American Standard 48,000 Grain Whole-House Water Softener
Model AST-SD-48
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Power
120V AC
Warranty
10 years tanks, 5 years valve
Flow Rate
12 GPM service
Brine Tank
250 lb salt capacity
Dimensions
10" x 54" mineral tank; 15" x 33" brine tank
Connections
1" NPT
American Standard 48,000 Grain Whole-House Water Softener Review
The American Standard AST-SD-48 is a whole-house 48,000-grain salt-based softener suited for 3-6 person households or homes with hardness above 15 GPG. The 1.5 cubic foot high-capacity cation exchange resin bed delivers 12 GPM at service, supporting simultaneous operation of multiple showers, appliances, and irrigation zones without pressure drop. The Fleck-compatible digital control valve uses demand-initiated regeneration with a configurable reserve capacity to prevent hardness breakthrough. Iron removal capacity reaches 3 PPM clear water iron without a dedicated pre-filter in most municipal water supplies. The 250-lb brine tank and the included bypass valve assembly simplify installation for plumbers and experienced DIYers.
Pros
- 12 GPM flow handles large households
- 48,000 grains suits high-hardness areas
- Fleck-compatible control valve has wide service network
- NSF 44 certified
Cons
- Larger footprint requires dedicated utility space
- Higher upfront cost than compact models
Full Specifications
Brand
American Standard
Model Number
AST-SD-48
Power
120V AC
Warranty
10 years tanks, 5 years valve
Flow Rate
12 GPM service
Brine Tank
250 lb salt capacity
Dimensions
10" x 54" mineral tank; 15" x 33" brine tank
Connections
1" NPT
Iron Removal
Up to 3 PPM clear water iron
Resin Volume
1.5 cubic feet
Certifications
NSF/ANSI 44
Grain Capacity
48,000 grains
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