Orenda Technologies ORE-50-124 15 gal SC1000 Scale & Metal Control Drum. SC-1000 Scale & Metal Control is a non-phosphonic acid based sequest that stops the contradiction of phosphate removal and other companies phosphate based sequests. When applied as directed, SC-1000 controls metal staining and carbonate scale while being fully compatible with the materials of pool & spa construction and other treatment chemicals. SC-1000's formulation was awarded the Environmental Protection Agencys Presidential Green Chemistry Award for its implementation of environment-friendly chemical technology.