By water filters, I mean the ones you put in a jug from brands like Brita.
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It depends on the water you have. Really, how full of dissolved minerals and metals are in the water.
The more minerals in the water, the faster the filter will fill and eventually become clogged and unable to filter.
It also depends on the size of the filter as well, the smaller it is the quicker it fills, the bigger it is, the longer it takes.
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