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.
Determine the average number of words per page. Usually, this is about 400 for a standard academic book but only about 350 if the page size is Demy octavo. Changing the font, font size, leading, etc. will change this number a bit but, for your purposes, it is best to stick to these standard values.