Rio Rid-Volt Titanium Grounding ProbeRID VOLT gives you a positive electrical ground for your aquatic system. When properly installed, "stray voltage" which is generated by pumps, heater, lights, and other electrical devices used by aquariums will be carried away. RID VOLT protects you and removes unwanted stress from your aquarium's inhabitants. Made of pure titanium, RID VOLT provides: excellent electrical contact with the water, a non toxic environment for animal and plant species,