This is a phase II double blind multicenter randomized placebo-controled clinical study aimed to find out whether treatment with Filtrum-STI (orally administered 0,4g tablets) is safe and effective in children with viral gastroenteritis. Filtrum-STI (lignin hydrolytic) is a drug with a high absorbing ability, that binds and eliminates toxins, pathogenic microorganisms and viruses. Filtrum-STI is inoffensive for mucous membranes, enhances colonic propulsion and improves its natural microflora. The drug is not toxic and well combines with other medication