элсэн шүүлтүүр
sand filter
фильтр песчаный
A treatment device or structure for removing solid or colloidal material of a type that cannot be removed by sedimentation. Such filters can be gravity rapid-rate or enclosed pressure type.
SourceЗураг
sand filter
фильтр песчаный
A treatment device or structure for removing solid or colloidal material of a type that cannot be removed by sedimentation. Such filters can be gravity rapid-rate or enclosed pressure type.
Source