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We appreciate you reaching out to us with your inquiry about your Whirlpool® appliances. For your WRS321SDHZ model refrigerator, the correct water filter is EDR1RXD1. To maintain optimal water quality and flow, you should change the water filter cartridge at least every six months. If you notice a significant decrease in water flow to the dispenser or ice maker before the six-month period is up, we recommend replacing the filter sooner. For detailed instructions on how to change the water filter, please refer to page 5 of the Owner's Manual: https://s3.amazonaws.com/sm-backend-production-attachments/userguide-w10407342-revb-eco.pdf.
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