First, what I do; then, the question.
I tend to brew coffee one cup at a time. To avoid waste, I only brew as much as I need, so I usually drink it all. In order to further reduce waste, I have tried metallic net filters instead of paper filters, but they tend to allow an ultra fine silt to pass through, the presence of which at the bottom of the cup is annoying if the plan is to drink all the coffee. So, I started doing this: first I place a paper filter in the coffee maker, to collect the ultra fine silt, which is actually very small in volume, and inside the paper filter I place the metallic net filter to collect the actual coffee grounds, which are 99% of the volume. Then, I brew my coffee. When it is time to make more coffee, I only remove and wash the metallic net filter; the paper filter stays in its place, and gets reused about five times before it has collected so much ultra-fine silt that it is time to replace it.
Now, the question.
Do you see anything seriously wrong with this technique? Does it perhaps have any side effects that I should be aware of? Would such a practice be considered yucky by some? (If it is, then this is a cultural issue that perhaps I should be aware of.) Obviously, the coffee smells and tastes fine to me, but I have to wonder whether noses and palates that are more sensitive than mine think otherwise.
I know, it says "we prefer questions that can be answered, not just discussed", so if you have something to say, please just state it without starting a long discussion about it! C-:=