A percolation type filtering device comprising: an outer casing ; a funnel-like dividing element which is for storing the water to be filtered and which is received in the outer casing which defines a reservoir therebelow for storing the filtered water, the funnel-like dividing element being capable of defining a flow path of the water to be filtered; a seat which is formed in the funnel-like dividing element in the region of the flow path in order to receive in a removable manner a first filtering element , the first filtering element comprising a replaceable cartridge type filter ; a discharge opening which is for the filtered water from the first filtering element and which is formed in the seat and which is capable of receiving in a removable manner a second filtering element , wherein a connection portion is defined in the seat , in the region of which the cartridge type filter is connected in a sealing manner in the seat ; a ventilation opening which places in communication the seat with the outer side of the outer casing ; wherein the ventilation opening opens in the seat in a downstream direction along the discharge path with respect to the connection portion and wherein the funnel-like dividing element comprises a first perimeter wall and a second perimeter wall , between which there is defined a space which defines an expansion of the ventilation opening , characterized in that the space extends in a vertical direction substantially as far as an upper portion of the outer casing and in that the funnel-like dividing element defines a reservoir which is intended for the storage of water to be filtered, the reservoir being entirely superimposed on the seat , the discharge opening comprising a connection element for a removable connection with respect to the second filtering element . an outer casing ; a funnel-like dividing element which is for storing the water to be filtered and which is received in the outer casing which defines a reservoir therebelow for storing the filtered water, the funnel-like dividing element being capable of defining a flow path of the water to be filtered; a seat which is formed in the funnel-like dividing element in the region of the flow path in order to receive in a removable manner a first filtering element , the first filtering element comprising a replaceable cartridge type filter ; a discharge opening which is for the filtered water from the first filtering element and which is formed in the seat and which is capable of receiving in a removable manner a second filtering element , wherein a connection portion is defined in the seat , in the region of which the cartridge type filter is connected in a sealing manner in the seat ; a ventilation opening which places in communication the seat with the outer side of the outer casing ; wherein the ventilation opening opens in the seat in a downstream direction along the discharge path with respect to the connection portion and wherein the funnel-like dividing element comprises a first perimeter wall and a second perimeter wall , between which there is defined a space which defines an expansion of the ventilation opening , characterized in that the space extends in a vertical direction substantially as far as an upper portion of the outer casing and in that the funnel-like dividing element defines a reservoir which is intended for the storage of water to be filtered, the reservoir being entirely superimposed on the seat , the discharge opening comprising a connection element for a removable connection with respect to the second filtering element . <EOS>