One of the most popular units on Amazon’s Top 100 air purifiers list is the GermGuardian AC4800 and for good reason. Germguardian air purifiers are a good balance of raw filtering power paired with cost effectiveness. These units are quality built, come with a standard suite of features and cost a lot less than some of the other more popular brands. The most popular units that Germguardian sells are the FLT4825 / AC4800 Series for small to medium sized rooms, the FLT5000 / AC5000 for medium to large sized rooms, FLT4100 which makes an excellent desktop top air purifier, and the new FLT5900 / AC5900WCA, which is a compact air purifier that is similar to the Honeywell HPA200-300. Their air purifiers are low cost, efficient, and are good for pets. They come with all the standard features you would look for in a quality air purifier such as simple settings, multiple fan speeds, filter change indicator lights, oscillation settings and auto shutdown timers. GermGuardian OEM filters are among the cheaper of the OEM filter market, but still are considerably more expensive than most aftermarket competitors offering, Breathe Naturally included. Breathe Naturally MERV 17 HEPA filters stop harmful airborne particles down to 0.03 microns small at a 99.97% efficiency level. Capture mold spores, dust, dander, pollen, bacteria, virus carriers, and tons more airborne particles, leaving the air you breathe clean and healthy. Our filters are perfect for those with seasonal allergies, sensitive respiratory systems, and people who just want to Breathe Naturally. Breathe Naturally carbon filters are made from Bamboo carbon and are proudly made here in the USA, supporting American companies and jobs. We take pride in our specially designed carbon filters that are made to be thicker, last longer, and capture more odors and particles that ultimately lead to a longer lifespan on your HEPA filters saving you money and leading to less waste. We recommend changing HEPA filters based on use, usually every 4-6 months for normal use, and every 1-2 months per carbon filter, again with normal use. Those who put extra strain on the air in their homes, such as larger families, people with pets, and people who live in larger cities may want to change their filters more often. Most modern air purifiers come with a filter change indicator light that will let you know pretty accurately when you're due for a change. When changing your filters, dispose of dirty filters in the garbage. Reset filter indicator lights, and enable child lock if needed and available. Breathe Naturally firmly stands behind their filters and trusts them in their homes and the homes of their loved ones. We offer a 30-day money-back guarantee on all purchases. Satisfaction guaranteed or your money back. Our carbon filters are proudly made in the USA. All filters ship from Minnesota, a family-owned and operated company. Do not place the air purifier too close to your head, and refrain from having the air blow directly towards you. If you have any questions about GermGuardian air purifiers and replacement filters or any other questions please don't hesitate to drop us an email or give us a call. All of our contact information can be found in the About Us/Contact us section of the website.