8p this past saturday this dude in his mid 20s came to my door selling something similar. he led on that he represented (was subbed for) the utility company. he kept insisting that he needed to see my water shutoff valve and he had something that would save me a lot of money (more money than i actually pay in water consumption!). i kept letting him talk just to shoot down his bullshit circle talking, it was more amusing for me to troll his nonsense and keep him in the cold while wasting both our times. definitely didn't let him in. interesting how others also agree this was bullshit, yet sad to know others fall for this.
Yes, yes, I am a broken record. I stress this in every portable storage container review because it is the best upside ever for someone like me who hates driving and is terrified of hauling my giant stuff in a giant truck all by myself. Door to Door offers the option of storing your stuff at a facility and picking it up yourself (or having movers do it) or letting Door to Door transport the items.
These filters can trap very small particles of dust, pollen, mold, and other irritants. Some of these filters work much like the air and oil filters in your car. They are made using pleated filter paper. Other filters are made with fine synthetic polyester fibers. Higher efficiency air filters can sometimes be coated with chemicals that can kill tiny microbes such as bacteria and mold. There are several advantages to using these higher efficiency air filters. Not only will your heating and cooling equipment perform better, your operating costs may well be lower. The air you breathe will be cleaner, as will your furniture and drapes. That $60 service call could have bought 10 filters that may have lasted through five cooling seasons!  Source
In my experience the powered electrostatic filters remove nearly everything from the air stream. The navy uses these on submarines to take the pollutants out of the air, in this usage we washed them monthly due to the amount of things they pull from the air. I have had a big Honeywell system on one house I have owned - it was the only house that never had a dust problem. The filter pulled everything from the air. Every 2 or 3 months I would run the cells through the dishwasher then give them a quick look for broken wires. An hour with the blower on and the power off drys them then back on with the power for another 3 months.
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.

Safe, clean drinking water is one of the most important health concerns for families. Even in the United States, it is possible to get municipal drinking water that still has contaminants and the current direction of the EPA isn't helping and even though the water may technically meet the minimum safety requirements of the federal government, many contaminants are never tested for.  At BestFilters.com, customers will find the water filters that they need to ensure they have safe and clean water. Drinking water can be contaminated from a number of sources and with our water infrastructure problems, the water that leaves the water treatment facility may not be the same water at your tap. Ask the folks in Flint MI.  Chemical pesticides and other ground water pollutants can seep into the municipal water supply and find their way into the homes of residents. Over time, this can lead to serious health problems and lower the quality of life. The water filters at BestFilters.com keep most of these contaminants away from homeowners. 
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