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3
Specifications and Performance Claims
This model is efficiency rated. The efficiency rating is valid only at the minimum stated salt dose. The softener has
a demand initiated regeneration (D.I.R) feature that complies with specific performance specifications intended to
minimize the amount of regenerant brine and water used in its operation.
The softener has a rated salt efficiency of not less than 4,000 grains of total hardness exchange per pound of salt (based
on sodium chloride), and shall not deliver more salt than its listed rating or be operated at a sustained maximum service
flow rate greater than its listed rating. This softener has been proven to deliver soft water for at least ten continuous
minutes at the rated service flow rate. The rated salt efficiency is measured by laboratory test described in NSF/ANSI
Standard 44. These tests represent the maximum possible efficiency that the system can achieve. Operational efficiency
is the actual efficiency after the system has been installed. It is typically less than the efficiency, due to individual
application factors including water hardness, water usage, and other contaminants that reduce the softener’s capacity.
This system has been tested according to NSF/ANSI Standard 42 for the reduction of chlorine taste and odor. The
concentration of the indicated substance in water entering the system was reduced to a concentration less than or equal
to the permissible limit for water leaving the system, as specified in NSF/ANSI Standard 42. While testing was performed
under standard laboratory conditions, actual performance of the system may vary based on local water conditions.
Specifications
Model GXMH31H
Rated Capacity* (Grains@ Salt Dose) 11,000 @ 2.6 lbs
24,700 @ 7.8 lbs.
31,100 @ 13.4 lbs.
Rated Efficiency** (Grains/Pound of Salt @ Minimum Salt Dose) 4,240 @ 2.6 lbs.
Water used during Regeneration (gallons/grains) 5.0 /1000
Total Water Used per Regeneration @ Maximum Salt Dose 54.7 gallons
Amount of High Capacity Ion Exchange Resin (lb/cu.ft.) 50.81/0.98
Resin Tank Nominal Size (in., dia. x height) 10 x 40
Service Flow Rate (gpm) 8.0
Pressure Drop at Rated Service Flow (psig) 6.5
Water Supply Maximum Hardness (gpg) 120
Water Supply Maximum Clear Water Iron (ppm)*** 3
Water Pressure Limits (minimum-maximum psi)**** 20-125
Water Temperature Limits (minimum-max. °F) 40-120
Maximum Flow Rate to Drain (gpm) 2.0
Rated Capacity at Chlorine Concentration***** of: 0.50 ppm
0.75 ppm
1.0 ppm
1.5 ppm
2.0 ppm
2,282,000 gal.
1,520,000 gal.
1,140,000 gal.
760,000 gal.
570,000 gal.
This system conforms to NSF/ANSI 42 & 44 for the specific
performance claims as verified and substantiated by test data.
* Testing was performed using pellet grade sodium chloride
as the regenerant salt.
** Efficiency rating is valid only at the lowest stated salt
dosage. These softeners were efficiency rated according to
NSF/ANSI 44.
*** Extent of iron removal may vary with conditions. The capacity
to reduce clear water iron is substantiated by WQA test data.
State of Wisconsin requires additional treatment if water supply
contains greater than 5 ppm clear water iron. Refer to Cleaning
Iron Out of the Water Softening System section.
**** Canada working pressure limits: 1.4–7.0 kg/cm
2
.
***** Typical residential chlorine concentration is 0.5 to 1.0 ppm.
Performance Claims
Contaminant
Influent
Challenge
Level
Maximum
Allowable
Product Water
Level
Barium 10 ±10% mg/L 2.0 mg/L
Radium
226/228
25 pCi/L 5pCi/L
Test parameters include: pH = 7.5±0.5, flow rate
= 7.5 gpm and dynamic
pressure = 35±5 psig
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