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While you can run your HVAC system without an air filter, it isn’t something professionals recommend—especially not for an extended period. It can reduce indoor air quality, clog air ducts, and strain your system. This can lead to performance issues, higher energy bills, costly repairs, and a reduction in the system's lifespan.

According to the Centers for Disease Control and Prevention (CDC), no single water filter or treatment system can remove 100% of contaminants. To find the best filter for your needs, first determine which impurities are most important for you to remove. For example, reverse osmosis (RO) filters are highly effective at removing a wide range of contaminants, including sediment, heavy metals, bacteria, viruses, dissolved salts, and chemicals. However, the RO process can also filter out beneficial minerals like calcium and magnesium. If eliminating bacteria is your main priority, a UV filter could be a suitable choice. Additionally, distilled water is considered the most pure form of filtered water available.

For washable or electrostatic air conditioner filters, you can soak and rinse them with water. If you rinse the filter with water, make sure to use a faucet, shower head, or garden hose with a gentle water pressure setting, as strong water pressure could damage the filter.

But for disposable filters, water could ruin the filter, even allowing mold to grow in the filter. Instead, these filters should be replaced.

The lifespan of a whole-house air purifier or filtration system depends on several factors, but with proper maintenance, they are built to last. A whole-house system that integrates with your home's ductwork can last 10 to 15 years, or even for the entire lifetime of your existing HVAC system. To maximize the unit's lifespan, perform regular cleanings, change filters as recommended, and schedule an annual inspection to catch potential issues early. The system's longevity also depends on its frequency of use and how hard it must work to maintain your desired air quality. For comparison, smaller, portable air filter systems typically last between five and ten years.