Abstract: A filter assembly for allowing groundwater to flow through a hole in a seawall from a landward side of the seawall to a seaward side of the seawall includes a housing with a flange and a perforated shell. The filter assembly also includes a filter cartridge configured to be removably positioned inside the shell and a face plate positioned over the opening and removably connected to the seaward side of the flange thereby securing the filter cartridge inside the shell. The filter assembly also includes a valve member that is operable in an open state and in a closed state. The filter assembly also includes a deflection device connected to a seaward side of the face plate over the valve member. The deflection device is configured to prevent interference of the valve member.