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Air filters with a MERV rating of 11 or higher need to be changed every three to six months. If your filters are incredibly strained because of environmental factors, such as living in a smoggy, pollen-rich area with a large household, you may need to change your filters every two months regardless of the MERV rating.

While a carbon filter can reduce particles in the air, it’s not intended to reduce moisture, and the filter will be less effective in a humid environment. To lower the humidity in your hydroponic set-up, you should opt for a dehumidifier instead of a filter.

Washing your carbon filter can damage the fibers and make it less effective. While removing the dust from the filter gently is possible, we don’t recommend you wash and reuse the filters once they have reached the end of their lifespan.

As a general rule, HVAC air filters should be replaced every one to three months (or every 90 days). However, the ideal frequency depends on several factors, including the filter type and your home's environment. For instance, if you use thinner filters (1-2 inches deep), have pets, have household members with allergies, smoke indoors, or frequently keep windows open, you may need to change the filter as often as once a month. It's best to follow the manufacturer's recommendation as a guideline and visually inspect the filter monthly to see if it's dirty. Regular filter changes are crucial for maintaining proper airflow, good indoor air quality, and efficient HVAC system operation.