Quick take
Use EveryDrop Filter 1 / EDR1RXD1 or a verified compatible replacement. Whirlpool places the filter inside this refrigerator model.
Correct replacement
Whirlpool’s model page identifies EDR1RXD1 as the water-filter part number for WRS571CIHZ.
Filter location
The same specifications list the water-filter location as interior.
Compatible alternatives
Compatible EDR1RXD1 cartridges can reduce recurring cost, but fit alone does not guarantee equivalent contaminant claims.
Best retailer strategy
Compare the exact cartridge across replacement-filter specialists rather than buying the first generic listing.