Sigma Pool Systems   The Sigma III Pool/Spa Ionic Purifier The Sigma III Pool Conditioner Sigma Pool Systems Commercial/Municipal Applications The Sigma III Control Unit The Sigma III control unit is the brains of the Sigma III System. It was developed by the Sigma engineers to provide you with ease and efficiency of operation. The Sigma III control unit allows you to control the amount of copper and silver that are added into your pool. Very "user friendly" and easy to use, the Sigma III control unit was designed for use by those with limited experience in pool/spa care. The Sigma III Flow Cell The Sigma III Flow Cell is the backbone of the Sigma III Pool/Spa System. The flow cell is installed in your pool pump circulation line and recieves a low electrical current from the Sigma III Control Unit. This causes the Flow cell to release precisely controlled amounts of copper and silver into your pool or spa water. After over 1000 hours of research at the University of Arizona microbiology laboratories, research has determined the safest ratios of copper to silver needed to provide the best results. The copper and silver electrodes are self sacrificing and tend to last 2 to 3 years (depending on pool size and use) before they need to be changed. To learn more about copper and silver and their effectiveness in controlling bacteria and algae, please visit our "In the News" section. The Sigma III Pool System This is what the Sigma III System looks like installed into a pre-existant pool pump circulation system. The Flow Cell is inserted between the pump and the filter, and the Control Box is mounted somewhere nearby. And being connected to the pump's electrical timer, the Sigma turns on automatically whenever your pump is on.