The present invention relates to a device comprising at least one fluid reception chamber and at least one hydrophobic filter means, wherein a vertical through the hydrophobic filter means does not have a point of intersection with a fluid level of fluids present in the fluid reception chamber. It further relates to an external functional means as well as a treatment apparatus.本発明は、少なくとも1つの流体受容チャンバ(1)と少なくとも1つの疎水性フィルタ手段とを備える装置(100)に関し、疎水性フィルタ手段を貫通する垂直線は、流体受容チャンバ(1)内に存在する流体(5)の流体レベル(7)と交点を有さない。また、本発明は、外部機能手段および処理機器に関する。【選択図】 図1