an instrumentality invented for a particular purpose

remove by passing through a filter

remove by passing through a filter

a filter that removes dust from the air that passes through it

layer of sand or gravel used to expose sewage effluent to air and the action of microorganisms

filter (usually of paper) that passes the coffee and retains the coffee grounds

a filter in a sink drain; traps debris but passes water

filter consisting of a layer of sand or gravel for filtering water