One-inch diameter for increased flow rates, which ensures that household demand is adequately met. Distributors exhibit excellent flow rates and are cleaned automatically by counter-current water pressure


Positive-Action Brine Valve

Snap-together construction eliminates use of solvents that may contaminate water.  Positive action helps prevent overfilling.

ERR 3700 Series Dimensions


ERR 3700 Series Specifications

Efficiency (gr./lb. @ salt dose) 4,100 @ 2.4
Hardness Capacity (gr. @ max. lb. salt dose) 20,900 @ 8.9
Certified Flow Rate (gpm @ psi) 8 @ 7
Intermittent Flow Rate (gpm @ psi)1  14.8 @ 15
Intermittent Flow Rate (gpm @ psi)1 23.6 @ 30
Stratified Resin Bed (lbs.) 38
Quartz Gravel Base (lbs.) 10
Maximum Water Hardness (gpg @ 500 gpd water usage) 50
Maximum Clear Water Iron (ppm-Fe)2 10
Maximum Chlorine (ppm) 4
Approximate Water Used Each Regeneration (gal.)2 39
Salt Storage Capacity (lbs.) 200
Supply Water Pressure Limits (psi)3 20 - 125
Supply Water Temperature Limits (oF/oC) 40-120 / 4-38
Chlorine Taste & Odor Reduction (gal. at 1.0 ppm)4 1,460,0005
Ambient Temperature Range (oF/oC) 35-150 / 2-66
Plumbing Connection Provided (inches) 1
Electrical Requirement, 120V, 50/60Hz, (24V DC, 500mA, power supply included)

1 Intermittent flow rate does not represent the maximum service flow rate used for determining the refiner’s rated capacity and efficiency. Continuous operation at flow rates greater than the certified flow rate may affect capacity and efficiency performance. The validity of these flow rates is verified by NSF.

2 When operated at 35 psi water pressure.

3 Maximum pressure for Canadian use is 7.0 Kg/cm2 .

4 Typical residential chlorine concentration is 0.5 to 1.0 ppm.

5 From independent laboratory test data.

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