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Protec PDC51 Demineralization Cartridge

OEM part number(s): PDC51, PDC51V1, DC-51 (ReliOn / Walgreens / Sunbeam) · Made by Protec (Kaz) for Vicks ultrasonic models · Demineralization cartridge

Lowest verified price: none captured yet — see the notes below. The Amazon button below is the current buy route.

Buy on Amazon — PDC51Amazon search for the exact part number (no single listing is endorsed). Amazon price is shown on Amazon; we do not quote it here.

Verified prices (checked 2026-11-11)

Option	Price	Store & shipping

FiltersFast lists the genuine PDC51 at $19.95 but it was OUT OF STOCK when checked 2026-11-11, so no in-stock shipped price is quoted here. A Kaz parts listing showed $13.92 for PDC51V1; not treated as verified retail stock.

How to read this: the lowest verified price above is the headline even when it is not Amazon. Amazon is the buy button because it is this site's affiliate route; its price is not quoted because Amazon blocks automated price reads.

Exact fit — models that take this part

Vicks V4600, Vicks V5100, Vicks VUL575

How many per change: One cartridge in the tank cap area per change.

Specifications

Replacement interval	Replace every 2–4 weeks or every 15–30 fillings (FiltersFast spec).
Treatment	Demineralization cartridge: reduces minerals that cause white dust from ultrasonic humidifiers.

Equivalents and cross-references

Brand	Part number	Note
No credible aftermarket equivalent verified.

Sources

https://www.filtersfast.com/P-ReliOn-DC-51-Humidifier-Demineralization-Cartridge.asp

Full record, including descriptor data for every model, is in the open dataset: /data/parts.json.