Change Filter Once every 1 to 3 months
It all depends on the quality of your tap water.
Some areas are cleaner the others, if you’re on of the fortunate people with clean tap water, the filter can last several months.
But if you live in an older house or building, or get water from a well, or in an old part of the city, then you might need to change your filters more frequently.
Usually, when your filter starts to lose water pressure or turn dark, it's a good time to replace it.