Patent ID: 8313649

Claim:
Method of starting a filtration plant for filtration of a process liquid, where the plant comprises supply equipment for the process liquid, filtration equipment and post-treatment equipment, where the filtration equipment is arranged for treatment of a flow of process liquid from the supply equipment and delivers a flow of filtered process liquid to the post-treatment equipment, and a secondary liquid supply unit which is connected to the post-treatment equipment, the method comprising: supplying of a flow of liquid from the secondary liquid supply unit to the post-treatment equipment, substantially draining a retentate side of the filtration equipment of liquid, supplying a flow of process liquid to the filtration equipment, and shutting-off the flow of liquid from the secondary liquid supply unit to the post-treatment equipment when a flow of filtered process liquid which fulfils predefined criteria, thereby indicating that the filtered process liquid is ready for post-treatment, has been achieved, and instead leading the flow of filtered process liquid to the post-treatment equipment.