A filter by using filter membrane making contamination, which is larger than the spots could not be inserted. There is only pure water only.Samart suem.
It is filtered by membrane filtration of contaminants which are larger than can not insert slip through. There will be only pure water that can ooze through.
A filter using the membrane filter made of contaminants which are larger than can be inserted to sneak through. Only the pure water only.Can tourism through.