Installation Guide
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INSTALLATION GUIDE
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EFFICIENCY STATEMENTS
SPECIFICATIONS
Name of Substance 
USEPA Max. 
Contaminant Level 
Influent Challenge Level
Barium
2.0 mg/L 10 +/- 10% mg/L
Radium 226/228
5 pCi/L 226/228: 25 pCi/L
Model Rated Efficiency Salt Dosage
Capacity at That 
Dosage
AO-WH-SOFT-
450T
5,210 grains/lb (742 grams/kg) 1.25 lb (0.57 kg) 6,510 grains (422 grams)
AO-WH-SOFT-
PRO-300
5,210 grains/lb (742 grams/kg) 1 lb (0.45 kg) 5,210 grains (338 grams)
AO-WH-SOFT-
PRO-500
5,210 grains/lb (742 grams/kg) 1.66 lb (0.75 kg) 8,650 grains (561 grams)
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):
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
Salt and Capacity Range
Model Minimum Capacity/Salt Middle Capacity/Salt Maximum Capacity/Salt
AO-WH-SOFT-
450T
6,510 grains/1.25lb 35,960 grains/10 lb 45,000 grains/18.75lb
AO-WH-SOFT-
PRO-300
5,210 grains/1lb 20,360 grains/5 lb 30,000 grains/9lb
AO-WH-SOFT-
PRO-500
8,650 grains/1.66lb 33,410 grains/8lb 50,000 grains/15lb
AO-WH-
SOFT-450T
AO-WH-
SOFT-
PRO-300
AO-WH-
SOFT-
PRO-500
Specification
45,000 Grain 
Capacity 
Water 
Softener
30,000 Grain 
Capacity 
Water 
Softener For 
City Water
50,000 Grain 
Capacity 
Water 
Softener
Maximum Capacity - 
grains
45,000 30,000 50,000
Maximum Compen-
sated Hardness - gpg 
(mg/L)
100 90 110
Maximum Ferrous 
Iron Reduction - 
ppm5,6
10 0 10
Minimum pH - 
standard units
7 7 7
Maximum Chlorine 
- ppm
0 3 0
Water & Ambient 
Temperature Mini-
mum-Maximum - °F 
(°C)
40/120 (4/49) 40/120 (4/49) 40/120 (4/49)
Water Pressure 
Minimum - Maximum 
- psi (bar)
20/120 
(1.4/8.3)
20/120 
(1.4/8.3)
20/120 
(1.4/8.3)
Maximum Flow Rate 
to Drain During 
Regeneration gpm 
(L/min)
2 (7.6) 2 (7.6) 2.4 (9.1)
Minimum Water 
Flow for Backwash 
gpm (L/min)
2 (7.6) 2 (7.6) 2.4 (9.1)
Service Flow Rate 
(@15 psi (1.0 bar)) 
drop - gpm (L/min)
8 9.1 7
High Efficiency Salt 
Setting - lb/grains 
removed (kg/grams 
removed)
5/21600 
(2.3/1400)
3/13400 
(1.4/868)
6/26400 
(2.7/1710)
High Efficiency Salt 
Setting - Total Length 
of Regeneration - 
min/gal (min/L)
35/26 (35/98)
27.5/21 
(27.5/80)
42.5/30 
(42.5/114)
High Capacity Salt 
Setting - lb/grains 
removed (kg/grams 
removed)
9/33600 
(4.1/2170)
7/26000 
(3.2/1685)
10/39500 
(4.5/2560)










