The black particles are parts of one of BRITA's filter media, the activated carbon. The granulated activated carbon is made of coconut shells. Like each natural product, coconut shells are subject to natural variances regarding product quality. This can lead to abrasion of parts of the carbon into your filtered water. To eradicate any carbon dust which may be present, preparation of your cartridge is crucial.
Please prepare as per your cartridge instructions or see "How to prepare your cartridge".
Please be assured that the contents of the cartridge are food grade and completely harmless to yourself and if accidentally consumed will be harmless to health. Their presence will not affect the performance of the cartridge.
If there are still dust or particles present after this initial preparation, then we would suggest that the cartridge is removed from the system and re-prepared by:
MAXTRA, Classic & Multifit cartridges:
Vigorously shaking under water, then re-install and flush through with two litres of water.
Inline, P 1000 & A 1000 cartridges:
Flush a futher two litres of water through the cartridge.