noun, plural: filtrations. (1) The movement of water and solutes across the cell membrane due to hydrostatic pressure from the cardiovascular system. (2) The process of separating suspended particles from the fluid through a porous material in which the fluid can pass while the suspended particles are retained.
I think a good typing speed if you need to type a lot would be ideally 80 wpm and minimum 60 wpm. Anything lower than 60 and you'd struggle typing longer texts. I suggest you try TypeRacer - the global typing competition or simply practice touch typing on one of the free typing softwares.
1 Word Per Minute (WPM) is measured by calculating how many words (5 characters/keystrokes = 1 word) you can type in 1 minute.  Character Per Minute (CPM) calculates how many characters are typed per minute. Compare to WPM, CPM is more accurate and takes shorter time to measure.