The term 'filter through' can be broken down into three separate words: INFILTRATE (10 letters), SIFT (4 letters), and SEEP (4 letters). INFILTRATE means to enter or penetrate a place or organization secretly and subtly. SIFT means to examine something carefully in order to separate the useful parts from the useless parts. SEEP means to slowly pass through a porous material or surface. Together, these three words can be used to describe the process of filtering through something, which is the act of passing something through a filter or other device to remove impurities or unwanted elements.