If you have an air purifier, you should too. It usually needs to be changed when you hear the air cleaner getting louder than normal because it is clogging the filter. Lasts a decent amount of time depending on air quality. The price should be a bit lower, the filters aren't exactly cost effective for the number of replacements you need per year which is typically 2-3 times for $20 each. They do their job well, but the prices for filters are embarrassing.
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