Fibrous and slime algae can ruin pond clarity and inhibit plant growth. A new solution to this problem is the T-Flow control system from VELDA. Using Electric pulses between a copper anode and stainless steel cathode, copper ions are released. It is these ions that eliminate slime algae quickly and effortlessly WITHOUT THE NEED OF CHEMICALS. During the winter months the T-FLOW's built-in thermometer shuts down the system automatically. T-FLOW-15: 3000-15000 litres PLEASE NOTE THE T-FLOW SYSTEM SHOULD NOT BE USED WITH PONDS THAT HAVE SALT ADDED TO THEM.