IPA: /nɒnˈfɪltərəbəl/
KK: /nɑnˈfɪltərəbəl/
This word describes something that cannot be filtered or separated through a filter.
The nonfilterable substances in the mixture caused problems during the experiment.
Nonfilterable → It is formed from "non-" (meaning not) and "filter" (from Latin "filtrare", meaning to strain or pass through) and the suffix "-able" (meaning capable of). The word "nonfilterable" means not capable of being filtered or strained.
Think of 'not' ('non-') being applied to something that 'passes through' ('filter') — that's why nonfilterable means it cannot be passed through a filter.