Efficiency Statements - A.O. Smith Pro AOW-S400 Owner's Manual

EFFICIENCY STATEMENTS

18
This product is efficiency rated according to NSF/ANSI 44. The stated efficiencies are valid
only at the specified salt dosage and 7.0 gpm (26.5 L/min):
Model
AOW-S400
AOW-S500
An efficiency-rated water softener is a demand-initiated regeneration softener that also
complies with specific performance specifications intended to minimize the amount of
regenerant brine and water used in its operation.
Efficiency-rated water softeners shall have a rated salt efficiency of not less than 3,350
grains of total hardness exchange per pound of salt (based on NaCI equivalency) (477 grams
of total hardness exchange per kilogram of salt), and shall not deliver more salt than its
listed rating.
Efficiency is measured by a laboratory test described in NSF/ANSI 44. The test represents
the maximum possible efficiency that the system can achieve. Operational efficiency is the
actual efficiency achieved 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 contaminates that reduce the softeners' capacity.
Reduction Capabilities for Specific Contaminants
Name of Substance
Barium
Radium 226/228
Salt and Capacity Range
Model
AOW-S400
AOW-S500
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Rated Efficiency
5,210 grains/lb (742 grams/kg)
5,210 grains/lb (742 grams/kg)
USEPA Max.
Contaminant Level
2.0 mg/L
5 pCi/L
Minimum Capacity/Salt
5,210 grains/1lb
8,650 grains/1.66lb
Salt Dosage
1 lb (0.45 kg)
1.66 lb (0.75 kg)
Influent Challenge Level
10 +/- 10% mg/L
226/228: 25 pCi/L
Middle Capacity/Salt
28,775 grains/8 lb
33,410 grains/8lb
Capacity at That
Dosage
5,210 grains (338 grams)
8,650 grains (561 grams)
Maximum Capacity/Salt
34,800 grains/15lb
49,800 grains/15lb