Abstract: A sealing arrangement is provided for a shaft rotatably mounted in a housing which is operable in an abrasive media such as sandy sea water or the like. The sealing arrangement includes a main seal and an auxiliary seal fitted around the shaft with a chamber formed between these seals for accommodating a separating medium. The chamber includes a feed opening and supply arrangement for continuously communicating pressurized separating medium, such as air or clean water to said chamber. An outlet opening is provided at the bottom of the chamber for accommodating exhaust of abrasive media which may accumulate in the chamber during non-operating conditions. The separating medium supply and exhaust, as well as the configuration of the auxiliary seal is such as to assure continuous escape of a portion of the separating medium through the auxiliary seal during operation, thereby preventing ingress of the surrounding abrasive medium into the chamber during operations via the auxiliary seal.