Product review (5 stars): Works Great
I bought these in addition to the Protec Demineralization Cartridge to cut down on any smell and potential "white dust" that could come out of our daughters humidifier. We had zero build up and things smelt great all winter.

<a data-hook="product-link-linked" class="a-link-normal" href="/Protec-Demineralization-Cartridge-PDC51V1/dp/B000056JFC/ref=cm_cr_arp_d_rvw_txt?ie=UTF8">Protec Demineralization Cartridge PDC51V1</a>