The noun FILTRATION has 2 senses: 1. the process whereby fluids pass through a filter or a filtering medium. 2. the act of changing a fluid by passing it through a filter. Familiarity information: FILTRATION used as a noun is rare.
A sentence averages eleven words; an A4 / letter size sheet averages 32 to 35 sentences. A normal size sheet of paper with a standard layout, based on 80% - 90% coverage contains about 350 to 400 words.
This gives you 200 (large print), 500 for an academic book with 350 words per paperback page as a working average. To put these numbers in perspective, if you type with a font size of 10, you could be packing nearly 1000 words on each A4 page - which would make nearly 3 paperback pages.