PUREBURGReplacement High-efficiency HEPA Filters Compatible with Stadler Form Roger Little Dual Air Purifier R-114,Activated carbon 2-IN-1 Air Clean Dust VOCs,2-Pack

Perfect replacement filter for the Stadler Form Roger Little Air Purifier. Fits perfectly, looks identical to the original, at a price that makes it affordable to maintain the Roger Little for optimal performance and healthy air. Very easy to switch out--look for Stadler's video on YouTube for a demonstration. I have been very happy with the Roger Little, and all the Stadler line from Switzerland.

So far I perceive no difference between these filters and the name filters. I'm very pleased and have to say these are a great deal.

Arrived at the promised time, and product responds to it's demands.

Cheap replacament, thinner material, wont buy again, would rather buy original.

I asked the manufacturer how much activated carbon they used in their product and how it compares to Stadler Form's own filters, and they were unable to comment. So I don't know exactly how it compares but I haven't noticed much difference. I would assume they are as good on the dust side and possibly not quite as good on the smells side but can't say for sure.

Let's start with the estimated replacement time, 3/6 months, this is half of the suggested time for the original filters.This filters as shown in the pictures are not as thick as the original, therefore they won't filter as well.The original filters are capable of filtering PM0.255 100% efficiently.So I don't think this product is worth the money, it can filter efficiently 2500 nanometers particles and formaldehyde but it won't "purify" the air as it won't remove bacterias, acars and viruses as well.