Pompeyexile Most of the claims look reasonable enough, apart from: “so although a paper filter retains all the coffee grounds it also retains all the brewing colloids (flavour carriers in the coffee)”, “full development of the coffee flavour” & “optimum time of infusion thanks to the precise openings of the filter foil”.
Paper filters do affect coffee taste, different brands produce different results, but you get plenty of clean flavour with a good one, brewing colloids do not carry the coffee flavour, the flavours predominantly dissolve & pass through the paper as the paper catches the bits, not the solution.
Full development of coffee flavour only happens if you have the grind size dialed in to brew size & pour rate, whether metal, or paper filter. The solids that pass through a metal filter don’t really contribute anything more to the flavour.
Again, the optimum time of infusion, for drip (should say ‘percolation’), is determined by grind size…though the filter medium does have a knock-on effect on that (you need to grind coarser for coarser filtration pores).
I mostly used mine in conjunction with a paper filter in a Clever, the metal filter speeds up draw down, but the paper filter prevents a very silty drink.
