Quick take
Buy EveryDrop Filter 1 / EDR1RXD1 or a compatible cartridge explicitly listed for this model. Certification and fit should be checked separately.
Correct filter code
Whirlpool lists EDR1RXD1 for WRS588FIHZ.
Why exact model pages convert
Owners often know the refrigerator model but not the cartridge number. Mapping the model to EDR1RXD1 removes the final friction before checkout.
Compatible options
Replacement specialists can offer lower-cost cartridges for the same filter family.
Certification check
Do not assume every EDR1RXD1-compatible cartridge carries the same claims as EveryDrop OEM.