Yes. This involves either holding the filter under a faucet or installing the filter and allowing it to filter several batches of water, depending on the filter you own) before you can use it.
Here are the flush requirements for the different Brita water filters available today.
Brita Elite Filters No Initial Flush Needed To use a Brita Elite filter, insert it directly into the pitcher, filter and discard three batches of water,
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