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.
How to verify fit before buying Whirlpool WRS325SDHZ Water Filter: Correct Replacement + Alternatives
Treat compatibility as a model-number decision, not a shape-matching exercise. Start with the appliance or system model label, then confirm the exact cartridge or replacement code listed by the manufacturer. Similar-looking filters can use different tabs, seals, RFID features or bypass interfaces, so a cartridge that appears to fit can still leak, restrict flow or fail to lock correctly.
For aftermarket replacements, separate physical compatibility from filtration performance. A seller can correctly state that a cartridge fits a refrigerator while the contaminant-reduction scope differs from the original filter. If lead, cysts, PFAS or another health-related claim matters, verify the exact replacement model in the current certification or performance documentation rather than assuming an OEM-equivalent claim set.
Compare recurring cost, availability and replacement risk
Replacement products should be evaluated over several service cycles. Multiply the current cartridge price by the realistic replacement frequency, add shipping, and check whether the same model is consistently stocked. A low first-purchase price is less useful if the cartridge becomes difficult to source or if replacement intervals are short.
Watch for vague phrases such as “uses certified media” or “tested to a standard.” Finished-product certification is stronger evidence than a statement about one component. For marketplace listings, clear manufacturer identity, exact model numbers, return policies and traceable certification reduce the risk of counterfeit-style or poorly fitting replacements.