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.
In practice you need to subtract 15-20% from the page word total once the white space is taken into account. 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.