Įdomus daiktas tas tikėjimas. Svarbu filtruot, o ar reliai veikia tai neaišku, jei tiki - vadinasi veikia. Galima ir pro mano triusikus filtruot - jei tkėsi, kad išvalo bakterijas - gali gert. (čia apie tokius vatos/kiminų ir anglies filtrus)
Apie tuos medienos filtrus siūlau originalų straipsnį paskaityt, tikrai įdomus apie filtravimą:
http://www.plosone.org/article/info%3Ad ... ne.0089934Jie naudojo spygliuočių medieną, konkrečiai Pinus strobus (Veimutinė pušis - nieko čia nenusimanau). Bakterijas, konkrečiau E. coli, išfiltruoja >99,9%. Kitų medžių vandens indai skiriasi, tad neaišku ar tinka, o jei tinka, tai kokio ilgio reikia filtrą gamint. Jei pvz. beržas "filtruos" greitai, tai greičiausiai jis tiesiog nieko nesulaikys, o viską praleis - t.y. efekto - 0.
"Remarkably, it was observed that 20 nm gold colloids could not pass through inter-vessel pit membranes of
some deciduous tree species [10], indicating an adequate size rejection to remove viruses from water. Furthermore, inter-tracheid pit membranes were found to exclude particles in the 200 nm range [8], as required for removal of bacteria and protozoa."
"Since
angiosperms (flowering plants, including hardwood trees) have larger xylem vessels that are more effective at conducting sap, xylem tissue constitutes a smaller fraction of the cross-section area of their trunks or branches, which is not ideal in the context of filtration.
The long length of their xylem vessels also implies that a large thickness (centimeters to meters) of xylem tissue will be required to achieve any filtration effect at all – filters that are thinner than the average vessel length will just allow water to flow through the vessels without filtering it through pit membranes"