Sorry guys
For the very bland answer but feeling very flat are a huge weekend on the beer.
But antman is on the money larger the % the bigger the gap better the flow rate. 0.01% is for solid granite and then it moves up the scale. If you still not sure let me know and i will do all the examples and how it works tomorrow but basically it is exactly as i said above.
Porosity is a measure of the void spaces
cheers
work over rig due this week, page-11
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