electropositive asbestos-cellulose filters efficiently adsorbed poliovirus from tap water without added multivalent cation salts between ph 3.5 and 9.0 , and the absorbed viruses could be eluted with 3 % beef extract , ph 9 , but not with ph 9.5 to 11.5 glycine-naoh .
C0206435
poliovirus
C0042776
viruses