When it is time to replace your IonGen probe, be sure to use the correct Aquascape replacement probe for your system to ensure proper functionality. The IonGen system effectively kills algae without the use of traditional liquid chemicals. As copper ions are added to the water, the probe is consumed, eventually needing to be replaced. The IonGen Probe for the G1.5 System is specially designed to fit the first generation PVC tee-style flow chamber and the second generation IonGen control panel, allowing for a tool-free probe installation and trouble-free use. The included 5' quick-connect cable makes installation simple and easy.