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
Air and Water Filters in your house benefit at least two aspects of your life; Health and Cleanliness.     Every house is different, so it’s important that you find out what you’ve got.   Filters can range from a complicated assembly to a simple screen.   When changing a filter, record the date it was changed, and where possible write the date on the filter itself.
Breathe in cleaner air with this Blueair Classic 500 and 600 Series DualProtection filter. The HEPASilent technology eliminates pet dander, mold spores and other various pollutants quickly, while the DualProtection filters remove chemicals such as traffic exhaust, smog and smoke. This Blueair Classic 500 and 600 Series DualProtection filter uses coconut carbon, getting rid of pollutants without the use of chemical additives.
Ensuring that your filter fits properly in your HVAC system means making sure that you have not only the right length and width, but also thickness of your filter. Most standard air filters are 1 - 2 inches in thickness. Whereas media filters are typically 3 to 5 inches in thickness. The best way to measure your air filter size is to get out the measuring tape and measure it directly.
The locations are limited and the age of the containers and fleet is not clear. "Some containers are new and some are older," says a customer service representative of the containers, who refrained from answering about the fleet age. But the company is operating a little more than 20 years and markets itself as constantly updating its offerings. I would imagine that includes the trucks and even the forklifts and not just the containers.
Most of us, whether we choose to acknowledge it or not, are consuming water that contains the residue of treated sewage, industrial waste, agricultural chemicals, pharmaceuticals, heavy metals, fluoride, disinfectants and their byproducts, as well as storm runoff. Growing awareness of the problem is why more consumers are seeking whole house water filter options. 

You remove the good bacteria colony every time you replace the cartridge. It will always grow back, but it takes time. HOB filters have multiple cleaning steps, so they do take a little more maintenance than some other types of filters (like sponge filters, for example). And one of the most common complaints about HOB filters is the noise (They have gotten much quieter over the years, there’s still hope!).
Similar to fiberglass filters, disposable pleated polyester filters have a sizable surface field and a rating of 5 to 13. The pleats increase the surface area and make the furnace filters more efficient at capturing airborne particles. A pleated air filter with a medium efficiency rating can filter small to large particles. Filters with a rating of 7 to 13 provide a level of effectiveness compatible with absolute high-efficiency particulate air (HEPA) filters, but at a lower price point.

Breathe in cleaner air with this Blueair Classic 500 and 600 Series DualProtection filter. The HEPASilent technology eliminates pet dander, mold spores and other various pollutants quickly, while the DualProtection filters remove chemicals such as traffic exhaust, smog and smoke. This Blueair Classic 500 and 600 Series DualProtection filter uses coconut carbon, getting rid of pollutants without the use of chemical additives.
All you have to do is screw this water filter system on to your kitchen faucet—there are no tools required! The PUR Filter well then remove more than 70 contaminants from your water, including 99% of lead, plus chlorine, mercury, and pesticides. Each filter can be used on up to 100 gallons of water, so the manufacturer recommends replacing the filter every 2 to 3 months. Reviewers say that the unit is sturdy, easy to install, and doesn't leak, providing fresh, clean water every time they turn on the faucet.
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