Pureflow® Self-Service Programs include the use of Pureflow® metallic replacement columns and ECS’ silver refining service. They may also include providing pump stations. Pureflow® columns are shipped to the your facility (or facilities) and you install them. Spent columns are shipped back to ECS for decanting and refining. A single, monthly settlement is made, which includes all charges and silver credits for the month. ECS can also track the usage of the columns, using information you provide, and recommend when the columns should be replaced.