
Waterspecialist WS638B Water Filter
A certified two-pack replacement filter for anyone who already owns a system that takes a WS638B-size cartridge.
- External Testing Certification
- NSF
- Number Of Packs
- Not specified
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A certified two-pack replacement filter for anyone who already owns a system that takes a WS638B-size cartridge.

Worth considering once you have confirmed the cartridge dimensions match your system; the NSF certification is the standout data point here.

The dual NSF certification is a genuine positive; confirm your fridge's filter part number matches RWF4700AC before ordering a 4-pack.

A straightforward certified replacement cartridge for existing WD-F32 owners; check your housing's part number match before buying.

A cartridge worth considering if its 3.2 x 3.2 x 10.4 inch size matches your housing, though the absence of listed compatible models means measuring first.

A direct-fit replacement filter for the LG LFX25974ST refrigerator, built around WQA-certified coconut carbon block filtration media.

An NSF certified 3-pack built specifically for the Equator OR400, suited to owners who would rather stock up on replacement filters at once.

A WQA and IAPMO certified single filter, though the listing gives little beyond certification and weight, so fitment confirmation matters more here than usual.

A straightforward two-pack replacement cartridge with NSF certification. Good value if you confirm the sizing matches your existing housing first.

A single NSF-certified cartridge from an established filter brand, though this listing gives little beyond certification to judge fit against. Confirm compatibility elsewhere before ordering.

An NSF-certified replacement filter cartridge sold in a 3-pack, worth it once you confirm the dimensions match your existing housing.

A dual certified 2 pack fridge filter that reads well on paper, but fitment has to be confirmed separately since this listing names no compatible models.

A 5-pack of NSF certified, standard-size RO replacement cartridges for owners who want spares on hand for scheduled filter changes.

A carbon filter cartridge with an unusually thorough certification list, well suited to buyers who've already confirmed it matches their appliance's filter part number.

A carbon fiber replacement cartridge with IAPMO certification, worth buying once you've confirmed it matches your housing's dimensions.

A multi-media replacement filter with ANSI, NSF and WQA certification, worth it once you've confirmed the part number fits your housing.

A Culligan branded HAF-CIN water filter. With no spec sheet attached, confirm model compatibility with your system before ordering.

A straightforward swap for GE refrigerators built around the WR17X30702 filter slot, though buyers should confirm the part number on their old cartridge before ordering.

A 4-pack of ANSI-certified replacement cartridges worth considering if the 2.5 x 2.5 x 6.4 inch size matches your filter housing.

A two-pack replacement filter positioned as a GE RPWF equivalent, NSF certified and reasonably priced by volume. A sensible pick if your fridge takes this cartridge style.

A single NSF certified replacement filter sized specifically for the Samsung RF263BEAESR refrigerator, worth checking against your own model number first.

A certified replacement filter with a clearly stated fit for the GE GNE27JGMWW, and a 4-pack that covers a longer stretch of replacements.

A replacement filter with a strong review average but no published specs, so it works best once you've confirmed the part number matches your system.

A dual certified, coconut carbon replacement filter sold in a 3 pack, reasonable once you know it matches your system's original filter.
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