Product review (4 stars): Essick Air Products HDC12
I had placed an order for THIS filter system (Essick Air Products HDC12), but received a replacement instead (ES12).  Unfortunately "I" didn't like the first product (ES12) since it didn't work as well as HDC12, which is the ORIGINAL filter for my humidifier.  Stick with the HDC12, and you won't have any problem.
This time I am trying also the liquid water purifier to see IF it'll work better than what I used so far (plain white vinegar).
I'm glad I found the right filter again.&nbsp;<a data-hook="product-link-linked" class="a-link-normal" href="/Essick-Air-H12-400-3-Speed-Evaporative-Console-Humidifier-Oak-Burl/dp/B0000D8EJU/ref=cm_cr_arp_d_rvw_txt?ie=UTF8">Essick Air H12-400 3-Speed Evaporative Console Humidifier, Oak Burl</a>