Quick take
The OEM replacement is EveryDrop Filter 1 / EDR1RXD1. Compatible Filter 1 cartridges can cost less, but verify fit and certification before buying.
Correct filter for WRS325SDHZ
Whirlpool’s model specifications list water filter part number EDR1RXD1 and an exterior filter location for WRS325SDHZ.
OEM vs compatible
EveryDrop Filter 1 is the low-ambiguity OEM choice. Discount Filter Store, National Filter Warehouse and GlacierFresh can offer lower-cost compatible options.
What to verify before checkout
Confirm the listing explicitly names WRS325SDHZ or EDR1RXD1, then compare certification scope and seller return policy.
Replacement timing
Use the refrigerator indicator and cartridge instructions rather than waiting for obvious taste or flow problems.