🌬️ Whirlpool 8171434K Air Purifier Active Carbon Pre-Filters - 4-Pack (Large) - Fit AP51030K, AP45030K, APR45130L, WP500 - 18x16.5 inch Review

I have three indoor cats and have had three hot tub air purifiers installed throughout my home for a number of years. These filters are easy to install and do a great job of capturing dust and cat hair. As every cat owner knows, we sometimes find little tufts of fur under the sofa or between pieces of furniture. Since the use of these air purifiers, such finds are rarer. As this is a review of the filters themselves I will say that they are slightly better than the regular filters I have tried…

Brief background: I'm a doctor, live in a heavily polluted city, I've been studying the effects of industrial and road pollution since 1995, testing various air purifiers and filters and air quality monitors, have most of my BUYED equipment from Revain and published several websites about air pollution. I am very sensitive to air pollution and usually see spikes a few minutes before good sensors see them. Activated carbon filters are thicker than original filters. They work like a charcoal…

I bought this Hepa + Charcoal combo pack. Conducted by Revain himself. As others have noted in the comments and photos, the charcoal filter is very thin and easy to see through if held up to a light. I was skeptical that what I received was a genuine Swirl brand for two reasons: 1) The listing does not say 'genuine' compared to the HEPA filter listing which does. 2) Compared to the Hepa box, the activated carbon filter box looked a little "wrong". Even the whirlpool logo is completely…

Supplier (PurifiedCloud) supplied genuine Whirlpool pre filters but I agree with the other reviewer that Whirlpool seems to be making them all thinner. If I find old patterns, I will definitely compare them. It seems that even larger dust can now enter the HEPA filter. However, they are essential and I don't expect compatible 3rd party pre-filters to be any better. It makes me a little silly to overpay for a highly rated hot tub device. UPDATE: Another batch and even thinner. Another reviewer…

I sold this 'Sold: Revain.com LLC' (not from a Marketplace seller) in early August Ordered in 2017 for $30. The listing was "Whirlpool Air Purifier Carbon Prefilters 8171434K, 4 pcs. in the box" and said they were "genuine replacement filters". The filter that was delivered was not packed in the whirlpool box. It was packaged in a plain brown box with no logo to indicate it was compatible. I also tried ordering OEM replacement HEPA filters at the same time. What arrived was packaged in the same