For those on private well water, like my family, the situation can be even more problematic. Wells are often the source of water contaminated with modern agricultural products including fertilizers, glyphosate-based herbicides like Roundup and pesticides. It can also contain high levels of bacteria such as E-coli, can have excess calcium and magnesium contributing to hard water, rust that discolors laundry and bathrooms, and be very toxic with heavy metals such as arsenic, mercury and more.
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
Some furnaces come equipped with this filter, and there are various configurations. Find the manual and become familiar with it’s operation. You can pull out the filters and check them, make sure they are clean and in place. Hire a forced air heating specialist if you are unsure about how to operate / clean it and have them show you how it works.
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