To help put this into perspective, a hair from your head is about 60-75 microns in diameter. Particles under 35 microns are not visible to the naked eye. You can’t see most of the contaminants in the air. Pollen particles can range from 10 to 100 microns in size; dust from 0.5 to 5 microns; human dander, 10 microns or higher; etc. The majority of harmful particles are less than 5 microns in size.  Source
While Door to Door has many large followings, famously including college kids moving in and out of dorms, those of you on the east coast have not heard much of it. In fact, 17 states do not have a Door to Door location at all. Others might have a location or two within their state, but they are spread out and cater to a niche group. As a result, this might be a decent option for those in the Door to Door sweet spots, but it's not readily available to everyone in the way of their competitors.

Welcome to Unfiltered from #TeamFilterTime! The Unfiltered Series is an opportunity to sit down with top members of our organization and community to ask those burning questions we’re itching to know the answers to. In our first installment, we sat down with Blake Koch, founder and President of FilterTime, and former driver stock car driver in NASCAR’s Xfinity Series. The community has questions, and Blake has the answers.
Indeed, the company spends a significant bit of text explaining what makes their containers strong and durable. The storage containers are made of wood and prevent condensation, mold, and mildew and the cover resists weather, according to the website. It also touts the container's ability to fit into driveways and parking spaces and accommodate apartment and condo loading areas.
Washing your K&N washable air filter is as simple as removing your filter from its housing, spraying on K&N home air filter cleaner (part no. 99-6010), and rinsing with a low-pressure hose! After your filter is dry, simply reinstall to enjoy the benefits of K&N’s industry-leading washable filtration technology. See the full instructions included with your filter for details.

HEPA air filters have an efficiency rating of 17 to 20. However, most residential HVAC systems can't accommodate HEPA filters because they are too large or restrict airflow. Switching to HEPA filters will significantly improve your indoor air quality, but doing so will probably require calling a heating and cooling professional to retrofit your furnace.
While The Home Depot uses FPR, the industry standard is to use the air filter rating system of Minimum Efficiency Reporting Value (MERV). The MERV rating system helps you choose the filter right for you, with each rating dictating the effectiveness of a filter. The higher the MERV rating, the more efficient the filter, and the more a filter can catch harmful pollutants. 
The APEC Top-Tier 5-stage Water Filter System can be installed right under your sink, and it uses both reverse-osmosis and activated carbon to remove 99% of contaminants, including arsenic, chlorine, lead, chloride, heavy metals, bacteria, viruses, and more than 1,000 other common contaminants. Its long-lasting filters can be used on both tap and well water, and it features a leak-free quick connect fitting that makes it easy to install. With this water filter system in your kitchen, you'll feel like you were drinking bottled water all the time!
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