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| WARRANTY | Series 4000 | SmartChoice II | SmartChoice II HE | SmartChoice II Twin |
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| Labor | 1 Year (with Aqua Installation) | 7 Years | 7 Years | 7 Years |
| Parts | 5 Years | 7 Years | 7 Years | 7 Years |
| Salt Tank | 5 Years | Lifetime | Lifetime | Lifetime |
| Mineral Tank | 10 Years | Lifetime | Lifetime | Lifetime |
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| EFFICIENCY | Series 4000 | SmartChoice II | SmartChoice II HE | SmartChoice II Twin |
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| Ultra Low Power Consumption | |  | | |
| Advanced Diagnostics | | | | |
| Energy-Saving Auto Display Turn Off | | | | |
| Uses 50% less salt and 50% less water | | | | |
| 24-hour Soft Water | | | | |
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| DESIGN | Series 4000 | SmartChoice II | SmartChoice II HE | SmartChoice II Twin |
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| Modular Design | | | | |
| Built with non-corrosive materials | | | | |
| Lithium Battery Backup | | | | |
| Smart Regeneration Technology | | | | |
| Smart Control Valve | | | | |
| Bypass Valve | | | | |
| Two Water Tanks | | | | |
| WiFi Connectivity Availability | | | | |
| City Water | | | | |
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| MAINTENANCE | Series 4000 | SmartChoice II | SmartChoice II HE | SmartChoice II Twin |
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| Exchangeable Parts | | | | |
| Service Alerts | | | | |
| Free Installation | | | | |
